.... not again, they shout ... Gentlemen, I'm new to the group and have read with interest loadsa stuff about bathroom electrics.
Situation: Mira Advance (9K) - 45A switch outside bathroom - 6mm twin & E cable -
45A MCB on the board. Earth connected at the board. Cable run (old house, 9 foot ceilings, board in the middle room): vertical, clipped, up to attic - about 5.5m, straight across attic (lying on the floor) - about 10m, down to switch for shower - about 1m.I was advised (about 2 years ago) that 6mm was ok up to 16m, and I'm close to this, maybe a bit over.
I now notice that the cable gets warm (!); standard teenage daughter shower (30 minutes...) gets it warm enough to bother me. Full inspection of the cable, terminations etc shows no faults.
Looking through your site gave me a lot of info, but 3 questions.
1) should I go to 10mm cable ? 2) I have purchased a 30mA RCD - but after reading about 'nuisance trips' etc should I go for bigger ? 3) bathroom bonding is all ok, but one article recommends 'thickish' cable for the secondary bonding line back to the board. Do I then assume that the cable built-in earth wire ain't enough ?Any comments/advice appreciated.
FYI I am a marine electronics engineer and as such cover all the electrics on board (up to the 6.6KV stuff). However, we work to different regs - and basically just use armoured 10mm as a minimum size.
Thanks in advance Peter Owen