BS 7822-1:1995 Insulation coordination for equipment within low-voltage systems - Part 1. Principles, requirements and tests
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This part of IEC 60664 deals with insulation coordination for equipment within low-voltage systems. It applies to equipment for use up to 2 000 m above sea level having a rated voltage up to a.c. 1 000 V with rated frequencies up to 30 kHz or a rated voltage up to d.c. 1 500 V.
It specifies the requirements for clearances, creepage distances and solid insulation for equipment based upon their performance criteria. It includes methods of electric testing with respect to insulation coordination.
The minimum clearances specified in this part do not apply where ionized gases occur. Special requirements for such situations may be specified at the discretion of the relevant Technical Committee.
This part does not deal with distances:
— through liquid insulation;
— through gases other than air;
— through compressed air.
NOTE 1 Extension of the scope up to 1 MHz is under consideration.
NOTE 2 Higher voltages may exist in internal circuits of the equipment.
NOTE 3 Requirements for altitudes exceeding 2 000 m can be derived from Table A.2 of Annex A.
The object of this basic safety standard is to guide Technical Committees responsible for different equipment in order to rationalize their requirements so that insulation coordination is achieved.
It provides the information necessary to give guidance to Technical Committees when specifying clearances in air, creepage distances and solid insulation for equipment.
