11kv transformer and bonding to gate housing

[i=p/u]

If 185mm supplying would my bonding required be 95mm to gate ,housing the transformer?

 

[i=p/u]

Uhooooo do I know what I on about

 

[Guest55]

private or dno transformer ?

edit ; thinking about it , it must be a private TX otherwise dno would fit their own earthing.

as posted below , WTF ? lol.

 

[markythesparky]

Wtf!!!

 

[capitolltd]

If you are taking about bonding the gate or fence surrounding the TX, then UKPN stipulate 70mm2.
You need to look at the earthing configuration between HV and LV. If they are combined at the TX, the surrounding coupled earth electrodes need to be below 1 ohm (before cables are connected) to limit the touch voltage being imported into the LV installation, in the event of a HV fault.

 

[Knobhead]

You need to read up about 3rd party substations.

 

[i=p/u]

Well I've never ventured this far before , but we working on old barracks and have to bond the gates with transformer , one guy said 95mm as is 185mm conductors which I thought woooo , and the cherry dropped

 

[i=p/u]

Isit bs 7430 I should be looking at, il be deciding nothing just doing it

 

[Knobhead]

i=p/u, have sent you a PM.

 

[Engineer54]

If you are taking about bonding the gate or fence surrounding the TX, then UKPN stipulate 70mm2.
You need to look at the earthing configuration between HV and LV. If they are combined at the TX, the surrounding coupled earth electrodes need to be below 1 ohm (before cables are connected) to limit the touch voltage being imported into the LV installation, in the event of a HV fault.

That 70mm size would be minimum.

Never seen a combined MV/LV earthing system on a TX sub-station combined, and for very good reason!! Not saying that it's never done, but it's not something i would ever contemplate doing!! lol!!

 

[Bobster]

It's done with nearly all our on site Txs E54.