EFL on TN-S with RCD

[devon1]

That would be Ze, not Zs.

A Ze or Ra of more than 200Ω on a TT is considered unstable as Caddy says.

The maximum Zs of circuits on a TN system should be taken from Tables 41.2 to 41.4 on pages 48 & 49 of BS7671.

Thanks i'll take a look in work tomorrow

cheers guys i'll look in my regs and gn3 2moro

 

[caddy]

Quote:
Originally Posted by caddy
the max ZS on an a TN-S should still be around 0.8

The max Ze, not Zs, should be 0.8 on a TN-S.




Indeed it is, A simple mistake on my part although I shall blame the keyboard layout for it