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Are you referring to a main isolator that's connected in-line with the tails? There's copper showing outside of the enclosure? Is the other part you're referring to the DNO's cut-out? If there's a problem with that then you need to speak to the DNO on the customers behalf or ask the...

The top surface of a consumer unit or distribution board etc should have an IP rating of not less than IP4X which means it should be protected against the penetration of a test item of not more than 1mm diameter. The underside would be subject to a minimum rating of IP2X so protected against...

Just for information, the set you have will be Extra-Low Voltage (12V AC), not Low Voltage which includes 230V AC. Voltage, nominal. Voltage by which an installation (or part of an installation) is designated. The following ranges of nominal voltage (rms values for a.c.) are defined...

Yes for the line and neural conductors and a blue (2.5) for the CPC.

We use Wago connectors all the time but up to present only on lighting circuits and low current circuits. I know the connector you linked to is rated at 41A and should have been tested to carry that current so I guess I should have more faith but I'm struggling!

I'm not sure I'd trust a Wago connector but the one picture is designed to take up to three 6.0mm² conductors and is rated for up to 41A.

No problem at all, glad you're sorted.

Really not sure. I don't have a copy of GN8 (Earthing and Bonding) but I do wonder if that could shed any light?

Most likely brown to 3 and blue, sleeved brown to 2 for a NO (Normally Open) connection.

OK, you take 544.1.2 to definitively mean that under all circumstances a protective bonding conductor should be installed to incoming services. Do you also accept that protective equipotential bonding is solely in place to ensure all incoming extraneous conductive material is at the same...

Same stands for a plastic water pipe entering a property with a resistance between the copper side and the MET being over 23Kohms. In reality though, most will bond, rightly or wrongly and that way there will be no come back. Still, it's worth a debate.

The OP's situation, as I understand it is he's had a new gas main from the road to his external meter cabinet, from the meter is copper, including the section entering the property. If a resistance measurement was taken from the MET to the copper pipe entering the property I can see it being...

Well, it comes down to how you interpret BS7671 and how capable your are of thinking logically. The ECA document would have been written, had input from and have been approved by many electrical engineers who know a damn site more than you or I.

Yes, may not.

Have a look at this PDF - http://www.eca.co.uk/filelibrary/download/?FileID=1284 Specifically Page 3..... Requirements for Main Protective Bonding Conductors What is Main Protective Bonding? Main protective equipotential bonding connects the main earthing terminal with the following...

I stand by a plastic gas pipe not introducing a potential from outside of the equipotential zone though the same may not be true for water. Obviously it's to be confirmed by measurement. If the reason for bonding internally is to keep internal services at the same potential then surely that's...

Place green/yellow sleeving on the exposed copper conductor at the termination, the rest will be covered by the outer grey sheath.

So the internal non-extraneous gas pipework which gains a low resistance connection to water pipes via the boiler should be treated as extraneous and bonded? If youre not treating it as extraneous why are you suggesting it should be bonded? Because it gains a low resistance connection to the...

How can it be extraneous when it's not introducing a potential by way of a plastic supply?

OK then, is his pipework an exposed-conductive-part or an extraneous-conductive-part?