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Fitting a space saving semi-recessed sink into a narrow vanity unit and needing some advice. Have cut the front panel neatly and about to cut the worktop but just realised that the back of the sink will almost come to the back of the unit. This gives me two problems: a) the cut leaves a very...

Lots of simultaneous posting, thank you all for your interest and advice! I will ask the electricians about both of these when I next see them, hopefully sometime this week.

The grey core to clarify.... The SWA is 4-core (blue/black/brown/grey), the grey core is unused and simply tapped off at either end, just out of shot in the photo (sorry). At one time this extra core was also attached to the earth at the meter box end but not the other, this was changed...

It does have a small square with an "S" in it next to another with a "~", guessing that 6027 11 is the part number. Is Legrand one of the better makes? OK, here is a picture of what is in the meter box. Does that look right, or are there issues? Appreciate any advise.

Sorry, I got my facts a bit muddled. :oops: The offending RCD was a 100A 100mA time delayed RCCB (not an RCBO) from Control Gear Direct. To reprise: the CU is made by Control Gear Direct, badged as Curve by Denmans, populated by 30mA RCBOs by same. The entire TT system, including 8m of...

Selected by the electricians, what is the issue? Unfortunately it is not an area I know anything about, but how can a box and some terminals be an issue?

Yes that's it, CU made by Control Gear Direct, thanks TTC.

Thanks for taking an interest John Happened with just one RCD in the CU (that did not go) running a couple of sockets, so that suggests not multiple leaks. Checked supply cable thoroughly short of replacing it which would be difficult. Sorry don't know, has a logo of black disc with red...

System is TT with a metal CU, I was told that 2A could flow in the case without blowing the DNO supplied fuse, hence the trip before the CU (also protecting the cable run as well). Time delayed for discrimination between the 30mA RCDs in the CU. Pretty sure it is an RCBO (not just and RCD), the...

Just to update things I have had the insulation resistance of the buried cable checked, and the connections either end, all look fine. All kinds of checks on the internal wiring showed nothing unusual. I remain convinced that the problem is the other side of the CU, but the SWA does not seem to...

It could come to that but such a temp supply would have to run in through a window as well as across a room and passage way. Also it can be days between trips, so it is difficult to know if the problem has been fixed, already had several false dawns. Really need to be able to measure the...

The meter box got very wet some months ago, someone left it flapping open, but seems dry now and is enclosed in extra cladding. SWA does seem tough stuff to damage, no idea why the contractor insisted on using it, the duct is 400mm below floor level set into the substructure below the slab. The...

Will ask for that, thanks. There were difficulties threading the SWA cable into the 110mm ducting, along with a phone cable and a 25mm alkathene pipe, the cable was much thicker than I had expected, a 4 core armored monster! Maybe it was damaged, but not going to pull it out and redo it in a...

For the power installation on my new build the meter tails and CU are protected by a 100mA RCCD in the meter box. From the day the site was energised this has randomly tripped, often working fine when reset. The electricians have blamed the weather, the equipment in use at the time, the earth...