S
sambotc
Wired a P.V job today, TT system, old wylex rewirable board and a 100ma RCD on incoming tails. Ze of 50ohms but earth in old 2.5mm or something, black sheath which disappeared behind the spar dash which was obviously done at a later date and earth spike seems to have been tarmaced over!
I put a new sub board in off some henleys with a 16a mcb and a 30ma RCD, the idea being this will trip before the main 100ma so the P.V isn't sharing the 100ma RCD? I also ran a 10mm earth to a new rod that i put in, but left the old 2.5mm and rod (where ever it was) in. The new rod on it's own gave a Ze of 75ohms, but leaving them both connected Ze was down to 23ohms which I thought was pretty good and also main earth size now complied with correct size for meter tails (16mm tails)
Was the RCD the right idea, as obviously with such a high Ze the disconnection times would not have been satisfactory, but more importantly any faault on the P.V would have caused the main 100ma RCDto trip, and also potentially created a back feed situation and causing the 100ma RCD to fall outside of 0.40 disconnection from what I hear on here?
Just wondered what you would have done and if my thoughts were justified?
Thanks in advance
I put a new sub board in off some henleys with a 16a mcb and a 30ma RCD, the idea being this will trip before the main 100ma so the P.V isn't sharing the 100ma RCD? I also ran a 10mm earth to a new rod that i put in, but left the old 2.5mm and rod (where ever it was) in. The new rod on it's own gave a Ze of 75ohms, but leaving them both connected Ze was down to 23ohms which I thought was pretty good and also main earth size now complied with correct size for meter tails (16mm tails)
Was the RCD the right idea, as obviously with such a high Ze the disconnection times would not have been satisfactory, but more importantly any faault on the P.V would have caused the main 100ma RCDto trip, and also potentially created a back feed situation and causing the 100ma RCD to fall outside of 0.40 disconnection from what I hear on here?
Just wondered what you would have done and if my thoughts were justified?
Thanks in advance
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