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In my house, the mains supply comes in as two cables, into the service head. The main earth comes from under the floor along with them and straight into the consumer unit. The unit is then bonded back to the steel outer sheathing of the two incomers. What type of system is this?

Well yes but the question is, if we can test R2 with a wander lead then why do some people say we have to test R2 against L1 L2 and L3 on a 3 phase system? We're literally only using the line as a wander lead, so should be able to just use one of them to prove CPC continuity. What's your...

The point of the R1 R2 is to verify continuity of CPC no? What happens if you use a wander lead on the test instead of using a line as a lead?

If we are testing the continuity of the CPC, what's the point in testing between all three phases? Someone at work insisted upon it but i don't see the point. Was told it was mandatory as there were three phases but we're only using the phase as a wander lead. I asked well what if we simply did...

Glad it's not just me being thick which is usually the case.

It kinda annoys me that we have to pay so much money for these publications and yet there are loads of errors in them.

The picture doesn't show them connected together. For the line to neutral test it shows live to earth bar. For an example check OSG page 118 or GN3 page 69. Same picture. All i can think is that the neutral and the line are both in an RCBO and somehow that makes them all connected?

On page 69 of Guidance Note 3 it shows a picture of a test of a whole consumer unit for Insulation Resistance. The info for the test says it shows 'an L-N test' but in the picture it shows one probe in the L of the main switch load-side and one probe on the earth bar. Is the guide wrong or am...

I do a lot of solar and have had a belt whilst in a loft..

Now i'm confused. I've seen people in the 3rd floor of houses, wearing shoes, standing on floorboards, get a belt off a socket or light fitting. Surely you're not saying that we can simply wear rubber soled shoes and stand on insulated flooring and are now impervious to shocks?

My point is why would he need to touch the water pipe for him to get a shock? He's already on the ground himself so it's not like touching the water pipe is suddenly grounding him. He's making it sound like you can touch something at 240v potential and be fine as long as you don't touch...

There is not a salary big enough for me to do that as a job.

But he's already at 0v because he's stood on the ground, so why would it be necessary for him to touch the pipe before getting a shock?

The guy in the video is saying if we remove bonding from the water pipe, and there's a fault, we will then get a potential on anything that's metal and if we touch the metal object and the water pipe we'll get a belt. But isn't he at 0 potential anyway and so touching the pipe is irrelevant...

Thanks guys

So in a situation like he describes, how do we tell the difference?

Inverters use a tiny bit of AC to run.

In this vid he shows a TNS with a 3 core incomer and the other 3 standard types (TT, TNCS, TNS with sheathing earth connection) How can we identify the difference between the TNCS and the TNS with a 3 core incomer? Seems to me that both will have an earth coming out from behind the capping on...

The inverter uses some energy just to stay on don't forget..

In addition to this, Page 237 says additional protection requirements must satisfy chapter 41 (where the previously mentioned table is) which says 200ms is the max disconnection time for an RCD on a TN system at 230 nominal, but yet goes on to say that 300ms maximum is the disconnection time...