jclint07
Member
- Location
- south missouri
It has been a while since my last topic but I have an EGC issue I would like comments on, involving a subpanel being fed by parallel feeders.
A new 400A 120/240V, single phase service disconnect is installed outside on the building.
From there, 2 paralleled raceways (Stabiloy cable with (3) 250AL & (1) #2AL each) feed a 400A rated indoor sub panel, roughly 15 feet inside the building from the service disconnect.
My question is does the #2AL in EACH cable meet the requirement for the EGC size, being it is on a 400A main disconnect? I say no.
250.122(F) states that when multiple parallel cables are used, the EGC shall be run in PARALLEL also, in each raceway and sized per 250.122.
I am being told that they are in compliance because there IS an EGC in each raceway per 250.122(F) and that the circular mil area of both #2AL EGC meet the circular mil area of (1) #1AL which makes them in compliance, per Section 310.4(E). I have never come across such an install. In the past, each EGC in each parallel raceway/cable was always sized per table 250.122 regardless of the actual combined circular mil area of both EGC.
A new 400A 120/240V, single phase service disconnect is installed outside on the building.
From there, 2 paralleled raceways (Stabiloy cable with (3) 250AL & (1) #2AL each) feed a 400A rated indoor sub panel, roughly 15 feet inside the building from the service disconnect.
My question is does the #2AL in EACH cable meet the requirement for the EGC size, being it is on a 400A main disconnect? I say no.
250.122(F) states that when multiple parallel cables are used, the EGC shall be run in PARALLEL also, in each raceway and sized per 250.122.
I am being told that they are in compliance because there IS an EGC in each raceway per 250.122(F) and that the circular mil area of both #2AL EGC meet the circular mil area of (1) #1AL which makes them in compliance, per Section 310.4(E). I have never come across such an install. In the past, each EGC in each parallel raceway/cable was always sized per table 250.122 regardless of the actual combined circular mil area of both EGC.