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This is quite normal and should dissappear quite quickly. When the parts are made they will have oil residue etc on them which will burn off during first use. The manual usually states this.

What size fuse or MCB is protecting the 1mm cable?.

How have you earthed the steel armour?

Damn, must type faster!

Black isn't a neutral, it will be switched live. Red to C, put a piece of brown sleeve or tape over the black and connect to L1. Earth to earth as you said.

Before you get too carried away, with the power turned off unscrew the switch from the wall and see what cables there are at the switch. If there is no nuetral you will need to take a feed from the nearest ceiling rose.

As it is a bathroom everything you mention will require 30mA RCD protection.

I think you will find that building regs now state 100 watt maximum for floodlights.

I hope you didn't pay him then if the job isn't completed yet.

B-A-S. You'll be telling me next the "professional" who installed the shower wasn't actually an electrician!

You can't just change the mcb without first identifying what size cable you have, how it has been installed and measured the EFLI of the circuit. Get your professional back to put in the correct size mcb as stated in the MI and retest your circuit for you. If you change the mcb yourself then you...

Do the manufacturers instructions say it needs an earth connection? Is there a picture on it of a square inside a square?

PIR before board change, board change and then final testing and certification in 3 hours???. I must be doing something wrong. Please get your electrician to let us in on his secret!

Either connect 2 core cable to your existing choc block then to the new fitting or remove your choc block, connect the neutral and line to your new fitting then put the earth from the T&E to a single choc block (don't forget the earth sleeve).

Famous last words!! Make sure you make a note of where all the wires are in the current fitting before disconnecting it.

Is the garage attached or detached from the house?

By the time you have messed about with the trunking you may aswell use T&E. No registered spark can sign your work off for you.

A question to all you domestic electricians. When carrying out a pre works survey for a consumer unit change, apart from going in the loft and tracing cables is there a simple check for shared neutrals on the lighting circuits prior to quoting?. Fortunately I haven't been caught out yet but I...

From your diagram the socket which has the burner and pump plugged into only becomes live when the heating is on via output from terminal 6. When the hw is on the only thing getter a supply is your other pump at the bottom of the picture via terminal 5. Where is your 2/3 way valve and how is...

45A rated cooker, where did you get that information from?