Bonding conduit to cable tray

[dwmccleney]

Does the NEC allow using the cable tray to be used as the system grounding conductor when bonding conduit to cable tray? The specs on my project state that each metallic conduit run shall be solidly grounded to the station grounding system.
That tells me, the conduit grounding bushing needs to be tied into the 4/0 ground conductor andnot just bolted to the tray.
Anyone have any input?
Thanks in advance.

 

[Gategator37]

I am not an inspector but it sounds like you can according to 392.3(C) in the 2008

 

[dwmccleney]

Thanks for the reply. After reviewing the section you cited, I wish I could edit my question. The contractor is using corn-clamps to secure the conduit. Not LCC's. I don't believe corn-clamps are UL listed as conduit to cable tray clamps, even though they do connect it solidly.

 

[Gategator37]

I'm sure they make something for that type of installation, but have not seen it.

 

[dwmccleney]

I'm sure they make something for that type of installation, but have not seen it.

LCC's are designed to connect conduit to cable tray. If you use those, you don't need grounding bushings and all that.