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As predicted we see more extensions and semi-permanent temporary tat-stuff as a result of part P, and in reality the overall risk rises not falls. Personally I think it is safer to break the law but do a well engineered job, if you must, but that is not the correct legal position.. SWA into a...

That large trip sounds very like an RCD, or an older voltage operated ELCB - if predating about 1970 it will be the V/O type - no longer approved as they do not offer protection against faults to true earth, only to the wiring earth - so in practice won't save you if you drop something in the...

I'm not forgetting it. BUT so long as the fuse or MCB protecting it is also too small, the fuse/ MCB thermal part will heat up, as will the wire, and then cut the power off. So long as the breaker or fuse protects the cable, it is silly but not immediately dangerous. Not the best user...

Can you temporarily supply the E7 water circuit from the non-switched side of your mains supply to confirm (during the day) that the element and circuit fuse etc are all in order, and if not how far power is getting? (with the E7 consumer units isolator, and all other E7 loads firmly in the off...

Sometimes an unzipping action is safer - it reduces the risk of nicked cores. Flay ends and pull apart. Only suitable for thinner flexes.

With the circuit dead, open up all the sockets and accesories it feeds, and deduuce the order of the daisy chain - this is the 5 days of test and measure to isolate fault. Also check is the wiring crumbling rubber - in which case it will need replacement, or PVC, and is it in good condition...

If the fan heater goes to a fused connection unit or similar, where an earth is present, in the same way as a light switch earth, then strictly that should be bonded in, either there or as near as possible- earthed screws on the box front and all that.. However, unless you are redecoating or...

So long as he fits the thicker wire and full size MCB/fuse together, or keeps the small fuse/MCB and thin wire and lives with the nuiscence tripping if he showers for long enough for it to warm up (likely 10 minutes plus), I suspect the risk is small. The only electricaly dangerous thing to...

he meant socket backbox with blanking plate over it, and no socket front, but the language is unconventional. In any case, use 2.5mm unless you can guarentee the load will never exceed the rating of 1mm in all conditions. good parctice to use 2.5mm anyway - it is what is expected.

I presume you have contacted your DNOs technical dept and described the installtion and got no joy, good luck with the regulator.. As regards your high earth impedance on socket circuits, if you can't win any other way, just RCD protect the ring - then the breaker can be B32, or even C32 if you...

If it really is 100 times slower than the 100watt lightbulb, at 5mA its probably the meters own consumption, and nothing to worry about.

Beware- the system could be close to tripping anyway, you need to check the RCD headroom if you can. This is done with a box of mains rated resistors which are switched in L-E to gradually increase the earth leakage until the trip just pops. If the headroom is not at least 10ma, then it may...

note also the resistance of a lamp filament is almost linearly proportional to absolute temperature (look up 'debye model' on wikipedia if you want the low down.) So at ~300K (room temp) it is 8 to 10 times lower than at opertional temperatures of 2700 to 2900K. Actually this cold inrush is...

As always, when you open it up, if its not absolutely obvious you will work out the true meaning of the colours with a meter, as we do now for 2 way switching etc. Fortunately the electrons are disspassionate about colour scheme. I await a NIC directive that all red wires should be sleeved...

Bell it out with a meter, but I'd assume it is 1 ohm to com, 1meg to com, etc. and you use these for checking your low and high resistance ranges on your meters.

The other method is an insulated incoming main switch, then split to two normal RCDs, one for power one for lights. This prevents a total darkness problem caused by a faulty applience. No earth should com near the live until it is downstream of an RCD. The earth rod impedance will be 20-100...

That is brown sleeving on new istalltions, and red on old ones of course, uless you print off and fit the 'mixed colours' notice to the CU, in which case brown and red sleeving can be safely mixed !

It does not need to be moved from a regulation standpoint, BUT if a little common sense tells you it is getting dripping wet and poses a hazard, then this overrides the minimum requirement of the regs, which is after all just that, a 'minimum' requirement. (Or if its the odd splash, a...

A normal 4 foot by 3/8" TT earth rod, driven into damp soil, will typically give 20 to 100 ohms depending on time of year and salt content. If the soil dries out, or the rod corrodes away, it could be in the high hundreds. AFIK the 0.8 ohm figure for TN-S is not a regulation limit, it is just a...

Kia, you need to look at the wiring when you go on holiday -only we use black-neutrals in the UK, and not any more in flexes , at least officially. Old east europe colours. red/black/grey => red earth, black live, grey neutral If this gets confused with old UK colurs it can be fatal, which is...