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I wonder how old the NIC inspection & test label is, seeing as it refers to the IEE?

So, what part of the mains supply did he connect it to (that wasn't earthed)?

OK, take a real-world example. 230V supply, PFC of 10kA. Source impedance is 230/10000 = 0.023ohm To bring the fault current down to 6kA, fault loop impedance needs to be 230/6000 = 0.038ohm The difference is 15mohm. If a final circuit is wired in 10mm² cable, with a circuit resistance of...

If you're using a conventional keyboard (which you may not be), for squared just hold down Alt and hit 0178 or your numeric keypad. eg 2.5mm² T&E

Assuming you mean kA, not kV. The maximum fault current for the circuit will be the PFC at the DB (or near enough) if the fault occurs close to the DB.

A timer with integral switch and fuse would do if fitted outside the bathroom in place of the fused connection unit. tlc-direct .co .uk item SM FBT4 or similar. (Can't post a link due to forum restrictions.) https://www.tlc-direct.co.uk/Products/SMFBT4.html

How about a low power trickle extract in kitchen or bathroom and a ventilation grille in the living room wall to let in the replacement air? Make sure that there's enough gap under the doors in between to allow the air to move freely.

Why would you need to put swa inside copex? Just curious.

I can't see the membership list, but I've spotted Murdoch, Essex1, Canoeboy, Tony S and markc123 amongst the postings. I can't edit my posts yet, so I'll add Marvo as well.

I suspect that you're thinking of the old voltage operated earth leakage circuit breakers (VOELCB). These became obsolescent more than 30 years ago. Today's RCDs work by monitoring the current in line and neutral and tripping if the difference exceeds a threshold, often 30mA. They don't rely on...

Evening chaps. Self-employed electrician in NE Hampshire. I've already spotted a few familiar names. I gather things are a bit limited here until I have ten posts.