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Nominal voltage (U) what is it 230 or 240v? (Uo) what is it 230 or 240v?

Should a shop which has a flat above have both CUs in the shop fed from 1 main fuse, but with two meters and two boards? I think that it would be against regs as what if needed to isolate circuit when shop was closed? What if mcb tripped out how could turn back on? Opinions appreciated!

If a dwelling does not have CPCs on lighting circuits, installed before 1966, can the circuits be extended to add more lights or does earths have to be added to the circuits?

This may sound daft, but when changing fluoro lamps is it required to fill in a MWC?

Been to a house today which seems to be supplied with 16mm earth from next door! It has no clamp for TN-S or no PME supply. Would it cost for supply company to supply an earth or is it a case of putting a clamp on the lead sheath of supply cable, which indicates to me it was a TN-S at some time...

On Niceic EIC it says designation of consumer unit, what is written in there? Its the 1st time i'm filling one in thats all

I replaced a MCB with a RCBO today for socket circuit in small factory unit. I tested it all and it was fine. After i left there was a bang in the CU and the power went down, blowing two of the three main fuses (3Phase). Upon investigation there seems to be soot on the new RCBO which is red...

Just been to house to add 3rd switch to landing light circuit. Thought would be easy simply adding 3core and intermediate switch. But when opened both swicthes up, upstairs and down, both only had 1 wire in each of the 3 terminals, instead of 2 wires in L1 & L2. How can i add the 3rd switch...

Will this fit in the old merlin germin c45n place? http://cgi.ebay.co.uk/Merlin-Gerin-RCBO-BNIB-C60HC32R30-30A_W0QQitemZ250151074527QQihZ015QQcategoryZ26215QQssPageNameZWDVWQQrdZ1QQcmdZViewItem Any advice welcome

Come across a S/O which has cables from ring into connector block then 2.5mm TW&E from CB to S/O as cables from ring are too short. What number would this be on a PIR and is it dangerous or against regs? Is it just treat as a radial?

Come across a blanking plate today about 100mm sideways from a sink in a cloakroom but a good 400mm from it diagnally. behind it was a connector block feeding a boiler from the ring. Obviously this needs fusing down using a FSU but is it allowed inside a cloakroom? If so how far away from sink...

Is it ok to upgrade main bonding from PME to CU with 16mm Cable simply by isolating supply then making connections at CU then to the PME earth terminal?

Is there a height at which a new CU in a rewire HAS to be?

If there's a hole behind a CU which the cables comes through should this be sealed up? I mean when they are pushed through cavity from meter box. If so what should it be sealed with, is loft/cavity wall insulation to fire reg standards ok?

Is a fsu allowed inside a bathroom? It is supplying a boiler, which is going to be enclosed inside a cupboard. It is not on a rcd

Does Water incoming have to be bonded if pipes from it are plastic? What about if further up the line the go back to copper? Problem is the stop cock comes under floor which is tiled and into wall which is tiled, with only the turny bit sticking out. Would the tiles have to be taken off and half...

Which form would you use to install 9 spotlights in place of a ceiling rose? I use a MWC but is that correct or should it be a EIC?

Is it ok to have a 10mm main earth if the phase and neutral are 16mm on a TNCS system?

I found some earths today with red or black sleeving on instead of the usual green/yellow, do i note that as a departure or in comments on existing installation?

When installing a new CU, is it ok to determind R1+R2 by Zs-Ze? Is that ok to write it on EIC?