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OK, thanks. Mike.

I agree. No reg reference (not helpful). I cant find anything that relates either. Regards, Mike.

Thanks, I didn't think so either. My 'Practical Guide to Testing...' states that "any current using equipment in a TT system in Zone 3 requires 30ma personal protection". Regards, 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.

Many thanks.

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...

Thanks for the confirkmation. So both boxes on the certificate would have the same entry? In this case 10 ohms. Regards, Mike.

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...

Doh, answered myself by ringing Fluke. You dont short the neutral and earth, as per suggestion in my 'Practical Guide to Inspection / Testing'...

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...

Thanks JohnD, I will go down the letter route.

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...