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Old 08-11-2014, 03:11 PM   #1
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Default Why isnt the dwelling table a violation?

Always wondered this. Table 310.15(B)(7) is basically based around the 90*C column of 310.15 B 16, so how does this table allow you to connect to a 75*C main? Or it doesn't?
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Old 08-11-2014, 03:50 PM   #2
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Originally Posted by meadow View Post
Always wondered this. Table 310.15(B)(7) is basically based around the 90*C column of 310.15 B 16, so how does this table allow you to connect to a 75*C main? Or it doesn't?
What year NEC?
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Old 08-11-2014, 04:20 PM   #3
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The table is not based on the 90C column but rather on the diversity of the loads of a residence. The panel sees that most loads in a house will never be on at the same time so there is never a fear of overloading it.

The 2014 code has gone to a 83% instead of the table as the table had issues with other factors that it did not consider. Basically if you want a 200 amp service then the conductor must be capable of handling 200*.83 or 166 amps including any derating that must be made
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Old 08-11-2014, 04:27 PM   #4
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Hey Harry,

. .. maybe you should change your s/n to white dog ?

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Old 08-11-2014, 06:18 PM   #5
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What year NEC?
2008 and 2011





Quote:
Originally Posted by Dennis Alwon View Post
The table is not based on the 90C column but rather on the diversity of the loads of a residence. The panel sees that most loads in a house will never be on at the same time so there is never a fear of overloading it.

The 2014 code has gone to a 83% instead of the table as the table had issues with other factors that it did not consider. Basically if you want a 200 amp service then the conductor must be capable of handling 200*.83 or 166 amps including any derating that must be made

Thanks

Which is the new code section?
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Old 08-11-2014, 06:26 PM   #6
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Which is the new code section?
same section, just no table there - now has words.

Quote:
(7) 1201240-Volt, Single-Phase Dwelling Services and
Feeders. For one-family dwellings and the individual
dwe11ing units of two-family and multifamily dwellings,
service and feeder conductors supplied by a single-phase,
120/240-volt system shall be permitted be sized in accordance
with 31 0.15(B)(7)(l) through (4).
(l) For a service rated 100 through 400 A, the service
conductors supplying the entire load associated with a
one-family dwelling. or the service conductors supplying
the entire load associated with an individual dwelling
unit in a two-family or multifamily dwelling, shall
be permitted to have an ampacity not less than 83 percent
of the service rating.
(2) For a feeder rated 100 through 400 A, the feeder conductors
supplying the entire load associated with a onefamily
dwelling, or the feeder conductors supplying the
entire load associated with an individual dwelling, unit
in a two-family or multifamily dwelling, shall be permitted
to have an ampacity not less than 83 percent of
the feeder rating.
(3) In no case shall a feeder for an individual dwelling unit
be required to have an ampacity greater than that specified
in 310.15(8)(7)(1) or (2).
(4) Grounded conductors shall be permitted to be sized
smaller than the ungrounded conductors, provided that
the requirements of 220.61 and 230.42 for service conductors
or the requirements of 215.2 and 220.61 for
feeder conductors are met.
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