Specification for rotating electrical machines of particular types or for particular applications BS5000. Part 11

BS 5000-11: 1973

BRITISH STANDARD CONFIRMED AUGUST 1984

Specification for

Rotating electrical machines of particular types or for particular applications — Part 11: Small-power electric motors and generators

UDC 621.313 – 13:621.313.1.026.443

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Incorporating Amendment Nos. 1, 2 and 3

BS 5000-11:1973

Co-operating organizations The Electrical Industry Standards Committee, under whose supervision this British Standard was prepared, consists of representatives from the following Government departments and scientific and industrial organizations: Associated Offices Technical Committee

Department of Trade and Industry

Association of Consulting Engineers*

Electric Cable Makers’ Confederation

Association of Manufacturers of Domestic

Electrical Contractors’ Association

Electrical Appliances

(Incorporated)*

Association of Mining Electrical

Electrical Contractors’ Association of Scotland

and Mechanical Engineers

Electrical Research Association*

Association of Supervisory and Executive Engineers*

Electricity Council, the Central Electricity Generating Board and the Area Boards in

British Electrical and Allied Manufacturers’ Association

England and Wales* Electronic Engineering Association

British Electrotechnical Approvals Board for Household Equipment

Engineering Equipment Users’ Association* Institution of Electrical Engineers

British Radio Equipment Manufacturers’

Institution of Electrical and Electronics

Association

Technician Engineers

British Railways Board*

Lighting Industry Federation Limited

British Steel Corporation

Ministry of Defence

Crown Agents for Oversea Governments and

National Physical Laboratory (Department of

Administrations

Trade and Industry)

Department of Employment (HM factory

Oil Companies Materials Association*

Inspectorate)

Post Office

Department of the Environment*

South of Scotland Electricity Board*

The Government department and scientific and industrial organizations marked with an asterisk in the above list, together with the following, were directly represented on the committee entrusted with the preparation of this British Standard. Association of Electrical Machinery Trades

Ministry of Defence (Army Department)

Engineer Surveyors’ Association

Ministry of Defence (Navy Department)

Lloyd’s Register of Shipping

Machine Tool Trades Association

London Transport Executive

Rotating Electrical Machines Association

This British Standard, having been approved by the Electrical Industry Standards Committee, was published under the authority of the Executive Board on 13 November 1973 © BSI 04-2000 First published as BS 170 June 1921 First revision June 1939 Second revision July 1962 Third revision as BS 5000-11 November 1973 The following BSI references relate to the work on this standard: Committee reference ELE/1/13 Draft for comment 71/27730

Amendments issued since publication Amd. No.

Date of issue

2280

May 1977

2717

August 1978

5634

July 1988

Comments

Indicated by a sideline in the margin

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Contents Page Co-operating organizations Inside front cover Foreword iii 1 Scope 1 Section 1. Construction and electrical performance 2 Definitions 1 3 General 1 4 Ratings 2 5 General conditions 2 6 Limits of temperature rise and methods of temperature measurement 3 7 Momentary overloads 6 8 Commutators, brush gear and slip rings 6 9 Full load efficiency 7 10 Power factor 7 11 Tests 7 12 Application of tests 7 13 Temperature rise tests 7 14 Torque tests 8 15 Commutation tests 8 16 High voltage tests 8 17 Test certificates 8 18 Tolerances on characteristics of machines 8 19 Terminal and lead markings 8 20 Radio interference 8 21 Information to be given on the machine 9 22 Ratings of capacitors 9 Section 2. Metric dimensions 23 Frame designation 9 24 Letter symbols 10 25 Dimensions, tolerances and limits 10 26 Access for flange-fitting bolts 10 27 Electrical connections 10 Appendix A Notes on the torque characteristics and application of induction motors 15 Appendix B Information to be given with enquiry and order 16 Appendix C Terms and definitions 17 Figure 1 — Symbols for dimensions of foot-mounted machines without flanges 12 Figure 2 — Symbols for dimensions of flange-mounted machines and foot-mounted machines provided with a flange 12 Table 1 — Limit of permissible temperature rise in °C 5 Table 2 — Momentary overload for motors 6 Table 3 — Test voltages 8 Table 4 — Tolerances 9 Table 5 — Torque characteristics 15 Table 6 — Suffix letters 10 Table 7 — Letter symbols to indicate dimensions 11

i

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Page Table 8 — Standard dimensions for foot-mounted or resilient base-mounted machines 13 Table 9 — Standard dimensions for flange-mounted machines 14 Publications referred to Inside back cover

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Foreword This British Standard revises and supersedes the 1962 edition of BS 170 and gives (optional) metric dimensions for small-power machines, corresponding approximately to the inch dimensions given in BS 2048-1:1961. It is primarily intended to cover light type single-phase electric motors but may also be used for 3-phase or d.c. machines, particularly where mechanical interchangeability of machines suitable for different supplies is of importance. This standard forms a Part of BS 5000 that, together with BS 4999, will eventually contain a comprehensive series of British Standards for rotating electrical machines. A list of the contents of BS 5000 showing all the Parts envisaged in the foreseeable future is given in the “General Introduction and Index”, which will be brought up to date as new Parts are published. The contents of BS 4999 are given in Part 0 of that standard. A British Standard does not purport to include all the necessary provisions of a contract. Users of British Standards are responsible for their correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations.

Summary of pages This document comprises a front cover, an inside front cover, pages i to iv, pages 1 to 18, an inside back cover and a back cover. This standard has been updated (see copyright date) and may have had amendments incorporated. This will be indicated in the amendment table on the inside front cover. --`,``-`-`,,`,,`,`,,`---

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BS 5000-11:1973

1 Scope

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Section 1 of this British Standard specifies the performance of a.c., d.c. and universal rotating electrical machines of any continuous rated output up to and including 0.75 kW or kVA per 1 000 rev/min (synchronous speed for induction machines), and rated voltages up to 250 V d.c. or single-phase a.c., and up to 650 V three-phase a.c. It also applies to short-time rated machines having an equivalent continuous rating to the above. It is primarily intended to cover light type single-phase electric motors but may also be used for three-phase of d.c. machines, particularly where mechanical interchangeability of machines suitable for different supplies is of importance. Section 2 specifies a range of metric dimensions affecting interchangeability. These dimensions are optional whereas the requirements of section 1 are mandatory. It is therefore important when enquiring or ordering to state whether the machine is to comply with the dimensional requirements of section 2 in addition to the constructional and electrical performance requirements of section 1. It is primarily intended to cover light type single-phase electric motors but may also be used for three-phase or d.c. machines, particularly where mechanical interchangeability of machines suitable for different supplies is of importance. NOTE 1 It is recognized that in practice there is some overlap between this standard and BS 5000-10 or BS 5000-99 and that therefore certain ratings of machines may be constructed to comply with either one or the other but not necessarily with both. NOTE 2 The titles of the publications referred to are listed on the inside back cover.

series commutator 2) Polyphase a.c. machines cage induction 3) D.C. machines compound shunt series separately excited 4) A.C./D.C. machines universal series commutator 3.2 Degrees of protection by enclosure Types of protective enclosure selected from BS 4999-105 are: (IP 00) (IP 20) (IP 22) (IP 44) (IP 45) (IPW 44) (IP 58) (BS 4683) a

For some types of totally enclosed machine it may be necessary for Category IP 54 to be used.

3.3 Methods of cooling Methods of cooling selected from BS 4999-106 are: IC 00 IC 01 IC 00 41 IC 01 41 IC 08 IC 08 41

Section 1. Construction and electrical performance 2 Definitions For the purposes of this British Standard the definitions given in Appendix C apply.

free convection self ventilated totally enclosed free convection totally enclosed fan ventilated drip proof, air over motora totally enclosed, air over motora

a Such

machines are used for driving fans, the air from which is drawn over the frame, thus cooling it.

3 General

3.4 Dimensions

3.1 Types of machine The principal types of machine covered by this standard are: 1) Single-phase a.c. machines split-phase capacitor start, induction run capacitor start, capacitor run (two value capacitor) capacitor start and run (single value capacitor permanently in circuit) shaded pole

A machine complying with the requirements of this specification is not restricted as to dimensions. If, however, one of the standard frame sizes specified in clauses 23 to 27 is quoted on the nameplate then the machine shall comply with all the dimensional requirements of those clauses for the particular size of machine and method of mounting. 3.5 Information to be given with enquiry and order The information to be supplied by the purchaser with his enquiry or order is given in Appendix B.

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BS 5000-11:1973

4 Ratings 4.1 General The assignment of rating shall be made by the manufacturer to indicate the capabilities of the machine and marked on the rating plate 1) in accordance with Clause 21. Since electrical machines have a time-rate of temperature rise, and since the rise of temperature in accordance with this standard is limited, a qualifying term shall be included in the rating to give an indication of the duration for which the machine may run at the assigned values while complying with this standard. Where a machine is manufactured for general purposes, it shall be capable of supplying its rating indefinitely and the qualifying terms shall signify this. 4.2 Classes of rating In assigning the rating, the manufacturer shall select one of the following rating classes: 1) Continuous rating (CR): A statement of the load and conditions, assigned to the machines by the manufacturer, at which the machine may be operated for an unlimited period while complying with the requirements of this standard. 2) Short-time rating (STR): A statement of the load time and conditions, assigned to the machine by the manufacturer, at which the machine may be operated for a limited period, starting at the ambient temperature, while complying with the requirements of this standard. The preferred times for short-time ratings are 5, 10, 15, 30 and 60 minutes. The value of short-time shall be marked on the rating plate.

4.4.2 Variable-speed motors. For variable-speed motors, definite ratings shall be assigned for the highest and lowest speed of the range specified. If ratings at intermediate speeds are important they shall be specified. 4.5 Voltage ratings 4.5.1 Rated voltage. The rated voltage is the voltage between the line terminals of the machine at rated output. 4.5.2 Generators rated for specified operation over a limited range of voltage. The requirements for a.c. and d.c. generators are described separately below. 4.5.2.1 D.C. generators. For d.c. generators rated to run over a limited range3) of voltage the rated output and current shall relate to the highest voltage of the range, unless otherwise specified. 4.5.2.2 A.C. generators. For a.c. generators rated to operate over a limited range3) of voltage the rated output and power factor shall relate to any voltage within the range unless otherwise specified. 4.5.3 Motors rated for specified operation over a limited range of voltage. The requirements for a.c. and d.c. motors are specified separately below. 4.5.3.1 D.C. motors. For d.c. motors rated to operate over a limited range3) of voltage, the rated output shall relate to the mean voltage of the range unless otherwise specified. 4.5.3.2 A.C. motors. For a.c. motors rated to operate over a limited range3) of voltage, the rated output shall relate to the mean voltage in the range.

5 General conditions

4.3 Output ratings

5.1 Preferred voltages

4.3.1 D.C. generators. The rated output of d.c. generators shall be expressed in watts (W)2). 4.3.2 A.C. generators. The rated output of a.c. generators shall be either the apparent electric power expressed in volt amperes (VA)2) together with the power factor; or the real power expressed in watts (W)2). 4.3.3 Motors. The rated output available at the motor shaft shall be expressed in watts (W)2).

The preferred voltages are:

4.4 Motors for multiple ratings 4.4.1 Multi-speed motors. For multi-speed motors, a definite rating shall be assigned for each speed.

for d.c. machines for a.c. machines single-phase polyphase

100–250 V 240 V 415 V

5.2 Preferred frequency The preferred frequency for alternating current machines is 50 Hz.

1)

When the motors are used for driving fans and are mounted in the air-stream, the output rating should be agreed between the manufacturer and the purchaser. The letter symbols A.O.M. (air over motor) should be added to the rating referred to on the rating plate. 2)

Large outputs may be expressed in kW or kVA.

3)

A limited voltage range is to be understood as being a range (maximum minus minimum) of the order of 10 % of the mean voltage.

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BS 5000-11:1973

5.3 Preferred number of phases for alternating current machines

6 Limits of temperature rise and methods of temperature measurement

The preferred number of phases for alternating current machines is either one or three.

6.1 Limits of temperature rise

5.4 Machines for non-preferred voltages, frequency and number of phases Machines for use on systems employing voltages, frequencies and phases other than those specified in 5.1, 5.2 and 5.3, but which comply in all other respects with the requirements of this standard, come within the scope of this standard. 5.5 Waveform (a.c. machines) The voltage waveform of an a.c. generator shall be virtually sinusoidal. NOTE Where the waveform is of importance the deviation from a true sine wave and the load at which this should occur should be the subject of agreement between the manufacturer and the purchaser.

A.C. motors shall be capable of working on a supply having a waveform which is virtually sinusoidal. NOTE Where the waveform is not sinusoidal (e.g. where a motor in fed from a static inverter) the performance of the motor should be the subject of agreement between the manufacturer and the purchaser.

5.6 Preferred outputs The preferred outputs in W for all types of motors are: 2.5, 4, 6, 10, 16, 25, 40, 60, 80, 90, 100, 120, 180, 250, 370, 550, 750, 1 100. 1 500 and 2 200. NOTE

Large outputs can be expressed in kW.

5.7 Preferred speeds The preferred speeds are approximately 950, 1 425 and 2 850 rev/min except for universal and series commutators and series d.c. machines. --`,``-`-`,,`,,`,`,,`---

NOTE In the case of induction machines the preferred speeds given above refer to machines designed to operate from a 50 Hz a.c. supply. The speeds are intended to be approximate only and those given on the rating plate of individual machine may differ somewhat from those given above. It should be noted that shaded pole motors normally run somewhat slower than the above speeds. To obtain the best characteristics for a.c./d.c. motors for general purposes the full load speed should preferably be not less than 6 000 rev/min.

The limits of temperature rise4) of machines, as specified in Table 1 for different classes of insulation, are based on a cooling air temperature of 40 °C at an altitude not exceeding 1 000 metres. This condition is standard, and where other conditions of cooling air temperature and/or altitude apply the adjustments to the limits of temperature rise specified in Table 1 shall be made in accordance with 6.3 and 6.4. The temperature rise4) of continuously rated motors when tested at rated voltage, or at the mean of the voltage range, under rated conditions, and in accordance with the requirements of this standard, shall not exceed the limits specified in Table 1 or, where applicable, the adjusted limits. Motors shall, however, be capable of operating without injurious heating over a range of voltages exceeding ± 6 % of either the rated voltage or the extremes of the rated voltage range. For machines having a short-time rating, the limits specified in Table 1 or, where applicable, the adjusted limits, may by agreement be increased by 10 °C. Where such an agreement is made to increase the limits, the increased limits shall be indicated on the rating plate. Where the windings and the commutators (or slip rings) to which they are connected are insulated with different classes of insulating material, the temperature rise associated with the lower class shall apply to the commutator (or slip rings). NOTE If the duty includes lengthy periods on light-load or no-load, the advice of the manufacturer should be sought at the time of enquiry or order. This applies particularly to capacitor-start-and-run motors.

6.2 Methods of temperature measurement 6.2.1 Resistance method. When using the resistance method (the preferred method of temperature measurement for windings) the temperature rise of the winding shall be determined by the increase in the resistance of the winding. Since the resistance of copper over the range of temperature referred to in this standard varies in direct proportion to the temperature above minus 235 °C, the hot temperature for copper windings is obtained from the following formula: t2 = (R2/R1) (t1 + 235) 235

4)

Temperature rise = maximum temperature recorded minus temperature of the cooling air at the time of the maximum machine temperature.

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where R2 is the resistance of windings hot (7) R1 is the resistance of windings cold (7) t2 is the temperature of windings hot (°C) t1 is the temperature of windings cold (°C) NOTE For materials other than copper replace 235 in the above formula by the reciprocal (to the nearest whole number) of the temperature coefficient of resistance at 0 °C for the material.

Where it is not possible for readings R2 to be taken within 20 seconds of shut-down, then four readings shall be taken at 15 second intervals as soon as is practicable after shut-down of the heat run, and a curve plotted back to zero time. 6.2.2 Thermometer method. When using the thermometer method, the temperature shall be measured by thermometers, suitable lagged, applied to the hottest accessible surfaces of stationary parts during the test period and by these and other thermometers applied to the accessible surfaces of rotating and other parts following the stopping of the machines after test5). The term “thermometers” means mercury or alcohol bulb thermometers but, at the option of the manufacturer, may also include thermocouples and resistance thermometers when applied to surfaces accessible to bulb thermometers. NOTE Measurements by both the thermometer method and the resistance method are not required to be taken and the figures of temperature rise given in Table 1 for the thermometer method and the resistance method should not be used as a check against one another.

6.3 Corrections of temperature rise for variations in cooling air temperature NOTE This subclause applies to all machines in which no medium other than air is used for cooling or heat removal.

6.3.2 When a machine is specified to operate with a cooling air temperature always less than 40 °C but not less than 30 °C, the permissible temperature rise shall be increased above the value given in Table 1 by an amount by which the specified cooling air temperature6) is less than 40 °C. The permissible adjustment shall be taken to the nearest whole celsius degree. 6.3.3 When a machine is specified to operate with a cooling air temperature exceeding 40 °C but not exceeding 100 °C, the permissible temperature rise shall be reduced below the value given in Table 1 by an amount by which the specified cooling air temperature exceeds 40 °C. The permissible adjustment shall be taken to the nearest whole celsius degree. 6.3.4 When a machine is specified to operate with a cooling air temperature greater that 100 °C, the permissible temperature rise shall be agreed between the manufacturer and the purchaser. Tests of temperature rise may be carried out at any convenient cooling air temperature. When the temperature of the cooling air during test is lower than the stated site cooling air temperature by 30 °C or less, no correction shall be made on account of such difference. When the temperature of the cooling air during test is lower than the stated site cooling air temperature by more than 30 °C, the permissible temperature rise on test shall be the permissible temperature rise under the specified site conditions reduced by a percentage numerically equal to one-fifth of the difference between the specified temperature of the cooling air on site and the temperature of the cooling air on test where both temperatures are expressed in °C.

6.3.1 When a machine is specified to operate with a cooling air temperature always less than 30 °C, the permissible temperature rise shall be increased above the value given in Table 1 by 10 °C unless otherwise agreed.

5)

The maximum temperature may occur after the machine has stopped.

6)

On preference, such cooling air temperatures should be specified to the nearest 5 °C, e.g. 35, 40, 45, etc. --`,``-`-`,,`,,`,`,,`---

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Table 1 — Limit of permissible temperature rise in °C Based on cooling air temperature not exceeding 40 °C and at an altitude not exceeding 1 000 metres Type of enclosure (see 3.2 and 3.3)

Item no.

Part of machine

Method of measurementa A

1

totally enclosed and totally enclosed fan ventilatedc

class of insulationb

class of insulationb

B

F

H

A

E

B

F

H

60

75

85

105

125

65

80

90

105

125

55

65

75

95

115

55

70

80

95

115

1) armature series field compoles R T

60 55

75 65

85 75

105 95

125 115

65 55

80 70

90 80

105 95

125 115

2) shunt field

R T

60 50

75 65

85 75

105 95

125 115

65 55

80 70

90 80

105 95

125 115

Insulated windings of a.c. single phase and polyphase induction machines other than those specified in Item 2

R

E

ventilated

T

Insulated winding of: 2

3

Iron parts in contact with insulated windings

T

55

65

75

95

115

55

70

80

95

115

4

Sliprings and commutators

T

55

70

80

95d

115d

55

70

80

95d

115d

5

Uninsulated windings, iron cores and other parts not in contact with insulated windings

The temperature rise shall in no case reach a value such that there is risk of damage to any insulating or other material on adjacent parts.

aR

= resistance method T = thermometer method. b The classification of insulating materials is dealt with in BS 2757. c For submersible machines in accordance with 3.2 the permissible temperature rise should be subject to agreement between the purchaser and the manufacturer. d For these temperatures special precautions may be necessary in the choice of brush grades.

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For example, if the specified temperature of the cooling air on site is 80 °C, and the temperature of the cooling air on test is 20 °C, the percentage reduction in temperature rise to take account of the difference is: 80 – 20- = 12 -----------------5

The permissible temperature rise on test is therefore: 100 – 12 = 88 % of the temperature rise adjusted in accordance with 6.3.1 to 6.3.4 as appropriate. 6.4 Correction of temperature rise for variations in altitude For machines specified to operate at an altitude higher than 1 000 m but not higher than 4 000 m7), no correction shall be made if the difference between the altitude during test and the specified altitude in service does not exceed 1 000 m but, if the specified altitude exceeds the test altitude by more than 1 000 m, the temperature rise during the Factory Test shall be reduced from that specified in Table 1 at the rate of 1 % for each increment of 100 m in excess of 1 000 m difference between the site altitude and the test altitude.

7 Momentary overloads

7.2.1 Unless otherwise agreed between the manufacturer and the purchaser, motors rated in accordance with this standard shall be capable of providing to test, without injury, the excess torque specified in Table 2, after having attained temperature rise corresponding to their rated load. During the tests the voltage (in the case of a.c. motors, the frequency also) shall be maintained at the rated value. 7.2.2 For motors of special types e.g. of speeds less than 700 rev/min, or for frequencies outside the range of 40 to 60 Hz, the values of the excess torque shall be agreed between the manufacturer and the purchaser. NOTE For motors designed specifically for driving fan loads no excess torque is necessary provided the loading requirements under the worst running conditions are specified by the purchaser to the manufacturer.

8 Commutators, brush gear and slip rings The machine shall work with fixed brush setting from no load to the momentary overload specified in clause 7 without injurious sparking or damage to the commutator, brushes or slip rings. Table 2 — Momentary overload for motors Type of machine

The values of momentary overload for generators and motors specified in this clause are intended as a check on the ability of the machine to withstand momentary overload without injury. These values are not intended to govern the setting of protective devices in the control gear or other ancillary equipment. The period of 15 seconds is merely a convenient time for test purposes. 7.1 Momentary overload for generators --`,``-`-`,,`,,`,`,,`---

Unless otherwise agreed between the manufacturer and the purchaser, a machine rated in accordance with this standard shall be capable of providing on test, without injury, the following excess output current after having attained the temperature rise corresponding to the machine’s rated load, the voltage being maintained as near the rated value as possible. The exact value of the voltage is not important. Percentage of full load

Excess output current for 15 seconds:

7.2 Momentary overload for motors

d.c. generators 50 a.c generators 50

Minimum excess torque for 15 seconds

percentage of full load 60 split-phase capacitor start induction run 60 capacitor start capacitor run 60 capacitor start and run 25 shaded pole 10 a.c./d.c. and series commutator 50 polyphase cage induction motors wound for 8 poles or more or rated 180 W or below 60 polyphase cage induction motors wound for fewer than 8 poles and rated above 180 W 100 d.c 60 NOTE Greater excess torques may be obtained for many of the types of motors listed in Table 2 (see examples in Table 5, Appendix A). These depend upon the number of poles, speed, output, etc. and should be subject to agreement between the manufacturer and the purchaser. Lower excess torques may be obtained for the types of motor referred to in 7.2.2.

7) It machines are intended to operate at an altitude in excess of 4 000 m, the temperature rise during the Factory. Test should be the subject of agreement between the manufacturer and the purchaser.

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9 Full load efficiency

11.4 Routine tests

If the purchaser requires a statement of efficiency he should ask for it at the time of enquiry and, in the case of a.c. generators, he should also specify the power factor appropriate to this efficiency. Tolerances are given in Clause 18.

Routine tests shall be made on every machine to show that it has been assembled correctly, is able to withstand the appropriate high-voltage test and is in sound working order both electrically and mechanically. Results of routine test need not be recorded.

10 Power factor If the purchaser requires a statement of power factor for an a.c. motor, this shall be requested at the time of the enquiry. Tolerances are given in Clause 18.

11 Tests 11.1 General The tests specified in this clause shall normally be made at the manufacturer’s works. If normal test arrangements are inapplicable or additional tests are required, the tests to be made, and the manner of their application, shall be agreed between the manufacturer and the purchaser before the order is placed. The presence of the purchaser or his representative during the tests shall be a matter of special arrangement before the order is placed. Three categories of test are normally recognized, and these are described in 11.2, 11.3 and 11.4. 11.2 Performance tests

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Performance tests on a specific machine shall be made at the rated voltage, or at the mean of the voltage range and, for a.c machines, at rated frequency. They shall include, where appropriate, tests for temperature rise (see Clause 6) momentary overloads (see Clause 7) high voltage (see Clause 16) commutation (see Clause 8) electrical input at rated load and tests for establishing current, speed and torque characteristics. The results of all performance tests shall be recorded. 11.3 Type tests Type tests shall include all tests referred to under performance tests. They shall be taken on a representative machine of each type of design to determine its characteristics and show that it complies with this standard. The results of type tests shall be recorded.

12 Application of tests The results of type tests carried out on a identical to those being purchased shall be held available by the manufacturer as evidence, in conjunction with routine tests, that the machine comply with this standard. Unless otherwise specified, certificates of type test may be furnished by the manufacturer as evidence of compliance with this standard. When results of such type tests are not available, and when specified and agreed before the order is placed, performance tests shall be made on the first machine of each design, and routine tests shall be made on all subsequent machines of the same design.

13 Temperature rise tests 13.1 General For performance tests a temperature rise test shall be carried out to prove compliance with Clause 6. 13.2 Initial temperature of a machine having a short-time rating At the start of the temperature rise test on a machine having a short-time rating, the temperature of the windings shall be within 2 °C of the cooling air. 13.3 Duration of temperature rise test The temperature rise test on a machine having a continuous rating shall be of a duration sufficient to show evidence that the temperature rise would not exceed the limits of this standard. The duration of the temperature rise test for a machine having a short-time rating shall be the time required by the rating. 13.4 Temperature rise test for machines designed to operate over a voltage range If a machine is specified to operate over a range of voltage, the temperature rise that shall be carried out at the mean voltage unless otherwise specified.

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13.5 Temperature rise test for machines having more than one rating

16.4 High voltage tests on assembled apparatus

If a machine has more than one rating, the temperature rise test shall be carried out at that rating which produces the greatest temperature rise. In cases where this cannot be determined beforehand the machine shall be tested separately at each of its ratings.

A repetition of the tests in Table 3 should be avoided if possible. When the test is made on assembled apparatus including a small-power electric motor which has previously passed its high voltage test in accordance with 16.2 and 16.3, the test voltage applied to the motor shall be limited to 80 % of the test voltage shown in Table 3. Before making the high voltage test the windings shall be clean and the machine shall be thoroughly dry.

14 Torque tests Test for torque normally be made at the rated voltage, or at the mean of the voltage range, with the machine starting at the normal ambient temperature which shall be not less than 15 °C.

15 Commutation test A commutation test shall be made at the conclusion of the temperature rise test on the machine and the requirements of Clause 8 shall be complied with.

16 High voltage tests 16.1 General A high voltage test in accordance with Table 3 shall be applied once only to each new machine in working condition with all its parts in place8) and shall, unless otherwise agreed, be made at the manufacturer’s works, preferably at the conclusion of the temperature rise test when this is taken. The high voltage test in accordance with Table 3 shall be made between the windings and the frame of the machine with the frame connected to any windings not under test. 16.2 Performance and type tests The prescribed test voltage shall be maintained for one minute. 16.3 Routine test For routine tests the duration of the test voltage shall be not less than 5 seconds for the values specified in Table 3, or 1 second for test voltages of 120 % of the values specified in Table 3. The test voltage shall be alternating, of any frequency between 25 and 60 Hz of approximately sinusoidal waveform. Table 3 — Test voltages Maximum working voltage of winding

If requested at the time of ordering, the appropriate test certificates shall be supplied by the manufacturer.

18 Tolerances on characteristics of machines Where a statement of characteristics is given, the tolerances shall be in accordance with Table 4 unless otherwise agreed. Where a tolerance is stated in only one direction the tolerance in the other direction is considered unimportant.

19 Terminal and lead markings For connections to the supply, machines shall be provided with either terminals or leads. The identification of terminals or leads shall be in accordance with BS 822-6. Where machines are provided with leads only, these may be identified by colours in accordance with BS 822-6 as an alternative, or in addition, to marking. When machines are fitted with terminals, it is recommended that the leads within the same machine between the windings and terminals should be identified by the same colours as for loose ends.

20 Radio interference When radio interference suppression is required it should be by agreement between the manufacturer and the purchaser and shall comply with BS 800 for land installations and with BS 1597 for marine installations.

500 V plus twice rated voltage

For windings designed for 100 V and above

1 000 V plus twice rated voltage with a minimum of 1 500 V

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Test voltage r.m.s.

For windings designed for less than 100 V

8)

17 Test certificates

BS 5000-11:1973

Table 4 — Tolerances Characteristics

Tolerance

Full load efficiency

Full load power factor

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Voltage of generators required to work without a field regulator at rated load and working temperature Speed of motors at rated full load torque and at working temperature: 1) Induction motors 2) Continuously rated motors with shunt or compound characteristics 3) Continuously rated motors with series characteristics above 250 W per 1 000 rev/min 250 W and below per 1 000 rev/min 4) All short-time rated motors other than induction motors

— 1/6 of (100 – ½) with a maximum of 5 % where ½ is declared efficiency expressed as a percentage. For example, for a declared efficiency of 60 % the minimum permissible value is 55 % — 1/5 of (1 – cos ø) with a minimum of 0.02 and a maximum of 0.12, where cos ø is the stated power factor expressed as a decimal ± 12" % ± 50 % of the stated slip ± 12" % ± 15 % ± 20 % ± 20 %

NOTE No tolerances are specified for torque characteristics or starting current because of the variety of types of motor covered by this standard. Where these are important the tolerance should be the subject of agreement between the manufacturer and the purchaser. A guide to torque and locked rotor current characteristics of four-pole induction motors is given in Appendix A.

21 Information to be given on the machine Machines complying with this standard shall have the following information indelibly marked on the machine unless otherwise agreed between the user and the manufacturer: 1) The number of this British Standard, i.e. BS 5000-11. 2) The manufacturer’s name (or other means of identification) and country of origin. 3) The manufacturer’s reference number. 4) Watts or volt amperes output. 5) Class of rating (see 4.2). 6) The letters A.O.M. for fan motors to be mounted in the air stream. 7) Rated voltage or voltage range (see 4.5). 8) Rated full load current in amperes. 9) Number of phases. 10) Frequency in Hz. 11) Speed. 12) Class of insulation. 13) Type of machine, e.g. motor or generator, a.c. and/or d.c. (see 3.1). 14) Maximum ambient temperature if other than 40 °C.

15) Where applicable (see 3.4), the British Standard frame number in accordance with section 2 of this standard or in accordance with inch dimensions in BS 2048-1.

22 Rating of capacitors When capacitors are provided they shall be marked with the capacitance and voltage ratings.

Section 2. Metric dimensions 23 Frame designation Frames shall be designated by the letters “BM” followed by a number to indicate the centre height in millimetre units (based on foot-mounted type). For machines other than plain foot-mounted, the designation shall have an additional suffix letter in accordance with Table 6 (e.g. BM67D indicates a machine with a centre height of 67 mm of the flange-mounted type without feet, provided with clearance holes in the flange). Rating plates of machines shall be marked with the appropriate frame designation where applicable.

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BS 5000-11:1973

Table 6 — Suffix letters

25 Dimensions, tolerances and limits

Description

Suffix letter

Foot-mounted machine Machine with resilient mounting Flange-mounted machine without feet, provided with tapped holes in the flange Flange-mounted machine without feet, provided with clearance holes in the flange Foot-mounted machine provided with a mounting flange having tapped holes Foot-mounted machine provided with a mounting flange having clearance holes

No suffix letter A

Dimensions, tolerances and limits shall be in accordance with Table 8 or Table 9 for the appropriate frame. Dimensions are nominal unless otherwise indicated in the tables. The spigot run-out and the squareness of mounting face of flange to shaft shall be measured as specified in sub-clauses 3.2.2 and 3.2.3 of BS 4999-141:1987. Where screw threads are specified they shall be ISO metric complying with the requirements of BS 3692.

C

D

26 Access for flange-fitting bolts

E

F

NOTE The relationship between frame size and output is not specified because of the variety of types of supply (e.g. single-phase a.c., 3-phase a.c., d.c.), rating and types of enclosures.

24 Letter symbols Letter symbols to indicate various dimensions are given in Table 7. The symbols in column 1 of Table 7 relate to standardized dimensions and are shown ringed in Figure 1 and Figure 2. The symbols in column 2 of Table 7 relate to dimensions that are not standardized. These dimensions are shown unringed in Figure 1 and Figure 2 and are included to facilitate and standardize the preparation and presentation of dimensional drawings.

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For flange-mounted machines provided with clearance holes in the flanges, the profile of the casing between the machine side of the flange and the machine itself shall be such that it is always possible to insert a hexagon-headed bolt, dimensioned in accordance with BS 3692 and fitted with a spring washer dimensioned in accordance with BS 4464, into the fixing holes, to obtain a projection of the threaded portion, measured to the face of the flange, of not less than dimension LZ.

27 Electric connections The point at which the supply leads enter the machine shall be on the right-hand side of the machine when viewed from the non-driving end.

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BS 5000-11:1973

Table 7 — Letter symbols to indicate dimensions 1

2

3

Letter symbol Standardized dimensions

Non-standardized dimensions

A AB AC AK B BB C --`,``-`-`,,`,,`,`,,`---

D E ED F G H HA HC HD K

LZ

Description of dimension

L LA LB

M N P S T

Distance between centre lines of fixing holes or slots (end view) Overall dimension across feet or base (end view) Overall diameter or width of casing, including cowl if fitted Travel of bolt in slot in foot or base Distance between centre lines of fixing holes (side view) Overall dimension across feet or base (side view) Distance from centre line of fixing holes or slots at driving end to shaft shoulder Diameter of shaft extension Length of shaft extension from shoulder Minimum length of keyway or flat Width of keyway Distance from bottom of flat or keyway to opposite side of shaft Distance from centre line of shaft to bottom of feet or base Thickness of feet Distance from top of machine to bottom of feet or base Vertical distance from top of capacitor or other auxiliary equipment to bottom of feet or base (where such equipment is mounted on the machine) Diameter of holes or width of slots in feet or base Overall length Thickness of flange Distance from fixing face of flange to non-drive end Minimum projection of threaded screw or bolt from face of flange when a hexagon-headed screw or bolt with spring washer fitted under the head is inserted Pitch circle diameter of fixing holes Diameter of spigot Outside diameter of flange Diameter of clearance holes or designation of tapped holes in flange Depth of spigot

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NOTE 1 Ringed symbols refer to standardized dimensions which are specified in Table 8. Unringed symbols are included for reference purposes only. NOTE 2 This figure is intended purely to illustrate the symbols and dimensions referred to in Table 7 and Table 8. Details of construction, such as type of enclosure, are not shown.

Figure 1 — Symbols for dimensions of foot-mounted machines without flanges

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NOTE 1 Ringed symbols refer to standardized dimensions which are specified in Table 8 and Table 9. Unringed symbols are included for reference purposes only. NOTE 2 This figure is intended purely to illustrate the symbols and dimensions referred to in Table 7, Table 8 and Table 9. Details of construction, such as type of enclosure, are not shown.

Figure 2 — Symbols for dimensions of flange-mounted machines and foot-mounted machines provided with a flange

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Table 8 — Standard dimensions for foot-mounted or resilient base-mounted machines All dimensions are in millimetres. Frame size

Fixing C

H

A

Shaft B

K

Bolt size

Nominal Tolerance

BM 67 52 67 BM 76 63 76 BM 89 70 89 a For

+0 –1.6 +0 –1.6 +0 –1.6

D Nominal

Flat E

Keyway

Nominal Nominal key depth of flat size

7

M6

11

h7

108 70

10

M8

14

h7

124 76

10

M8

16a

h7

+0 –0.018 +0 –0.018 +0 –0.018

23 30 40

G

Width F Min.

Tolerance

90 59

ED

Max.

Min.

Max.

1

—

—

—

16

10

9.73

1.2

—

—

—

21

12.8 12.53

—

5×5

4.97

5.05 25

13.0 12.8

certain applications the standard shaft may not be suitable and in such cases a 19 mm diameter shaft with length of 40 mm may be supplied.

BS 5000-11:1973

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All dimensions are in millimetres p.c.d.

Spigot detail

Frame sizea Diameter N

M

Nominal

C D BM 67 E F C D BM 76 E F C D BM 89 E F

Tolerance

Depth T min.

Limit of spigot run-out and flange face squarenessb

100

80

h9

+0 3 –0.074

0.10

115

95

h9

+0 3 –0.087

0.10

130 110

h9

+0 3 –0.087

0.10

Flange O.D. LZ holes P

Shaft

Sc

D Nominal

M6 7 120 M6 7 M8 10 140 M8 10 M8 10 140 M8 10

a

— 8 11 — 8 — 9.5 14 — 9.5 — 9.5 16d — 9.5

Flat E

Keyway

Nominal Nominal depth key size

Tolerance

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G

Width F min. max.

max.

min.

h7

+0 23 1 –0.018

—

—

—

16 10

h7

+0 30 1.2 –0.018

—

—

—

21 12.8 12.53

h7

+0 40 — –0.018

5×5

4.97 5.05 25 13

The meanings of suffix letters are given in Table 6. Full indicator measurement (total indicator reading). c Dimensions for clearance holes are selected from the coarse series in BS 4186. d For certain applications the standard shaft may not be suitable and in such cases a 19 mm diameter shaft with length of 40 mm may be supplied. b

ED

9.73

12.8

BS 5000-11:1973

14

Table 9 — Standards dimensions for flange-mounted machines

BS 5000-11:1973

Appendix A Notes on the torque characteristics and application of induction motors A.1 This appendix on torque characteristics is intended to serve only as a guide to generally accepted practice in regard to small-power induction motors. These motors are generally available with torque characteristics as shown in Table 5, expressed as percentages of full load. The figures apply to motors designed for the preferred speed, at 50 Hz, of approximately 1 425 rev/min operating at rated voltage, or at the mean of the voltage range. It will be noted that in items (1), (2), (3) and (6) of Table 5 alternative torque characteristics are available. Table 5 — Torque characteristics Item no.

Type

Pull-out torque

Run-up torque

Locked rotor torque

Locked rotor current

percentage of full load (1) a

split-phase

200

125

150

800

250

200

225

1 000

capacitor start induction run

200

175

250

500

250

200

300

600

capacitor start, capacitor run

200

175

250

500

250

200

300

600

(4)

capacitor start and 140 run

25

35

400

(5)

shaded pole

120

25

35

200

(6) a

polyphase

200

175

200

600

300

250

300

600

(1) b (2) a (2) b (3) a (3) b

(6) b

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A.2 Motor applications A.2.1 Split-phase9). Owing to their high locked rotor current, split-phase motors are generally used for loads of low inertia and infrequent starting. When the higher locked rotor currents can be tolerated, motors of the higher torque rating (1) b of Table 5 can be used. A.2.2 Capacitor start induction run9). These motors, having higher locked rotor torques and lower locked rotor currents than split-phase motors, are generally more suitable for loads of higher inertia and more frequent starting. A.2.3 Capacitor start, capacitor run9). These motors have characteristics similar to those covered by A.2.2 but are more suitable for use when a greater degree of quietness or a higher efficiency and power factor are desirable. A.2.4 Capacitor start and run. These motors are for use where low locked rotor torques are acceptable. They are also generally quieter than split-phase or capacitor start induction run motors. A.2.5 Shaded pole. These motors are suitable for all applications where only a very low locked rotor torque is required and motor efficiency is unimportant. A.2.6 Polyphase. Polyphase motors will generally satisfy all requirements which are met by single-phase machines of similar torque ratings. NOTE Locked rotor, run-up and pull-out torques of motors vary approximately as the square of the voltage at the motor terminals. Unless the wiring is adequate to carry the locked rotor current without excessive voltage drop, the torque available during starting will be seriously reduced.

9) Unless

otherwise specified, these motors are provided with some means of switching out or modifying the auxiliary or starting winding, e.g. centrifugal switches or electro-magnetic relays. The information required in B.1.2 7) is particularly important in these cases.

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Appendix B Information to be given with enquiry and order B.1 When enquiring about, or ordering, an electrical machine to be rated in accordance with this standard, the general particulars listed in B.1.1 should be supplied. The additional particulars listed in B.1.2 or B.1.3 should also be supplied when enquiring for, or ordering, a motor or generator. B.1.1 General. The following general information should be supplied: 1) The number of this British Standard, i.e. BS 5000-11. 2) Quantity required and/or yearly rate of usage. 3) Speed at rated output in revolutions per minute. (See 5.7.) 4) Number of phases (a.c. only). 5) Frequency, in Hz (a.c. only). 6) Class of rating (See 4.2). 7) Type of enclosure (See 3.2). 8) Type of bearings; sleeve, ball, etc. 9) Direction of rotation (looking at the driving or driven end)10). 10) Site and operating conditions including maximum and minimum ambient temperature. 11) Drive, e.g. belt, direct coupled. 12) Method of mounting, e.g. foot, resilient, flange. 13) Installed position of motor, i.e. horizontal or vertical shaft. 14) Radio interference suppression if required. 15) Thermal protection it required. 16) Any other particulars which will guide the supplier to supply a machine of suitable size, type and characteristics. 17) Whether the machine is to comply with the dimensional requirements of section 2 in addition to the constructional and electrical performance requirements of section 1. B.1.2 Additional information applicable to motors. The following information should be furnished in addition to that specified in B.1.1: 1) Mechanical output in watts (at each speed for multi-speed motors). (See 5.6.) 2) Voltage (or voltage range) available at motor terminals. 3) Nature of supply, i.e. direct current or alternating current. 4) Method of starting, e.g. direct on line, resistance, etc. 5) Method of speed control, if any, e.g silicon controlled rectifier. 6) Any restrictions on starting current. 7) Nature of load and any information regarding the driven machine which has a bearing upon the torque required during the accelerating period, the kinetic energy of the moving parts to be accelerated, the number of starts during a specified period and the nature of temporary overloads that might be met. B.1.3 Additional information applicable to generators. The following information should be supplied for generators: 1) Electrical output: a) watts for d.c. machines. b) volt amperes and power factors for a.c. machines. 2) Voltage at terminals at rated load. 3) Nature of output, whether d.c. or a.c. 4) Method of excitation: shunt, series, compound, or separately excited. If separately excited, state excitation voltage.

10)

Standard direction of rotation is clockwise looking at driving or driven end.

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5) State if generators are to operate between various limits of voltage and/or speed and if so, whether the full output is required over the whole range or at the top voltage and/or speed only. 6) Type of load for which output is required. 7) Nature of temporary overloads which might be applied.

Appendix C Terms and definitions

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1) Machine. Any electric motor or generator to which this standard applies. 2) Rating. A statement of operating limits assigned to a machine by the manufacturer. 3) Continuous rating. A rating that specifies a load at which the machine may be operated for an unlimited period under the conditions specified on the rating plate. 4) Short-time rating. A rating that specifies the time during which the machine may be operated on load under the conditions specified on the rating plate. 5) Overload11). Any load in excess of the rated load. Usually the amount of the excess is expressed as a percentage excess current for generators and as a percentage excess torque for motors. 6) Momentary overload11). An overload the duration of which is so short as not to affect appreciably the temperature of the machine. 7) Multi-speed motor or change-speed motor. A motor that can be operated at any one of two or more definite speeds with a particular device connected to the motor shaft, e.g. a change-pole induction motor or a d.c. shunt motor with a pre-set speed adjustment. 8) Locked rotor current11). The maximum measured steady-state r.m.s. current taken from the line with the motor at rest, for all angular positions of its rotor. 9) Locked rotor torque11). The minimum torque that the motor will develop at rest for all angular positions of the rotor. 10) Run-up torque or pull-up torque11). The minimum torque developed by an a.c. motor while running up from standstill to the speed at which the pull-out torque occurs. 11) Pull-out torque11). The maximum torque that an a.c. motor will develop under running conditions.

11)

These definitions assume the application of rated voltage and (for a.c. machines) rated frequency.

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Publications referred to BS 800, Specification for radio interference limits and measurements for household appliances, portable tools and other electrical equipment causing similar types of interference. BS 822, Terminal markings for electrical machinery and apparatus. BS 822-6, Terminal markings for rotating electrical machinery. BS 1597, Specification for limits and methods of measurement of electromagnetic interference generated by marine equipment and installations. BS 2048, Specification for dimensions of fractional horse-power motors. BS 2048-1, Dimensions of motors for general use. BS 2757, Method for determining the thermal classification of electrical insulation. BS 3692, Specification for ISO metric precision hexagon bolts, screws and nuts. Metric units. BS 4186, Specification for clearance holes for metric bolts and screws. BS 4464, Specification for spring washers for general engineering and automobile purposes. Metric series. BS 4999, General requirements for rotating electrical machines. BS 4999-0, General introduction and index12). BS 4999-105, Classification of degrees of protection provided by enclosures for rotating machinery. BS 4999-106, Classification of methods of cooling. BS 4999-141, Specification for standard dimensions. BS 5000, Specification for rotating electrical machines of particular types or for particular applications. BS 5000 Index: Issue 5:1987, General introduction and index. BS 5000-10, General purpose induction motors. BS 5000-99, Machines for miscellaneous applications.

12) Referred

to in the foreword only. --`,``-`-`,,`,,`,`,,`---

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BSI — British Standards Institution BSI is the independent national body responsible for preparing British Standards. It presents the UK view on standards in Europe and at the international level. It is incorporated by Royal Charter. Revisions British Standards are updated by amendment or revision. Users of British Standards should make sure that they possess the latest amendments or editions. It is the constant aim of BSI to improve the quality of our products and services. We would be grateful if anyone finding an inaccuracy or ambiguity while using this British Standard would inform the Secretary of the technical committee responsible, the identity of which can be found on the inside front cover. Tel: 020 8996 9000. Fax: 020 8996 7400. BSI offers members an individual updating service called PLUS which ensures that subscribers automatically receive the latest editions of standards. Buying standards Orders for all BSI, international and foreign standards publications should be addressed to Customer Services. Tel: 020 8996 9001. Fax: 020 8996 7001. In response to orders for international standards, it is BSI policy to supply the BSI implementation of those that have been published as British Standards, unless otherwise requested. Information on standards BSI provides a wide range of information on national, European and international standards through its Library and its Technical Help to Exporters Service. Various BSI electronic information services are also available which give details on all its products and services. Contact the Information Centre. Tel: 020 8996 7111. Fax: 020 8996 7048. Subscribing members of BSI are kept up to date with standards developments and receive substantial discounts on the purchase price of standards. For details of these and other benefits contact Membership Administration. Tel: 020 8996 7002. Fax: 020 8996 7001. Copyright Copyright subsists in all BSI publications. BSI also holds the copyright, in the UK, of the publications of the international standardization bodies. Except as permitted under the Copyright, Designs and Patents Act 1988 no extract may be reproduced, stored in a retrieval system or transmitted in any form or by any means – electronic, photocopying, recording or otherwise – without prior written permission from BSI. This does not preclude the free use, in the course of implementing the standard, of necessary details such as symbols, and size, type or grade designations. If these details are to be used for any other purpose than implementation then the prior written permission of BSI must be obtained.

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