Parallel Cables grounding

[tom baker]

I can't put my finger on it in the Code but I thought it addressed multiconductor cables with multiple EGCs allowing the area of multiple smaller conductors to be combined. His cables have 3-#2 EGC which would have a combined area greater than the required 3/0.
Am I mistaken ??

I just read 250.122 and I didn’t see that is allowed, so in a word, yes

 

[tom baker]

I reviewed 250.122. One part for cables in a raceway states the cable individual EGC are connected together, and the correct size equipment grounding conductor is also installed, and connected to the individual connectors.

 

[kenaslan]

Why parallel 500 kcmil for a 400 amp OCPD?

Dont know. What is the distance? What is the load? Is there a VFD? If so, what is the nameplate on the VFD? Maybe the designer/engineer forgot to change from 2-3/C #500 to just a 3/C #500 and it was an oversight.

 

[mooreaaryan]

Engineers decided to copy and paste. Run is only 85 ft term to term

 

[mooreaaryan]

Dont know. What is the distance? What is the load? Is there a VFD? If so, what is the nameplate on the VFD? Maybe the designer/engineer forgot to change from 2-3/C #500 to just a 3/C #500 and it was an oversight.

This is very likely…100 up drive. Our previous “copy and paste” project was 150hp

 

[mooreaaryan]

A 3 grounded cable is usually for a VFD. Probably 3 #6 as that is the most common. Terminate the three grounds in an Ilsco multi lug. 3 #6 in 1 #2 out. as mentioned, twisting together is a code violation.

10-4. Thank you I appreciate the input sir. We will be correcting Monday

 

[mooreaaryan]

Everyone. Thank you for helping out… turns out that myself, my bosses and our pm have been do it wrong for 10,24,26 years respectfully. Just goes to show just because you do it one way doesn’t mean your right Always be willing to take lessons regardless of the cost! Have a good one stay safe

 

[wwhitney]

I just read 250.122 and I didn’t see that is allowed, so in a word, yes

250.122(A) second paragraph says "Equipment grounding conductors shall be permitted to be sectioned within a multiconductor cable, provided the
combined circular mil area complies with Table 250.122."

Plus, there's 310.10(G)(5) on sectioned EGCs. Also, there's the general argument that since 310.10(G)(1) only restricts parallel installations for non-EGCs, that means EGCs can be paralleled in any size. Likewise, while 310.10(G)(5) explicitly permits sectioned EGCs in cables, it doesn't prohibit them in other cases.

Cheers, Wayne

 

[tom baker]

Wow. I have been completely ignorant to this Thank you so much for clarifying this. I appreciate it .

You are not the first person to have the wrong size EGC.

Everyone. Thank you for helping out… turns out that myself, my bosses and our pm have been do it wrong for 10,24,26 years respectfully. Just goes to show just because you do it one way doesn’t mean your right Always be willing to take lessons regardless of the cost! Have a good one stay safe

You are welcome. Thanks for your asking and using the forum.

 

[LarryFine]

250.122(A) second paragraph says "Equipment grounding conductors shall be permitted to be sectioned within a multiconductor cable, provided the
combined circular mil area complies with Table 250.122."

Plus, there's 310.10(G)(5) on sectioned EGCs. Also, there's the general argument that since 310.10(G)(1) only restricts parallel installations for non-EGCs, that means EGCs can be paralleled in any size. Likewise, while 310.10(G)(5) explicitly permits sectioned EGCs in cables, it doesn't prohibit them in other cases.

So, I was correct 'way back in post #15?