BS 9120:1988

Foreword
Committees responsible
Specification
Section one. Principles and mandatory procedures
1.1 General matters
1.1.1 Scope
1.1.2 Related documents
1.1.3 Terminology
1.1.4 Letter symbols, signs and abbreviations
1.1.5 Graphical symbols
1.1.6 Marking
1.1.7 Eligibility for qualification approval
1.1.8 Structurally similar components
1.1.9 Delayed delivery
1.1.10 Supplementary procedures for qualification
        approval
1.1.11 Certified test records
1.1.12 Ratings and characteristics
1.1.13 Uncheck parameters
1.1.14 Procedure to be followed in the event of a
        failure in a periodic test
1.1.15 Release for delivery before completion of group
        B tests
1.1.16 Component parts of filter assemblies
1.1.17 Capability approval
1.2 Test procedures
1.2.1 General
1.2.2 Measurement conditions
1.2.3 Visual examination
1.2.4 Dimensions and gauging
1.2.5 Electrical test procedures
1.2.6 Mechanical test procedures
1.2.7 Environmental testing procedures
Section two. General rules for the preparation of detail
specifications
2.1 Basic information
2.1.1 General
2.1.2 Originator of the detail specification
2.1.3 Detail specification number
2.1.4 Description of the component and intended
        application
2.1.5 Drawings
2.1.6 Ratings (including limiting conditions of use)
2.1.7 Related documents
2.1.8 Additional information that is not for inspection
        purposes
2.2 Inspection requirements
2.2.1 General
2.2.2 Group A inspection
2.2.3 Group B inspection
2.2.4 Group C inspection
2.2.5 Group D inspection
2.3 Certified test records
2.3.1 General information
2.3.2 Attributes information
2.3.3 Measurements information
2.4 Instructions for ordering components
2.5 Low-volume, high-cost items
Appendices
A. Example of a certified test record
B. Voltage proof test
C. Measurement of leakage current (mains filter units
     only)
D. Endurance tests for mains filter units
E. Test for electrical shock hazard under normal
     conditions
F. Tests on cable or cords and their anchorage to
     filter units
G. Temperature rise at rated current test
H. Spike test
J. Measurement of connector contact resistance
K. Dust and sand resistance test
Tables
1. Peak pulse voltages
2. Filter unit terminations
3. Insertion loss limits
4. Creepage and clearance limits
5. Test voltages for insulation resistance
6. Tensile test force for wire terminations
7. Cable sizes and current ratings
8. Maximum sizes of cables and conduit for rated
     currents up to 16 A
9. Number of 24 h cycles
10. Inspection procedure for filters. Group A tests
11. Inspection procedure for filters. Group B tests
12. Inspection procedure for filters. Group C tests
13. Inspection procedure for filters. Group D tests
14. Values for endurance testing
15. Final inspection, measurements and requirements
16. Number of specimens to be tested for rated voltage
     (mains filter units only)
17. Minimum creepage and clearance distances at rated
     voltages
18. Torque values for screws and nuts
19. Cable pulling
20. Permissible cable and cord masses for given rated
     current
Figures
1. D.C. voltage proof test circuit
2. Class II single-phase filter units
3. Single-phase filter units other than class II
4. Three-phase filter units
5. Application of test voltage
6. Spike test circuit detail

Prescribes terms, methods of test and inspection requirements for radio interference suppression filters, including mains filter units, for use in the electrical power supply to electronic or electric equipment.

This British Standard establishes terms, methods of test and inspection procedures for radio interference suppression filters of assessed quality for use in electronic equipment and in the electrical power supply to equipment, appliances, machines and apparatus. It includes safety requirements and tests which may be mandatory, according to the application.

NOTE. The filter may form part of equipment to which other safety requirements apply, e.g. BS 415, BS 3456.

This standard is intended to be used in conjunction with BS 9000 and with related detail specifications in which are stated the dimensions, ratings, tests and requirements applicable to individual filters or series of filters.