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Assume that somebody will unwittingly try to switch on, so make safe somehow. Isolate with JB as you suggest, Remove Fuse, Disconnect in distribution board, Lock Off, upto you.

Hi Andy, Yes, if the 100mA SType trips that is true, but the likelyhood of that happening becomes minimal* since most faults will occure beyond the RCBOs. None the less you have a very good point. I suppose I am confusing the requirements of Ed15 on which I trained with the current regs. It is...

Hi John, Sorry if I have missed your point. I try not to do that. What will happen at 0.25Amp? the RCD will blow within 40mS. Seems too obvious, what have I missed this time? Geoff

Yes I concur with the loose connection, hence the tapering off of the discouleration, but even that would require a substantial current. It would be worthwhile looking round the night storage heaters to check their total wattage and voltage ratiing, which by law must be attached to the unit...

Probably too late now but I agree absolutly with Sharpend. The demand from the Central Heating Nest goes to the demand on the Honeywell (left) controller (Brown) NB on these valves Grey is permanent live. The dedicated controll box will have a demand input which is connected to the other Nest...

Of course it depends on what edition of the regs you believe the installation complies with. And if the light is inside Zone 2. And if the light is IP44/45. In most instances I would agree with Luckboy. However if it were a pendant hanging in Zone 2 (ie if somebody standing in the bath could...

There are many comments on why not to contact Check-a-Trade (with which I agree), but few on where to go! I would recomend NAPIT or NICEIC who each run a register of their approved electricians. You might also goto Nextdoor.co.uk and ask your neighbours if it operates in your area.

Not to detract from the point that you are really making (that the earth needs to be an earth and not just a floating wire). I am told that the reason we have 32mA RCDs or RCBOs is that this is the limit of current that a person can withstand for a period of 40mS that would cause a fatality. I...

A very interesting setup, and after an hour studying the photo I still cannot make out all the connections. The first point is that under modern regs the earth cable for a TT supply, assuming protection against corrosion, need only be 4mm if unprotected (2.5mm if machanically protected) so if...

Thank you all for your comments.  I am well aware of the need to apply diversity, but this is the first hotel design I have done and the figures did supprise me.  That is why I asked for anybody with hotel design experiance to give me a sanity check.

No, hot water is by gas.  The figure per room is taken from a respected study (can't remember the name off hand) and works out to 2.3 to 2.9 amps per room with diversity applied.  The big guzlers are the kitchen with oven at 90Amps dishwasher at 30Amps and three toasters at 12Amps each, thats...

Have you designed hotel electrical systems?  I am in the mids of such a design but am finding that, even with diversity applied where possible, the total load is cumming up as 1400Amps for this 80 room hotel.  From your experiance is this reasonable?