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Old 03-02-2017, 12:23 PM   #1
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Default SER (DIYer)

Since I am asking a question for personal residence am I considered a DIY'er? Will I be banned


I am installing a 150 amp subpanel and want to use SER can I use 1/0 Cu SER rated 150 amps at 75 or do I have to use the 65 rating?

I thought there was some rating issue for SEC and SER?
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Old 03-02-2017, 12:54 PM   #2
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Quote:
Originally Posted by brian john View Post
Since I am asking a question for personal residence am I considered a DIY'er? Will I be banned


I am installing a 150 amp subpanel and want to use SER can I use 1/0 Cu SER rated 150 amps at 75 or do I have to use the 65 rating?

I thought there was some rating issue for SEC and SER?
Yes, the ampacity of SER is taken from the 60 degree column.
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Old 03-02-2017, 01:31 PM   #3
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Yes, you are a DIYer, I can tell by the way you want to use copper for a service.

Which code cycle are you on? That's important since things have changed over the years going in one direction and then back in the other.
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Old 03-02-2017, 03:31 PM   #4
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I believe you guys are on the 2014. Basically if it runs thru insulation then it has to be 60C, otherwise 75C. The nice thing about this section you can use the rules of 310.15(A)(2)
Quote:
(2) Selection of Ampacity. Where more than one ampacity
applies for a given circuit length, the lowest value shall be
used.
Exception: Where two different ampacities apply to adjacent
portions of a circuit, the higher ampacity shall be
permitted to be used beyond the point of transition, a distance
equal to 3.0 m (10 ft) or 10 percent of the circuit
length figured at the higher ampacity, whichever is less.
Quote:
Originally Posted by 338.10
(4) Installation Methods for Branch Circuits and Feeders.
(a) Interior Installations. In addition to the provisions of
this article, Type SE service-entrance cable used for interior
wiring shall comply with the installation requirements of Part
II of Article 334, excluding 334.80.
Where installed in thermal insulation the ampacity shall be
in accordance with the 60C (140F) conductor temperature
rating. The maximum conductor temperature rating shall be
permitted to be used for ampacity adjustment and correction
purposes, if the final derated ampacity does not exceed that for
a 60C (140F) rated conductor.
Here is the 2017
Quote:
(4) Installation Methods for Branch Circuits and Feeders.
(a) Interior Installations. In addition to the provisions of
this article, Type SE service-entrance cable used for interior
wiring shall comply with the installation requirements of Part II
of Article 334, excluding 334.80.
For Type SE cable with ungrounded conductor sizes 10 AWG
and smaller, where installed in thermal insulation, the ampacity
shall be in accordance with 60C (140F) conductor temperature
rating. The maximum conductor temperature rating shall
be permitted to be used for ampacity adjustment and correction
purposes, if the final derated ampacity does not exceed
that for a 60C (140F) rated conductor.
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Old 03-02-2017, 03:49 PM   #5
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Is copper SER even still a thing? I'd run aluminum and not give it a moments thought.
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Old 03-02-2017, 10:47 PM   #6
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Quote:
Originally Posted by Dennis Alwon View Post
I believe you guys are on the 2014. Basically if it runs thru insulation then it has to be 60C, otherwise 75C. The nice thing about this section you can use the rules of 310.15(A)(2)




Here is the 2017
So under 2014 I can use the 75 degree column if not run through insulation?
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Old 03-02-2017, 10:55 PM   #7
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Quote:
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So under 2014 I can use the 75 degree column if not run through insulation?
Yep
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