Discuss Advice wanted - unhappy with rewire in the UK Electrical Forum area at ElectriciansForums.net
ssssimplees it's in case 1 falls out due to incompetent installation.I've wanted to know how putting the RFC cpc's in separate earth terminals, assist in high integrity earthing, if someone could help me out.
no offence taken, but you should research as to why the cpcs should be separated betweed 2 terminals.My reason is common sense most electronic devices use switchmode transformers which filter to earth .The regs state " which can be reasonably be expected to exceed 10ma " .Well it's your choice mate .But considering socket outlets come with two terminals !
It appears you have over reacted to a quite Justified statement .It wasn't meant as an insult to your work sorry if you took it that way . 543.7.2 ( 18 )
I've wanted to know how putting the RFC cpc's in separate earth terminals, assist in high integrity earthing, if someone could help me out.
Again no offence meant .But I have .This has become more of an issue in domestic Installations with the popularity in Led lighting and other newer electronic devices now using filtered PSU's . The main point is safety due to possible earth current transfer from device to device either resulting in capacitor induced shock or even fire . As someone else has stated this can result from a bad connection either by a high resistance connection, mechanical damage or possible capacitor failure within the device itself .no offence taken, but you should research as to why the cpcs should be separated betweed 2 terminals.
It’s not a fudging ring main!I hope this isn't one of yours ! Ring main Earths are one cable per terminal not two as in your picture
the purpose of separating the cpc's into separate terminals is in case 1 becomes loose or snapped, you'll still have earthing (protective and functional) to equipment .
I think this is maybe what Stuey was getting at when he stated 543.7.2 but this is a separate issue. We generally work through the regs book and earth leakage is mentioned previously in 531.3.2 , we should select the correct type of RCD for the installation as per 531.3.4Yes, I understand what you are saying and don't dispute the point. If you think about it, one or two terminals can suffer the same fate.
I was trying to explain why problems can occur with RCD protection on modern equipment (e.g. computers with switched mode PSUs drawing several amps at 230V) - by design, current will flow through the cpc and unbalance the RCD. Not everybody understands that.
We are talking about high integrity earthing are we not? I'll wait for an answer before I carry on, if that's OK.
Yes, I agree.But on the other hand this is different issue to putting two CPC of a Domestic RFC in the same terminal, especially where most of the switching PSUs will most likely be small types like phone chargers which are mostly double insulated phone chargers.
No not unless the copulative earth leakage current exceeded 10mA Regulation 543.7.1Yes, I agree.
Would you consider a domestic installation as unlikely to need consideration for high integrity earthing unless there is a specific reason (e.g. medical equipment)?
For that read cumulative, predictive text, my foot sorry all for the gaff.Copulative leakage. Brill
Copulative leakage. Brill
Reply to Advice wanted - unhappy with rewire in the UK Electrical Forum area at ElectriciansForums.net
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