National Electric Safety Code

[steve66]

Would the NESC have rules and requirements that would apply to customer owned 4160 V switchgear and substations?

would it would cover things like grounding and bonding and overcurrent protection for 4160V in more detail than the NEC.

 

[infinity]

I'm guessing but since it's customer owned I would say no. We've installed 4160 volt transformers and gear within a building and the POCO had nothing to do with it.

 

[don_resqcapt19]

The NESC does not apply on the load side of the service point, no matter what voltage is being used. However, since the NEC does a very poor job with medium voltages, engineers often look to the NESC and other technical sources for guidance in the design and installation of medium voltage systems.

Not sure that it would cover bonding and grounding any better than the NEC.

They took steps to start improving the medium voltage content in the NEC with the addition of a number of new articles covering those types of installations in the 2023 code. However, there is little additional information in the new articles....really just placeholders for additional changes to be made in the next few code cycles.

 

[steve66]

Thanks for the replies.

I think it has been stated on this forum that substations require equipotentail bonding, and an equipotential ground plane. Where do those requirements come from if not from the NESC?

And why do utility substations require this grounding and bonding when typical utility pad mounted transformers do not?

Also wondering how this would apply to a factory substation that is installed in a penthouse and not on the ground.

 

[don_resqcapt19]

Thanks for the replies.

I think it has been stated on this forum that substations require equipotentail bonding, and an equipotential ground plane. Where do those requirements come from if not from the NESC?

And why do utility substations require this grounding and bonding when typical utility pad mounted transformers do not?

Also wondering how this would apply to a factory substation that is installed in a penthouse and not on the ground.

The bonding grid in a substation is typically used in the types of substations that have exposed medium voltage conductors and equipment, not where a fully enclosed pad mount type transformer is installed.