Can anyone shed some light on installing parallel conductors specifically regarding the the grounded circuit conductor. Cable manufacturers make multiconductor cables with standard size configurations (for example 3-500 kcmil conductors with a #2 ground conductor). When you have (6) sets of 500 kcmil conductors (6 per phase) for ungrounded conductors, can you use multiconductor cables that only have a #2 AWG ground conductor? This has always been confusing. 2005 NEC mentioned (under 250.122 (F) (2) that you can if you have ground fault set to protect a #2 AWG conductor. 2008 NEC removed 250.122 (F) (2). Is this no longer allowed? Also, is it permitted to use the (6) paralleled #2 AWG conductors in this case as the grounded circuit conductor since these are not a minimum size of # 1/0 AWG (normally required for parallel conductors). I know that # 1/0 is not required for parallel euipment grounding conductors, but for the case when these are a feeder from a wye secondary transformer - can these (6) # 2 AWG conductors be utilized for the neutral/ground fault return path conductors?
Article 250.122F
- Thread starter jbudlight
- Start date
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Best guess after looking at the article in 08 NEC is that they chopped the 250.122(F) down to what it is now is that manufacturers have had plenty of time to configure the manufacturing process to be able to deliver a product that was the original intent of the 05 NEC was, before it got long and complex.
Now it's simple, cable has to follow the same rules as everyone else.
Now it's simple, cable has to follow the same rules as everyone else.
- Location
- New Jersey
- Occupation
- Journeyman Electrician
Here's the explanation according to the 2008 NECH:
- Status