Taking cables from a house to a garage

[spinlondon]

Do you actually read other posts? I stated above that the word premesis refers to land as wellas buildings so that means as soon as the cable is on your land it is in the premesis. I think if you read the regulations properly too you will notice it actually states as close as possible ON THE CLIENT SIDE of any meters or stop taps.

I have read the posts, and if we are to bond extraneous-conductive-parts as near as practicable to point of entry to the premises, then I would assume that a trench would be needed to expose the water, gas or oil, so the bond can be placed as the services cross the property line.

How that would comply with the requirement that connections are accessible for I&T, I don't know.

 

[ianmacd]

I really cannot see problem with TN-C-S its used by most dno and I have never heard of anybody being injured because of it. I will always use pme earth if available. To me its better than TT I have seen more unrealible earths due to TT than TN-C-S.

Yes but the whole installation takes that into account unlike a TN-C-S. Loose a Neutral and nothing will work on all of them (with plastic incommers) but unlike TN-C-S the others won't send all your bonded metalwork live.

 

[ianmacd]

I have read the posts, and if we are to bond extraneous-conductive-parts as near as practicable to point of entry to the premises, then I would assume that a trench would be needed to expose the water, gas or oil, so the bond can be placed as the services cross the property line.How that would comply with the requirement that connections are accessible for I&T, I don't know.

No as, again its after any insulating pieces, meters taps etc.. If there was a branch under the ground before it entered the building then you would be correct. If it was an oil supply from a tank on your premises then that could be done at the point of entry into the building as its never been outside the premises to enter it again.

 

[ADS]

And right back round in a big circle

Yes but the whole installation takes that into account unlike a TN-C-S. Loose a Neutral and nothing will work on all of them (with plastic incommers) but unlike TN-C-S the others won't send all your bonded metalwork live.

Which is why an earth rod, connected to the MET, at the beginning of the installation is a good idea - to divert that neutral current to earth and not send your bonded metalwork and class 1 fittings live - I know which situation I'd rather have, especially if I had no extraneous conductive parts.

 

[Andy™]

And right back round in a big circleWhich is why an earth rod, connected to the MET, at the beginning of the installation is a good idea - to divert that neutral current to earth and not send your bonded metalwork and class 1 fittings live - I know which situation I'd rather have, especially if I had no extraneous conductive parts.

an earth rod will not reduce the voltage to 0v. but at least it wont be the full 230V (possibly higher depending on fault)

 

[PBC_1966]

Sounds good until the DNO refuse to connect it just because they can

I really can't imagine the DNO refusing to connect power because I have an earth electrode on my system which is going to be linked to their neutral. Why would they?

Half the time on a new system these days the DNO has installed the service head and gone before the rest of the installation is ready to be hooked up by Siemens (or whoever) acting for your chosen provider anyway.