Parallel conductors in Cable Tray & Eqpt Grn Cond's

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Ragin Cajun

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Upstate S.C.
250.122(F) addresses "conductors are run in parallel in multiple raceways or cables . . .). We will be running four sets of 350MCM using single conductors tye wraped into four, three phase bundles in a common cable tray. There is some debate whether or not each bundle needs an EGC or one for the set of four since they are in a common cable tray. I also have a picture showing where this has been done previosly at the site. Two of us agree that, as shown, it's acceptable.

Commants?

Thanks,

RC
 

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One ECG sized for the parallel sets of cable is all that is needed. (If you run one at all)

Think of at being similar to running a parallel set of wires in a single conduit.
 
Ragin Cajun said:
250.122(F) addresses "conductors are run in parallel in multiple raceways or cables . . .). We will be running four sets of 350MCM using single conductors tye wraped into four, three phase bundles in a common cable tray. There is some debate whether or not each bundle needs an EGC or one for the set of four since they are in a common cable tray. I also have a picture showing where this has been done previosly at the site. Two of us agree that, as shown, it's acceptable.

Commants?

Thanks,

RC
Click to expand...

Good to go! I would rather see a full vertical bend than an adjustable splice plate at the vertical transition. I see that they are using two different tray systems and definelty dont like the pressure that the sharp edge of the first vertical rung puts on the cable insulation. Asking for trouble. This would not happen on proper vertical transition done with fittings.
 
Last edited:
weressl said:
Good to go! I would rather see a full vertical bend than an adjustable splice plate at the vertical transition. I see that they are using two different tray systems and definelty dont like the pressure that the sharp edge of the first vertical rung puts on the cable insulation. Asking for trouble. This would not happen on proper vertical transition done with fittings.
Click to expand...

I agree with LW,not a good design, even if i was done before.

dick
 
The DLO cable used is CT rated, RHW-2 or RHH(UL), EPR Insulation, CPE Jacket, Flexible Copper Conductors, IEEE 383 (70,000BTU/hr) Flame Test, UL 1659 Vertical cable tray flame Test, ICEA S-95-658, NEMA WC-70, AAT, and MSHA.

RC
 
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