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Full Description

Applies only to ground mounted circuit-breakers, the supporting structures of which are rigidly connected with the ground. The seismic qualification of a circuit-breaker is only performed on request.

Cross References:
BS 2011:Part 1.1
BS 2011:Part 2.1Fc
BS 2011:Part 2.1Ff
BS 2011:Section 4.1
BS 2011:Section 4. 3
IEC 50(441)
CENELEC HD 348 S4