newinspector1
Member
- Location
- NC
On modular homes if mobile home feeder is used instead of ser cable does the rules of 310.15 (B)(6) still apply? Can you run other circuits to the main panel and not downsize the breaker?
310.15(b)(6)
- Thread starter newinspector1
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jxofaltrds
Inspector Mike®
- Location
- Mike P. Columbus Ohio
- Occupation
- ESI, PI, RBO
It applys but why would it affect anything?
Dan coulstring
Member
- Location
- Maine
I couls be wrong but I think "mobile home feeder" is USE-2 OR RHH OR RHW-2 all of which fall under
Table 310.15(B)(7) Conductor Types and Sizes for
120/240-Volt, 3-Wire, Single-Phase Dwelling Services and
Feeders. Conductor Types RHH, RHW, RHW-2, THHN,
THHW, THW, THW-2, THWN, THWN-2, XHHW,
XHHW-2, SE, USE, USE-2
Conductor (AWG or kcmil)
Not sure about the second part of your question
Table 310.15(B)(7) Conductor Types and Sizes for
120/240-Volt, 3-Wire, Single-Phase Dwelling Services and
Feeders. Conductor Types RHH, RHW, RHW-2, THHN,
THHW, THW, THW-2, THWN, THWN-2, XHHW,
XHHW-2, SE, USE, USE-2
Conductor (AWG or kcmil)
Not sure about the second part of your question
Buck Parrish
Senior Member
- Location
- NC & IN
What do you have, is it a 200 amp feed through panel. With the ac condensing unit fed from the out side panel ?
jxofaltrds
Inspector Mike®
- Location
- Mike P. Columbus Ohio
- Occupation
- ESI, PI, RBO
I did not read all of your post. My mistake.
I understand your concern. Is it similar to what Buck said?
I would approve it using 550.33(B).
Jim W in Tampa
Senior Member
- Location
- Tampa Florida
It is not service, it is a sub panel fed from the panel on pole
jxofaltrds
Inspector Mike®
- Location
- Mike P. Columbus Ohio
- Occupation
- ESI, PI, RBO
Not following you Jim.
Jim W in Tampa
Senior Member
- Location
- Tampa Florida
If he is talking about line from outside panel to inside panel it is not service
The main panel is the 1 on the pole
Maybe I am not seeing his real question
jxofaltrds
Inspector Mike®
- Location
- Mike P. Columbus Ohio
- Occupation
- ESI, PI, RBO
He may be worried that the feeder is not supplying the entire load.
Jim W in Tampa
Senior Member
- Location
- Tampa Florida
If the other loads are off the panel on pole there is no problem. If coming off inside panel still no issue because the feeder is protected at the panel on pole
newinspector1
Member
- Location
- NC
Mike that is my question because I don't think that it is supplying the entire load. There is no pole this is a modular home with a service on the house. The electrician ran mobile home feeder and said that got him out of having to downsize his breaker.
Jim W in Tampa
Senior Member
- Location
- Tampa Florida
Then this is SERVICE, i missed that in the OP.
If you now add loads you might need to redo the load calculation. Are we talking about a serious add on like work shop or just the AC and a pump
If you now add loads you might need to redo the load calculation. Are we talking about a serious add on like work shop or just the AC and a pump
newinspector1
Member
- Location
- NC
Jim, it is just the a/c but I had the understanding that it could have no additional loads. Most people around here are just going straight to the inside panel now.
Jim W in Tampa
Senior Member
- Location
- Tampa Florida
Basically your right as this was designed for the loads it has. Very unlikely that they did not allow for an AC but simply could not know the location at the factory. If it is a 200 amp main breaker and feed is sized correctly i would just let it pass.
- Location
- Chapel Hill, NC
- Occupation
- Retired Electrical Contractor
We really need to know what a mobile home feeder is. IMO, if there is pipe from the outside panel to the interior panel and the wire is rated for use in a home, not all USE cable is allowed inside, then I would say that 4/0 aluminum is okay as long as the calculated load is not more than 180 amps.
Jim W in Tampa
Senior Member
- Location
- Tampa Florida
He does not have an outside panel
- Location
- Chapel Hill, NC
- Occupation
- Retired Electrical Contractor
He is talking about mobile home wire and ser. Whether the panel is inside or outside doesn't matter. It appears there are 2 panels in the scenario.
Mobile home feeder is typically a 3-wire with ground AL Type USE-2/RHH/RHW-2 cable, often with a smaller conductor for the neutral.
http://www.cerrowire.com/default.aspx?id=38
- Location
- Chapel Hill, NC
- Occupation
- Retired Electrical Contractor
Thanks and that is what I assumed. I was hoping it wasn't a URD cable. Not sure why they chose USE wire if the run is in conduit.
jxofaltrds
Inspector Mike®
- Location
- Mike P. Columbus Ohio
- Occupation
- ESI, PI, RBO
With limited knowledge and not being there he may be correct.
Assume an outside disconnect.
Feeder, from the disconnect, goes to the homes 'main' panel.
AC 'feed' out of the disconnect.
I would pass this installation. Why?
The "entire load", condition, is not stated as a requirement in 550.
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