Insulated Ground

[dnbob]

Would an equipment ground be required to be insulated if direct buried and part of a 4 wire single phase feeder?

 

[iwire]

Would an equipment ground be required to be insulated if direct buried and part of a 4 wire single phase feeder?

Copper yes, AL no.

 

[dnbob]

Vice Versa?

 

[jumper]

Vice Versa?

Yes. AL will corrode if uninsulated and buried, copper will not.

 

[dnbob]

I have never run bare for equipment ground, except in a raceway.

Thanks for the help.

 

[iwire]

Vice Versa?

No, you cannot direct bury bare AL

250.120(B) Aluminum and Copper-Clad Aluminum Conductors.
Equipment grounding conductors of bare or insulated aluminum
or copper-clad aluminum shall be permitted. Bare
conductors shall not come in direct contact with masonry or
the earth or where subject to corrosive conditions. Aluminum
or copper-clad aluminum conductors shall not be terminated
within 450 mm (18 in.) of the earth.

 

[jumper]

No, you cannot direct bury bare AL

Yes, but look at post 2, you said the opposite by mistake.

 

[iwire]

Yes, but look at post 2, you said the opposite by mistake.

Are you trying to say I was wrong? :rant::rant:






Well you are right. :ashamed1:


I was answering which could be buried when the question was which needed to be insulated.

 

[Tony S]

Look up galvanic corrosion of aluminium in subsoil. It makes interesting reading.