Bonding and Grounding at a Bridge

[NEC User]

NEC requires bonding and interconnection of all metal parts that are likely to be energized. Is bonding and grounding of a large structure like a 2400 foot bridge with a metal main span truss required by NEC? I'm working on a lighting design for an existing bridge. I'm not positive if the existing bridge is grounded, likely it is though right? I am considering recommending a bridge grounding plan, not just for the main span truss area, but for one side of the bridge to the opposite side. Any thoughts?

 

[raider1]

Is the bridge supplied by an electrical service?

Chris

 

[NEC User]

There's two load centers, one on each side of the bridge. There's only roadway lighting on the bridge. The bridge does not have any electrical components or moveable parts to raise and lower the roadway. You do raise a good point that I didn't consider.

 

[NEC User]

Does this mean I should provide a bonding and grounding plan for the bridge if one doesn't exist?

 

[north star]

: - :

What entity has oversight of the bridge [ RE: Article 90.2(B)(5), `08 NEC ] ?

: - :

 

[whiggins]

AASHTO does have some standards for electrical on bridges. Here is a link to the Wisconsin DOT information. See chapter 48.
http://on.dot.wi.gov/dtid_bos/extranet/structures/bridge-manual/index.htm


The AASHTO standard for movable bridges has more detailed requirements.