Discuss disconnection times v voltage bands in the Electrical Wiring, Theories and Regulations area at ElectriciansForums.net

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BS 7671 table 41.1 shows that a disconnection time of 0.4 secs for 120<volts to <inc 230 volts, and a disconnection time of 0.2 at 230< to < inc 400v. (TN systems).
My query is with a 10%+/- tolerance which could possibly increase 230 volts to 253 volts hence taking your 230v 0.4s disc design into a 0.2 disconnection time scenario.

A bit confused!
 
It's 0.4s for 120V < Uo ≤ 230V.

Uo being the nominal voltage to earth. The tolerance is +10% / -6% (216V - 253V)
 

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