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You'll need to run another 3core+earth between the switches, and another switchdrop from the new light (unless you've got a loop-in switch type arrangement) You will basically end up with two separate two-way switching circuits. See diagrams here Whatever you do, don't just guess!

But I mean regardless of the 17th / RCD stuff, do you always supplementary bond without doing the tests to see if it's necessary? (this has not changed from the 16th)

Good point. Do you bond as a matter of course, or after doing the relevant resistance tests and finding it to be necessary?

Oh for the love of Pete, and the benefit of this forum, PLEASE give it a rest Banal. No one likes you, and your endless multi-quoted screeds are not going to help that, nor help people with electrical matters. It's Saturday; put your regs book down, turn the computer off, zip up your flies...

None at all, if all circuits in the bathroom are RCD protected. I'll say no more so as to not take up time you could be using to search for more info! :)

You'll need to hang the light fitting from a joist.

:?: :?: :?: A 1.5mm CPC is fine on a circuit wired with 2.5mm live conductors. If it's not, then 99% of domestic installations are non compliant, or do you think that enclosing the conductors in a bit of grey PVC magically changes things? :roll:

You get an empty box, fit it with a 40amp Double Pole RCBO. An RCBO combines the overcurrent protection of an MCB, and the residual current protection of an RCCB.

Something like this should do the job, fitted with a D.P. RCBO. If your mate's a spark, get him to bring his clamp meter around and check how much current that shower is actually drawing... Something's maybe not quite right here.

Which would be exactly the same on SWA if a TNC-S supply.

Which is absolutely ridiculous. Split-con is great stuff, what the IET were thinking of when they removed it from the17th I don't know. :roll:

Don't even get me started on how the air blowing lot have hijacked High Voltage Alternating Current... :evil:

When will you know if you got it or not? Good luck! If you don't mind my asking, what kind of salary are we talking here? :arrow:

Turn of the power before you do anything! Not just the lightswitch, but the mainswitch in your consumer unit! Looking at your photo, put the blue from the light in to the terminal block on the right (with the blue already in it), and the brown in the left hand terminal block (with the blue...

I can't see any photo there mate? Have a look in the sticky thread at the top of the forum - it has good lighting diagrams.

And stop surfing the net in work's time! :lol:

Take a photo of you consumer unit(s) and uploaded it to here please mate.

I must concur. I am ex-military, and I have friends who have worked for the MoD down in Portsmouth, and I have NEVER heard anyone refer to the "Department of Defence". :?:

Sigh. Have you actually read what anyone's said to you? 6mm cable on a 32amp OPD is fine. The only 'risk' is that the breaker trips if you're wanging the cooker full blast. - it's not going to burn your house down. But you seem to want to rip your house apart and shell out £££ on spark...

That's a whole big can of worms you've opened there Pinger (good username BTW) :) It has been discussed on here before: Are these so-called "maintenance free" JBs suitable for use in inaccessible locations? I'm saying nowt. :arrow: