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Thanks, its in an office which is basically the size of two large living rooms separated by a short hallway. They are refurbishing the office in two stages and are wanting a new consumer unit in the new half, leaving the existing installation in place in the old half. I was more confused...

Hi all, for purposes of certification, would a new (additional) consumer unit count as a new installation or an addition to an existing installation. Eqipotential bonding is already in place and sufficient. Many thanks. P.S. total newbie to certification

The latter

Hello, I took some more measurements today, from the CU main switch, I was still seeing a 9v drop when the shower was on load. I also took a L-N loop measurement which was 0.18, it's a TNS system, not sure what's typical. But would that not account for the volt drop on the supply? I...

Thanks for replying. Would the resistance not be between the origin of the supply and the CU incomer rather than just between the cutout and the CU incomer? I must say that the tails going into the CU do look poor, they have been oversleeved with heat shrink but from what I can see look...

Thanks, will stop obsessing now :)

Hi there, At time of testing shower took me from 245V down to 235V. Just tried the kettle and it gives a proportional 2V (approx) drop. Not tried the Hoover, will have to get the missus to show me how it works! It's an underground supply btw. Cheers

Hello, When we turn the electric shower on (10.5kW) it causes any filament type lamps in the house to dim. I've measured the voltage at one of the sockets and when the shower is turned on it drops by approximately 10V. Do I have a problem? I've done a search on the forum and there are a...