OP
nick611
yes on tt system if ze less than 1667 then everythink ok.because rcd will disconnect in 0.2 thus satisfying 0.4 disconnection time
Discuss Zs values? in the Electrical Wiring, Theories and Regulations area at ElectriciansForums.net
yes on tt system if ze less than 1667 then everythink ok.because rcd will disconnect in 0.2 thus satisfying 0.4 disconnection time
the maximum zs reading on a tn circuit incorporating an rcd shall be 1667 as per iee regs.therefore zs readings redundant on 99% of domestic installations
I would draw peoples attention to 411.4.9
reg 411.5.3 rcd protection 0.2 dissconection any system
reg 411.5.3 rcd protection 0.2 dissconection any system
if a tt system ze up to 1667 will disconnect in 0.2 then a tn max 0.80 can,t fail to can it on an rcd
I did read that the High fault currents on a TN system where the Rcd is designed to operate, at say 30m/amp,it can damage those electronics more readilly than the low fault current TT system
Reply to Zs values? in the Electrical Wiring, Theories and Regulations area at ElectriciansForums.net
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