OP
nick611
rcd get stuck if you dont test them regular. i,ve been bit by one myself.but the fact remains 1667 ze 0.2 disconnection.who are we to judge
Discuss Zs values? in the Electrical Wiring, Theories and Regulations area at ElectriciansForums.net
1667 is for TT systems.
On a TNS system the mcb or rcbo is your method of complying with 411.3.2.2 & you use table 41.3
The rcd is for additional protection so 1667 does not come into it.
Table 41.5 is for TT systems.
It is alo for TN system Reg 411.4.9 comes under TN. Under this reg table 41.5 can be used in a TN
Well I am just waiting for the first test case for a fatality due to an RCD not operating and saving a life, I fitted a Power breaker RCD/FCU the other day, guess what >400ms over range about as much use as a fridge to an Eskimo, if a domestic inspect is 10 Years on a new install with the lower lethal level of 50ma what's the chances of it operating in <30ma 9 years time ?..None.
I retested mine at home today all come in at under <19ms @ x5
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