Nec 210.18

[JD_2207]

According to
Nec 210.18

Can I run an SER cable 4/0
From basement
From an 100amp breaker
[Meter socket breaker]

To 3rd floor
Land on an panelboard
150amp /main lug

 

[infinity]

Yes but realize that for 100 amps #4/0 (180 amps) is very oversized.

 

[augie47]

The only reason I could think of that would prohibit such an install would be a construction type that does not allow NM/SER {338.10(B)(4) >> 334.10 }

 

[Dennis Alwon]

There is no need for 4/0 if you are using a 100 amp breaker. Remember the size of the service will determine how much load you can add.

 

[JD_2207]

another question
NEC language is most of the time confuse.

according to NEC 210.23, A, 1 , 2
and tables 210.21B 3 and 210.24

IF circuit rating 20a....you can use 15 or 20 Receptacles Rating [amp]

so what about the kitchen counter receptacles
that means ...we can use 15amp receptacles on that
20amp branch circuit
and the others like:

Micro W
Fridge
exhaust fan HOOD
etc.

thanks in advance

 

[infinity]

If circuit rating 20a....you can use 15 or 20 Receptacles Rating, so what about the kitchen counter receptacles
that means ...we can use 15amp receptacles on that 20amp branch circuit

Yes, if you use a 15 amp duplex receptacle it is permitted on a 20 amp circuit.

 

[Eddie702]

another question
NEC language is most of the time confuse.

according to NEC 210.23, A, 1 , 2
and tables 210.21B 3 and 210.24

IF circuit rating 20a....you can use 15 or 20 Receptacles Rating [amp]

so what about the kitchen counter receptacles
that means ...we can use 15amp receptacles on that
20amp branch circuit
and the others like:

Micro W
Fridge
exhaust fan HOOD
etc.

thanks in advance

On any 20 amp circuit with multiple receptacles (even 1 duplex receptacle) you can use 15 amp receptacles as long as they are large enough for the load served.

If you run a dedicated 20 amp circuit like for a large window AC that needs a 20 amp circuit then you need to use a 20 amp receptacle and it should be a single receptacle not a duplex

 

[wwhitney]

Just wanted to comment on the thread title--in reference to the OP, the conductors in question are a feeder, not a branch circuit, and so Article 210 does not apply to them.

Cheers, Wayne

 

[JD_2207]

again CODE language leave you in the limbo

210,20 B , 2....
where connected to a branch circuit supplying two or more
receptacles or outlet
a receptacle SHOULD NOT SUPPLY a total cord and plug
connected load in excess of the maximum
specified in

table 210,21 B,2
circuit rating....receptacle rating ...maximum load [80%]
15 or 20 15 12
20 20 16


***you need to know the load
to make a professional decision


and NEC 210,20 B , 3
where connected to a branch circuit supplying two or more
receptacles or outlets ,receptacles ratings
shall conform to the values in
Table 210,21,B,3
circuit rating.........receptacle rating ...
15 15
20 15 or 20


and here ..[humble opinion]
if you choose to use
a single 15amp receptacle
on a dedicate branch circuit [20amp]
I feel I'm guessing

you never know what load[amp] would be connected
by the customer


JD-2207

I appreciate so much
your replies

 

[infinity]

if you choose to usea single 15amp receptacle
on a dedicate branch circuit [20amp]
I feel I'm guessing
You never know what load[amp] would be connected
by the customer

Is that permitted?

 

[Fred B]

There is no need for 4/0 if you are using a 100 amp breaker. Remember the size of the service will determine how much load you can add.

But remember if the feeder is not providing 100% of the dwelling units load you don't get to take advantage of the 80% sizing of the conductor, so can't use a #2 AL. Agree a 4/0 AL is most likely oversized and most likely will not even fit a 100A breaker lugs.

This is a frequent violation around here. Supply house sells the guy the #2 AL SER for 100A on a subpanel, but that is only rated to 90A per 310.15.

 

[suemarkp]

again CODE language leave you in the limbo

210,20 B , 2....
where connected to a branch circuit supplying two or more
receptacles or outlet
a receptacle SHOULD NOT SUPPLY a total cord and plug
connected load in excess of the maximum
specified in

table 210,21 B,2
circuit rating....receptacle rating ...maximum load [80%]
15 or 20 15 12
20 20 16


***you need to know the load
to make a professional decision

To me this isn't confusing, but somewhat impractical language. This is more of a limit on manufacturers than on a person. If you have a single appliance with a 15A plug and it draws more than 12A, the manufacturer will put a note in the instructions that says "this must be connected to a dedicated circuit" because a dedicated circuit with a single 15A receptacle can be used at 15 amps. Dedicated circuits are rare in dwellings, and homeowners don't typically read or follow directions. It would be more "code legal" if all the receptacle circuits were 20A and you installed 20A duplex receptacles (the T slot variety so they will take a 15A or 20A plug). Having a 20A receptacle will allow that 13A device with a 15A cord to be plugged in legally.

This is rarely an issue for the electrician unless you know of some cord and plug device that a customer wants to plug in and you are installing a circuit for it. Or, just always make common receptacle circuits 20A circuits with T slot duplex receptacles.

 

[BarryO]

To me this isn't confusing, but somewhat impractical language. This is more of a limit on manufacturers than on a person. If you have a single appliance with a 15A plug and it draws more than 12A, the manufacturer will put a note in the instructions that says "this must be connected to a dedicated circuit" because a dedicated circuit with a single 15A receptacle can be used at 15 amps..

Doesn't that translate into a UL thing? I don't think I've ever seen a 1800 watt appliance with a NEMA 1-15 or 5-15 plug.

The only appliances I've seen with NEMA 5-20 plugs are those intended for commercial kitchens. Thar does ensure they are installed on a 20A branch.