OP
Engineer54
I refuse to get involved!! lol!!! ....But please, when refering to TT systems it's ''Ra'' NOT Ze....
Discuss Very Hi ZS Reading on TT system? any advice in the Australia area at ElectriciansForums.net
ZE was 187
the system is protected by a 30ma RCD from the main house, and the new board is also protected by a 30 ma RCD.
would that be a 30mA RCD protecting the sub main and another 30mA RCD protecting the final circuits in the outbuilding i.e. 2 RCD's in series
too slow, specialist beat me
Hey: I've got to beat someone at posting at least once a year:lol:
I refuse to get involved!! lol!!! ....But please, when refering to TT systems it's ''Ra'' NOT Ze....
sorry if i read that wrong mechelec but why would 2 rcd`s in series slow the disconnection time
sorry if i read that wrong mechelec but why would 2 rcd`s in series slow the disconnection time
sorry if i read that wrong mechelec but why would 2 rcd`s in series slow the disconnection time
Ok then your maximum allowed Zs reading for each 30mA protected circuit is 1667 Ohms, problem solved in 31 posts.
Your RCD at the supply end should ideally be an 'S' type time delayed to achieve discrimination with the RCD at the remote end but I wouldn't loose sleep over that one.
So to confirm,
ZS readings of 2.6 ohms or there abouts is acceptable, providing the system and all circuits are protected by a 30ma RCD. (which they are)
??
Reply to Very Hi ZS Reading on TT system? any advice in the Australia area at ElectriciansForums.net
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