Bonding of metal carport

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rickcham

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I need some advice on bonding of a metal carport, this is set in a concrete pad and will have lights and a few outlets all gfci.
I was called after the concrete was poured so a UFER is not possible and I cannot find anything in art 250 other than 250-104 for the bonding of structual steel.
I planned on a bond #8 copper from the panel to a few of the metal columns and then to a ground rod.
Any suggestions are much appericated.
 
Re: Bonding of metal carport

Ryan

I am using the ground rod as a addition to the panel GEC, In Virginia we are using the 99 code I could not find your refered article.

Rick
 
Re: Bonding of metal carport

Rick,
When you refer to the "panel", is this the service disconnect enclosure? 250-104(d) lists several items to which structural steel may be bonded. The service equipment enclosure is one of those items. But, if the panel you mention is not the service equipment enclosure, it is not on the list. Also, have you checked Table 250-66 to see if the #8 bonding jumper is large enough based on the size of the service-entrance conductors?

As Ryan has mentioned, adding another rod will not aid significantly in clearing any ground fault. It would however be permissable if done in accordance with 250-54. I assume the building already has a grounding electrode system.
 
Re: Bonding of metal carport

Hi Rick,

You asked about "Bonding". However you went on to describe "grounding".

Bonding of the carport would take place when you connect your EGC, brought to the carport with your phase conductors, to the metal structure itself.
 
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