ECN Forum Forums Code Related Discussion NEC & other Code issues 100 A feeders

Virgil;
it's simply a matter of wording. don't go looking for #3 just yet, those other threads
,burning a hole thru cyberspace, have some big guns who are explaining the situation down to the punctuation marks.
(As well as some ROP's)

I'm presently doing an 8 meter pack 120/240 1 ph 3 wire, instead of 3 ph to take advantage of #2, on an 8-unit dwelling.....
( wanna job ?)

Yeah, but have we actually come to any conclusions? All I hear are code loops, man...



[This message has been edited by sparky66wv (edited 05-18-2001).]

Sparky66
I think the only conclusion that would be valid is from your local AHJ or if someone requests a formal interpretation from the NFPA. Anything else is just opinion.
Don(resqcapt19)

The AHJ is my own conscience...

Unless a meter gets pulled (EI visit for the service only)

or I'm in L'burg (building inspector- don't get me started again!)

Article 215-2(d)permits using article 310-15(b)(6) for sizing the feeder conductors in an individual dwelling unit. Article 310-15(b)(6) directs you to table 310-15(b)(6). Table 310-15(b)(6) doesn't mention SER insulation type. What is SER? Service entrance rated?

I don't know what it means, but SE is flat with 2 hots and a bare neutral (wrapped around the hots). SER has two hots, an insulated neutral and a reduced ground, and is round in shape, and the conductors are twisted together. Does R stand for "round" (that's how I remember it)

[This message has been edited by sparky66wv (edited 05-18-2001).]

215-2(d) is all well and good, but what if you're subbing off of a 200A panel?

215-2(d) applies if you have a #2 service entrance conductors, but most situations I'm talking about are truly sub panels being fed from a 200A Panel, although I started this thread with a 100A service and disco in mind. How does this change things here?

Someone somewhere mentioned using a 90A breaker and saying to heck with it...

You size your service-entrance conductors per Table 310-15(b)(6). Why can't you size the 100 amp sub panel feeder conductors per Table 310-15(b)(6)? Me thinks some people are reading way too much into this example. Present company excluded! Like Don said, talk to the AHJ. IHMO the NEC Gods need to tie article 215-2(d) directly to Table 310-15(b)(6) and not article 310-15(b)(6). That would eliminate some, if not all, of the confusion. If it was me installing a sub panel, I would use Table 310-15(b)(6).

336-26 needs a ref to 310-15(b)(6) the same as 215-2(d) does ( as one ROP intends)

This thread has now been introduced to the big guns at the IAEI Bulletin Board . It looks like it's heating up there too! Let's see, that's four independent BB's on one unique topic at the same time! Wow! And coming to the same confusions I might add...