Parallel Feeder via Conduit and Cable Tray

[myntz]

First time posting here, so I apologize if there are standards that I am not following. I have a 1600A feeder that needs to be pulled via conduit and then transition into cable tray. I have 5 sets of 350MCM and I have adjusted trip unit to dial it down to meet the ampacity. I understand that for parallel feeder via conduit, each conduit will need an equipment ground conductor. I also understand that for cable tray, a single equipment ground conductor is sufficient. Am I allowed to run 5 EGC via conduit and then "splice" it into the single EGC in the cable tray? Would this violate 310.10(g)(2)? How do you handle EGC when you have parallel feeders transition from conduit to cable tray?

 

[don_resqcapt19]

I don't see a code issue. You will need some type of spice plate to connect all six equipment grounding conductors together. Also don't forget that you need a full sized EGC in each raceway.

 

[myntz]

I don't see a code issue. You will need some type of spice plate to connect all six equipment grounding conductors together. Also don't forget that you need a full sized EGC in each raceway.

100% will need full size EGC (4/0) in each conduit. I am mostly concerned with language in NEC 310.10(g)(2) where it says parallel conductors need to be same length, same size in circular mil and terminated in the same manner. By splicing all EGC together at the point of entrance on the cable tray, I am not sure if it violates 310.10(g)(2), especially the language around same size circular mil.

 

[wwhitney]

100% will need full size EGC (4/0) in each conduit. I am mostly concerned with language in NEC 310.10(g)(2) where it says parallel conductors need to be same length, same size in circular mil and terminated in the same manner. By splicing all EGC together at the point of entrance on the cable tray, I am not sure if it violates 310.10(g)(2), especially the language around same size circular mil.

310.10(g)(2) just applies to each conductor type and segment separately. It does not compare the EGC characteristics to say the ungrounded conductor characteristics. So it tells you that the 5 EGCs in the conduit will all have to be the same length and size, etc, as each other, and that you should connect them all together when you transition from 5 parallel EGCs to a single EGC in the cable tray. That's all.

Cheers, Wayne

 

[don_resqcapt19]

310.10(G) does not apply to equipment grounding conductors.

(G) Conductors in Parallel.
(1) General.
Aluminum, copper-clad aluminum, or copper circuit conductors for each ungrounded conductor, grounded conductor, or neutral conductor shall be permitted to be connected in parallel (electrically joined at both ends) only in sizes 1/0 AWG and larger and shall be installed in accordance with 310.10(G)(2) through (G)⁠(4).

 

[wwhitney]

310.10(G) does not apply to equipment grounding conductors.

310.10(G)(1) doesn't, meaning you can parallel EGCs smaller than 1/0 AWG. But 310.10(G)(2) lists EGCs among the conductors its requirements apply to. Maybe they are trying to say it only applies to any EGCs run with other paralleled conductors?

(G) Conductors in Parallel.
. . .
(2) Conductor and Installation Characteristics. The paralleled conductors in each phase, polarity, neutral, grounded circuit conductor, equipment grounding conductor, or equipment bonding jumper shall comply with all of the following:
. . .

Cheers, Wayne

 

[myntz]

310.10(g)(2) just applies to each conductor type and segment separately. It does not compare the EGC characteristics to say the ungrounded conductor characteristics. So it tells you that the 5 EGCs in the conduit will all have to be the same length and size, etc, as each other, and that you should connect them all together when you transition from 5 parallel EGCs to a single EGC in the cable tray. That's all.

Cheers, Wayne

This explanation makes sense to me, definitely feel much better with a second opinion.