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Need I say more

http://www.diynot.com/forums/viewtopic.php?t=7553

He is talking c**p. Ask him to put it in writing then contact trding standards. What you could do is 20A mcb 4 or 6 or 10 mm cable (future proofing) 45A CCU. The 45A is not actually reuired a 20A double pole switch would suffice, but again future proofing.

But ensure that the earth fault loop impedance is not too low as to cause the prospective short circuit current to be too high for the protective device

You need to stop assuming things and use your multimeter to find out which cable goes where. Remember that electricity is dangerous and should not be tampered with willy nilly.

From these very basic questions, I will challenge that statement. If he really is then I must be a nuclear scientist

will you be using USB 1 or 2?

Since you demonstrate that you clearly do not understand the very basics of electrical theory, my advice would be to get someone in who does understand

INSULATION RESISTANCE TEST IS STILL REQUIRED

since it changed overnight (more likely that it happened when you switched the landing light off upstairs when you went to bed). This sounds like a fault on the strappers or maybe even that the landing light live is fed from the downstairs circuit and the neutral is fed from the upstairs...

note the highlighted bits and then comment on what you see

method 1.Using your multimeter or other suitable voltage detecting device, find out which cable is the permanent live and which is the switchwire. method 2. With the power off use a suitable continiuty device and find the switchwire method 3. Keep playing around with wres with the risk of...

........and test the insulation resistance, polarity, earth fault loop impedance, prospective short circuit current, voltage, current usage, tripping times, heat dispersal, safe routing, fire barriers etc

The circuit needs to be tested using an insulation resistance tester, earth loop impedance tester to name two. When you have done this, post your readings on here and someone will be able to help

Strange reply. Waht a great film that was that is correct Could be correct but needs confirmation using an appropriate meter Never assume anything when it comes to something that could potentially kill you. This needs confirmation using an appropriate meter do not understand...

The regulations that you require are BS7671 and the Building Regulations. What is a standard toilet/macerator?. I have searched and found loads of different ones.

what level of lux do you require in that room?

Conduct an insulation resistance test on the circuit and if ok conduct an earth fault loop impedance test on it. If both test prove satisfactory then come back with your results and someone will be able to help.

All 4 wires fell out! The installer must have had weak hands. Are you sure that you are telling the full story.

If you know everything that is required, why bother employing a professional?. If you have got a professional, why not just let him get on with it?