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Old 04-27-2010, 08:16 PM   #16
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The 08 reduced the ampacity of SER to the 60 degree ampacity.
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Old 04-27-2010, 09:42 PM   #17
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Quote:
Originally Posted by Jim Port View Post
The 08 reduced the ampacity of SER to the 60 degree ampacity.
Well then that's why I was confused, thanks!

Out of curiosity, where is that change made? I am looking at 310.16 in both 05 and 08 and I'm not seeing any SER type listed.
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Old 04-27-2010, 10:08 PM   #18
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SER is covered by Article 338.
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Old 06-30-2010, 02:34 PM   #19
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Quote:
Originally Posted by Magnettica View Post
NEC 240.4 (B)

Devices Rated 800 Amperes or Less. The next higher
standard overcurrent device rating (above the ampacity of
the conductors being protected) shall be permitted to be
used, provided all of the following conditions are met:
(1) The conductors being protected are not part of a multioutlet
branch circuit supplying receptacles for cordand-
plug-connected portable loads.
(2) The ampacity of the conductors does not correspond
with the standard ampere rating of a fuse or a circuit
breaker without overload trip adjustments above its rating
(but that shall be permitted to have other trip or
rating adjustments).
(3) The next higher standard rating selected does not exceed
800 amperes.

I'm going to revive this thread and see if I can make sense out of it.
When I rebuild my cabin in a few weeks I will be running a new service. It will have two meters - electric heat and the regular service - and two 100 amp main disconnect panels. The feeds will be direct bury 2-2-4 XHHW-2 aluminum at least that is what I'm planning. When I did a 100 amp service lateral to my garage three years ago that is what the inspector said to use.
I'm trying to get a better understanding of ampacity and how the tables work.
My panels are 100 amp GEs and the main breakers say 75 deg.
The chart I'm using (Code Check 2005 - NEC T310.16) says #2 AL XHHW-2 is 100 amps in the 90 deg column.
An ad in the local Shopper has 2-2-4 AL listed and says it is for 100 amp service.
Since my mains are 75 deg. breakers, how does this all work out? It that what is covered in NEC 240.4 shown at the beginning of this posting?
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