Cable size

[driverman]

Not read all the threads, but SWA going though 2" wall shouldn't be a mess. Drill though wall at a steep angel ie 60 degrees.

 

[Guest125]

I have no means to scan the ground unfortunately, can you rent them?

Yes mate. Please do.

 

[uksparks]

Yes mate. Please do.

What is it I'm looking for? A cable scanner? Utility avoidance scanner?

 

[Guest125]

Just a thought if he does TT it, it is close to a metal clad building which is itself TNCS/PME and also likely to be bonded via the structural steelwork , your are not supposed to be able to touch two different earthing systems simultaneously, this can itself be a shock hazard due to the differences between true earth (TT) and the PME earth.

I don't know the reg number off the top of my head, and it may be a DNO rule, I would have to look it up to back this statement up.

it is a minefield eh?

It it is unusual for DNOs to provide earths to metal framed building is it not?

This is job may need a step back and reasses. Many heads are better than one.

 

[Guest125]

I really cannot spell on this forum.

 

[uksparks]

Not read all the threads, but SWA going though 2" wall shouldn't be a mess. Drill though wall at a steep angel ie 60 degrees.

I think I'm just a big shy of his shiny new office building that's all.

 

[uksparks]

it is a minefield eh?

It it is unusual for DNOs to provide earths to metal framed building is it not?

This is job may need a step back and reasses. Many heads are better than one.

Do you think it's worth giving WPD a call and asking what they think?

 

[davesparks]

Im going continuous now actually, you are not up to speed LOL.

It's hard to keep up to be honest, in the last thread about this you had decided to use a three phase unit and now you're back to single phase again. Now you're wandering off into the realms of whether or not it can be connected to PME or not and if it needs earth rods or not.
I thought you would have had this installation designed by now.

Where are you thinking of connecting the earth rods and why? What value of Ra do you need to achieve?

I'd personally be looking to comply with the requirements of (ii) in the list of situations where PME can be used. I can see the sense in divorcing the PME connection and relying on earth rods for one charging point when 99.9% of the time the PME will be fine, and the other .1% of the time the earth rods connected to the MET could benefit the entire installation.

 

[driverman]

Just a thought if he does TT it, it is close to a metal clad building which is itself TNCS/PME and also likely to be bonded via the structural steelwork , your are not supposed to be able to touch two different earthing systems simultaneously, this can itself be a shock hazard due to the differences between true earth (TT) and the PME earth.

I don't know the reg number off the top of my head, and it may be a DNO rule, I would have to look it up to back this statement up.

Should a metal clad building be PME anyhow? I thought not.

 

[Guest125]

This was my other part of the jigsaw, its too close, and I know its bonded as have seen it all inside against the back of the skins.

Hmm its not very straight forward is it.

I say just connect to the PME system, its too close.

Absolutly do do not approach it like this mate. If the neutral breaks down on the DNO side and someone goes to use the VC point then their body may well be the return path back to earth.

All together we can get there I am sure.