Sizing a Cable

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Check with the AHJ

Check with the AHJ

Not sure how it is done in Texas, but in California, the AHJ for all Manufactured Modulars/Trailers is HCD (Department of Housing and Community Development). HCD states that the Nameplate rating is what must used for Modulars/Trailers. So even if the Load is only 60 Amps, the Service (and SE conductors) must be capeable of handling the Nameplate rating (usually 125 Amps per section).

I could be wrong (if so it wouldn't be the first time today). Hope that this helps.
 
xCod3m4nx said:
So I've been redoing my calculations and I've come up with some new info.

Running 2 3/C wires in parallel, I come up with
CM = (2 x 12.9 x 140/2 x 780) / 7.2 = 195650
So this gives me two 4/0 3/C wires running the 780ft from main breaker to service disconnect <30ft from double wide trailer. The two 4/0 cables also sets me at a 2.8% VD so I'm good there. Now I have to figure out what cables I'm running from the disconnect to the trailer.
Click to expand...

So what size EGC are you going to install?
 
bob - it would still be a #2 for each I believe, sorry forget to put that in there.

mcofsac - not sure but I'll look into that
 
Need some help with grounding. I have a breaker panel that is supplied by a 400A service (poco). In that breaker panel I have some CB but particularly I have a 200A 2-pole CB that I'm looking to run two 4/0 Cables 780ft to a disconnect breaker panel. But for each of the breaker panels, I'm running the two 4/0 cables into a junction box to bring the wire down to a 2/0 cable. Then from the disconnect breaker panel (which is a 200A main with two 100A 2-pole CBs) I'm running a #3 cable to trailer panel #1 and a #3 cable to trailer panel #2. My question is for sizing the EGC for these wires. For the 4/0 cable running 780ft I'm used a formula earlier in this post to come up with a #3 EGC but wanted to know if I was sizing the other cables correctly. For the 2/0 cables, I came up with #6 EGC and for the #3 cables, I came up with #8 EGC's. Is this correct or am I off?

All - thanks again for everyone's help so far
 
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