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Discuss TT and RCD protection in the UK Electrical Forum area at ElectriciansForums.net
Unless we excavate the rod we’ll never know.That’s what am saying
Essex, you're always (or rather 99.9% of the time) going to need an RCD for TT as you'll never be able to meet the Zs values unless the Ra<1Ω which (unless you are Trev) is nigh impossible.
I'm pretty sure that reg you have given was in the 17th, so nothing new. Would be very interesting to know if anyone on here has ever been able to get an Ra low enough to forgo an RCD on a TT though?
that must be one of the cleanest meggers i have seen ,just like mineAre you talking domestic?
I've worked in industrial units, multi rodded, maybe nested with Ra of well under. You'd think they were TN, until closer examination.
that must be one of the cleanest meggers i have seen ,just like mine
I would bed to differ. The last TT system we tested was 0.73 and that was only a single rod.
Although I do agree it is unlikely to be ever able to prove a permanently and reliable Zs on a TT system it does loosen the requirements a little and in this case a 500mA RCD would be more than enough.
Reply to TT and RCD protection in the UK Electrical Forum area at ElectriciansForums.net
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