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Hi, The ground floor insulation resistance is very low, and the reading climbs slowly from about 1mo to 4mo. The flooding was bad, as the plaster is wet half way up the wall. Can this be a possible reason? The cabling looks in good condition (grey pvc, old colours) and I have unplugged...

Hi, This house has had its extensions extended, and now (apparently) the stop cock is somewhere under what is now the the dining room! I can find no evidence of main bonding to either the gas or the water, and whilst looking at the cobmi boiler (in the loft...) I noticed the main water feed...

Hi, In a loft, should junction boxes be left floating (i.e. between the joists) or secured to a joist? Thanks, Mike.

Hi, Can anybody tell me where I can buy 25mm armoured cable? All the places I know stop at 16mm. Thanks, Mike.

Hi, Is there any point looking at the ELECSA or NAPIT Part P schemes over NIC? Does anyone have any experience of them? Thanks, Mike.

Hi, How often do you come across a property with no main or supplementary bonding at all? The first two houses I have working on have been like this. I thought it was going to be a rare occurence... Regards, Mike.

Hi, House has an external meter and about 15m of pipe before it enters the loft, then the boiler. The bond should be at the point of entry, so is it OK to be that far from the meter? Thanks, Mike.

Hi, I am struggling to understand how a crimped connection provides a better mechanical and electrical connection than a terminal strip. With a double screw terminal strip you can overlay the cables and screw them down tightly. A crimped connection, with say a 1mm single core cable, seems...

Hi, A friends house has a meter on the outside wall, 60amp main fuse, then 16mm tails which run up the wall, across the ceiling, and back down another wall, totalling at least 12 meters! Is this acceptable? Thanks, Mike.

Hi, does anybody have an online document about how to make the perfect crimp connection? Thanks, Mike.

Hi, I have seen various threads on this subject, but never a definitive answer. I expect many of the more experienced of you have encountered this. When installing a new consumer unit, and you find that some or all of the cables are too short (not the tails), whats the correct way to extend...

Hello, how does one get an extension rewire (that has recently been comlpeted by a competent, but unqualified person) tested and certified by a NIC/NAPIT/ELECSA approved Part P Electrician? Is it possible? Thanks, Mike.

Hi, I have a suitable light fitting located in zone 3 of a bathroom. As its a TT system, the light circuit is on a 100ma RCD. I am told that a fixed light fitting in zone 3 of a TT system has to be on a 30ma RCD. Is that correct? Many thanks, Mike.

Hello, I have a standalone solid fuel boiler (giant cast hunk of steel that sits directly on the concrete in the kitchen) that feeds my rads. Should the water pipes be main bonded back to the CU? There is a stainless chimney that goes outside at headhight, and this will be at the same potential...

Hi, wonder if somebody could advise. The Robin Domestic Installation Certificate asks for both the 'Electrode Resistance' and the 'measured Ze'. If I am using a simple Fluke 1651 multimeter to test the Electrode Resistance (between phase and the earth rod), the 2 figures will be the same wont...

Hi, If you have one, can you tell me if you should short the earth and neutral probes when measuring Ze? The instructions dont specify...which I assume means you dont? Many thanks, Mike.

Unlike main equipotential bonding, where the cable must be a single unbroken run, am I right in thinking that this is not the case for supplementary bonding in bathrooms? I.e, I can run a 4mm cable from the light to the radiator, then a separate 4mm cable across all the other relevant pipes...

Hello, I need some advice on changing my supply from TT to PME please. After several pointless calls to my service provider I am none the wiser. They advised me that PME was available in my area, asked if I had a plastic fuse holder (which I do), and told me I could do it myself!? I am a...