ELECTRIC ACE
Member
- Location
- Kemah, Texas
- Occupation
- Electric Contractor
What is the Smallest Natural (grounded conductor) for a service sized parallel 4 X 500 MCM Alu. ungrounded conductors?
Smallest Neutral (grounded conductor)
- Thread starter ELECTRIC ACE
- Start date
- Location
- New Jersey
- Occupation
- Journeyman Electrician (retired)
Smallest meaning that there is no neutral load?
Electric Ace, please update you profile to include your location and occupation.
Electric Ace, please update you profile to include your location and occupation.
That would be for the GEC. For the OP's question 220.61 comes into play.
- Location
- Illinois
- Occupation
- retired electrician
and if there is no or little neutral load, you apply 250.24(D)(2)
Which sends you to table 250.102(C)(1) which is very similar to 250.66.
- Location
- Illinois
- Occupation
- retired electrician
Yes, 250.102(C)(1) was added to get rid of confusion that was caused by using 250.66 for multiple purposes. Most notably the largest conductor required by 250.66 is 3/0 and 250.102(C)(1) requires conductors larger than 3/0.
ELECTRIC ACE
Member
- Location
- Kemah, Texas
- Occupation
- Electric Contractor
I'm Going with Table 250.66, 250 MCM Alu. one in each raceway.
I think it relates to service entrance conductors.
Table 250.102(C)(1) I think relates to bonding jumpers and Parallel feeders over 1750 to be sized at 12-1/2%.
I think it relates to service entrance conductors.
Table 250.102(C)(1) I think relates to bonding jumpers and Parallel feeders over 1750 to be sized at 12-1/2%.
- Location
- Illinois
- Occupation
- retired electrician
Starting with the 2014 code, 250.24(C) has specifically referenced Table 250.102(C)(1) for the minimum size of the service grounded conductor.