disconnection time permitted for protective devices?

[electritaz]

what is the disconnection time of the protective devices protecting :
a) a socket outlet circuit
b) a fixed water heater circuit?

 

[acat]

If you have a copy of BS7671 regs your answer is on pages 46 to 50 if not waht system do you have ie TT TNCS TNS and do you have fuses or RCD/MCBs

Chris

Normally 0.4 seconds for domestic circuits and 5 seconds for distribution if I remember correctly

Chris

 

[Spudnik]

As above, but the 5s disconnection time depends on the installation method of the distribution circuit.

Also, TT systems disconnection times are lower.

 

[riotmaster]

and because of that, osg says generally to achieve the disconnection times, EVERY circuit must be protected by an RCD, in one form or another...on a TT system

 

[Mac]

and because of that, osg says generally to achieve the disconnection times, EVERY circuit must be protected by an RCD, in one form or another...on a TT system

All circuits on a TT system should be RCD protected