BS 6581:1995

1 Scope
2 Normal and special service conditions
    2.1 Normal service conditions
    2.2 Special service conditions
3 Definitions
4 Rating
    4.1 Rated voltage
    4.2 Rated insulation level
    4.3 Rated frequency
    4.4 Rated normal current and temperature rise
    4.5 Rated short-time withstand current
    4.6 Rated peak withstand current
    4.7 Rated duration of short circuit
    4.8 Rated supply voltage of closing and opening
         devices and auxiliary circuits
    4.9 Rated supply frequency of operating devices and
         auxiliary circuits
    4 10 Rated pressure of compressed gas supply for
         operation
5 Design and construction
    5.1 Requirements for liquids in switchgear and
         controlgear
    5.2 Requirements for gases in switchgear and
         controlgear
    5.3 Earthing of switching device
    5.4 Auxiliary equipment
    5.5 Dependent power closing
    5.6 Stored energy closing
    5.7 Operation of releases
    5.8 Low and high pressure interlocking devices
    5.9 Na?meplates
6 Type tests
    6.1 Dielectric tests
    6.2 Radio interference voltage (r.i.v) test
    6.3 Temperature rise tests
    6.4 Measurement of the resistance of the main
         circuit
    6.5 Short time withstand current and peak withstand
         current tests
7 Routine tests
    7.1 Power frequency voltage withstand dry tests on
         the main circuit
    7.2 Voltage withstand tests on auxiliary and
         control circuits
    7.3 Measurement of the resistance of the main
         curcuit
8 Guide to the selection of switching devices for
    service
9 Information to be given with enquireies, tenders and
    orders
10 Rules for transport, storage, erection and
    maintenance
    10.1 Conditions during transport, storage and erection
    10.2 Erection
    10.3 Maintenance
Annex A - Determination of minimum external creepage
          distances of outdoor insulators
Appendix B - Determination of the equivalent r.m.s
             value of a short time current during a
             short circuit of a given duration
Annex ZA - Special national conditions
Annex ZB - Other international publications quoted in
             this standard with the references of the
             relevant European publications

Specifies common requirements for definitions, ratings, design and construction, type tests, routine tests, selection, enquiry/ordering information, rules for transport, storage and erection for equipment above 1000 V and up to 60 Hz.