Oldmaster2
Member
- Location
- PA
- Occupation
- Master Electrician
A client of mine had a home inspection and the 100 amp service cable had to be replaced. Inspector informed me that 2/2/4 -al. is no longer legal. Anybody else run into this?
Size of SEU
- Thread starter Oldmaster2
- Start date
- Status
letgomywago
Senior Member
- Location
- Washington state and Oregon coast
- Occupation
- residential electrician
He doesn't know about the 83% rule for residential.
electrofelon
Senior Member
- Location
- Cherry Valley NY, Seattle, WA
Another inspector who needs a new line of work - sorry but its just not working out.
letgomywago
Senior Member
- Location
- Washington state and Oregon coast
- Occupation
- residential electrician
I have a feeling it's a home inspector which is imaginary authority
Oldmaster2
Member
- Location
- PA
- Occupation
- Master Electrician
It does. He is a city electrical inspector. This particular install has a 100 amp panel and a sub-panel. He commented that #1 SEU is not made so you need to install conduit?
electrofelon
Senior Member
- Location
- Cherry Valley NY, Seattle, WA
As long as the #2 is serving the entire load of a single dwelling unit, you can use for a 100A service. I have no idea what this inspector is talking about, unless maybe like letgomywago said, he's not familiar with the revision that added the 83% wording instead of the table.
Electromatic
Senior Member
- Location
- Virginia
- Occupation
- Master Electrician
Didn't the table come back in 2020? (We're still on the 2017 code.)
letgomywago
Senior Member
- Location
- Washington state and Oregon coast
- Occupation
- residential electrician
1 is made
Service Entrance Cable, Aluminum | WireAndCableYourWay.com
SER is a type SE (service entrance), Style R (reinforcement tape) cable, used as an above ground service entrance cable, a panel feeder and in branch circuits.
Does your local area not allow seu by local amendment
- Location
- New Jersey
- Occupation
- Journeyman Electrician
Even if they didn't make #1 Al SEU you could always use a larger size SE cable. Sounds like the inspector is incorrect on this one.
wwhitney
Senior Member
- Location
- Berkeley, CA
- Occupation
- Retired
So for a single dwelling unit, you have:
#2 Al service conductors -- 100A service OCPD -- 100A bus with other OCPD -- 100A feeder OCPD -- #2 Al feeder conductors
If so, that's fine, in this case the 83% rule applies to both the service conductors and the feeder conductors. It would make little sense to require the feeder conductors to be physically larger than the service conductors.
Cheers, Wayne
- Location
- Illinois
- Occupation
- retired electrician
Yes the table is back as Table 310.12 in the 2020 code. It can also be found in Example D7 in Annex D in the 2017 code.
- Location
- Illinois
- Occupation
- retired electrician
Correct, but many code users get hung up on the requirement that the feeder must carry 100% of the dwelling unit load and do not read 310.15(B)(7)(3) which permits the use of the smaller conductor for a feeder even where the feeder does not carry 100% of the dwelling unit load.
- Status