Were the Dwelling Services Feeders Found Under Sized!

[iwire]

In commercial work AHJs will often let you use a smaller wire size.

I doubt it.

As do I.


But mink may be seeing the application of 240.4(B), say 500 copper for 400 amps etc.

 

[norcal]

In commercial work AHJs will often let you use a smaller wire size. Ask the AHJ - they are the boss-not the NEC. Also what does you remodeled load calc show?

So they get to make the rules out of thin air? Just think of the money the jurisdiction saves by not buying codes. :happysad:

 

[kwired]

So they get to make the rules out of thin air? Just think of the money the jurisdiction saves by not buying codes. :happysad:

actually think about all the revenue they take in with correction notices and reinspection fees.:blink:

 

[electrofelon]

As do I.


But mink may be seeing the application of 240.4(B), say 500 copper for 400 amps etc.

Good point, maybe that is what he is saying or seeing.

 

[ptonsparky]

NEC states,
For individual dwelling units of one-family, two-family, and multifamily dwellings, conductors, as listed in Table 310.15(B)(7), shall be permitted as 120/240-volt, single-phase service-entrance conductors and service lateral conductors.

I conducted a site survey of a large multifamily apartment complex that was built in 1997, and found what I feel is a violation to the code.
I surveyed over 300 Apt. units, and found that every unit was being feed with a 100 amp OCPD with a #2 aluminum SEC conductor to a 100amp bus MLO sub-Panel in each unit.

Each block of apartments have a main electrical room with a multi meter section with one meter and one main circuit breaker enclosure for each apartment (housing the 100amp unit main).

Violation;
Feeds from the 100amp main breaker enclosure to the apartments Sub-panels (30-150ft away) should be per table 310.16 and not Table 310.15(B)(7). Correct?

Question;
Isn't the apartment panel a "Sub-panel" and is not considered the "Main Panel" therefore section and table 310.15 can not be used? and in fact the feeders should be a size #1 Alum.?
So, if the above statement is correct, should I suggest in my feasibility report, that the conductors or the main breaker be changes out to the correct size(s)?

Thanks for all your feed back.

Of those 300 apt units, how many had suffered damage because of this violation? Maybe this isn't such a concern as they finally realize in the 2017.