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Was the old unit a timed fan. It may have been wired to L1 & L2 at the switch with a neutral. Ie you have the fan connected to the light off side of the two way switch. As was sugested above you need to trace the wiring back. Please be careful to doing this. Isolate the lighting supply at...

What type of power saw are you using - is it a workshop type with an induction motor?? It would be helpful it you could describe it and how it is connected a but further. Does it trip immediately of after a few seconds/minutes? Induction motors can have large in rush currents and need...

My gut instinct bearing in mind the existing fuse box has only 6 ways, 30 Amp shower circuit - no mention of an RCD to protect it or the downstairs sockets etc is that it is probably an installation predating 16th edition of the regs (before 1991) and as such there is no harm in getting a...

Of course you could connect it up the wrong way and provide an alternative method of gassing yourself :lol:

Dingbat obviously types faster than me - but I think we are saying the same thing

Hi, Quick terse answers/questions sorry. 1) What was the cable used for? What was left at each end of the cable when it was removed? I'm assuming it wasn't a fire or emergency circuit? 2) MICC cable needs special terminating (& tools) and is very sensitive to moisture. 3) Unless its...

Firstly it is not advisable to join the lighting circuits together there may be (a) be too much load for one circuit and (b) if the fuse blows you loose all your lights. Also you cannot share a shower circuit with anything. I'd advise you to consider an entirely new consumer unit. However...

I agree with BAS. This area seems open to too much interpretation. Regs state diversity can be allowed for by a "competent person" but there are some suggested formulas/values in table H2 of GN 1. Now if we use these figures/formulas as BAS did in his example we often arrive at a value of over...

Box cutters are excellent in softer materials. In tougher brick mine usually cuts the round whole without problems but you need to square the it up with a chessel rather than the box cutter. However its less mess than a angle grinder/ cutter. If you are going to do lots of boxes its worth...

GN 1 states immersion heaters SHOULD (not must) be supplied by a separate circuit. (They must not be on a plug though.) I've got a very similar arrangement in my own home. Its not ideal and I wouldn't have wired it that way myself but as its only used as a back up to a Gas CH system is it...

BAS's installation sounds pretty standard and i'm sure there are many out there with exactly this type of arrangement happily working on a 100 Amp CU. How can you reconcile a 134A Max demand after applied diversity on a 100 Amp Cu? Are the sugested diversity figures in the regs wrong or...