New branch circuit in mfg home

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tom baker

tom baker

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Master Electrician
Need to run a branch circuit in a mfg home, 30 Amp, 120 volt to a water heater. Circuit would run from panel, down to under chassis space , and over to bathroom.
I have never installed wiring in a mfg home, read thru Art 550, and would
1. Wiring under mfg home has to be protected and suitable for wet location, PVC with THHN/W
2. Branch circuit would have to be GFCI/AFCI protected

Branch circuit would cross where sections are joined. How is allowance made for future disconnection of sections?

Someone in the past ran romex for an outside condensing unit from the 200 amp service, thru the under chassis space (laying on ground) and out to condensing unit. Not sure what the inspector will say about that.
 
Unless the water heater was in an area that required GFCI, and cord/plug, I don't see it needing GFCI protection. Also, I think AFCI requirement is different for MH. Not sure though as I didn't look in 550.
 
They don’t have to be in conduit under house I think your reading 550.15 H and that states ( exposed to weather). If that is we’re you got it read the H 1
We run nmb under these all day.

Supporting under them is annoying- d ring or , zip ties with mounting holes work good
 
AC\DC said:
They don’t have to be in conduit under house I think your reading 550.15 H and that states ( exposed to weather). If that is we’re you got it read the H 1
We run nmb under these all day.

Supporting under them is annoying- d ring or , zip ties with mounting holes work good
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If on perminant foundation I would agree, but here 99% of mobile homes only are provided with vinyl skirt that really provides very little protection (most provided with ventilation openings). NEC definition for "exposed" includes behind panels intended to allow access. Also alot of people around here will use the space under the mobile home to store outdoor items, removing the panels to slide things underneath. I also remember as a kid we lived in one and use to go under the trailer all the time as a hiding location playing hide-n-seek.

All factory NM is under (behind) the vapor barrier and not "exposed" under the chassis.
 
I'm not aware of what Code cycle or WA Code applies but are 30 amp 125v circuits required to be AFCI or GFCI ??
I agree with Fred in that most areas here require NM to be above the under chassis vapor barrier.
 
I agree with skirting. We are the opposite around here, all on foundation. So never think about it.
If you put tamper screws on skirting so it’s no normally removable would that be work
 
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