The reason for the change, is to for the NEC to keep moving in a direction away from allowing the grounded conductor to be used as an equipment grounding conductor on the load side of the service disconnecting means.
I agree that some things seem to be over the top. AFCI's among them, but pulling in a EGC with your feeders to another structure seems like a good idea to me. We don't allow feeders inside a structure to be pulled in without a EGC. Doesn't seem like a good idea just because you're going outside the structure. I doubt getting a cut to length aluminum conductor to use as your ground really doubles the cost of your cable installation.
That's it, all right. The entire chassis could become energized with a 3-wire supply.What makes a trailer special? This I don't know but that is the way it is and has been that way for as long as I can remember. No doubt it has something to do with the metal framing of the trailer, I think.
i am not on any code, there are no code requirements there. i don't even have to pull an electrical permit. i just want to be safe and i don't want to waste money for something that doesn't need to be.
this is a new code requirement, obviously things ran fine before they placed this into existance. any one that is an electrician wire detached buildings that way before.
if you could do things any way you wanted I AM SURE that there would be portions of the NEC that you would exclude.
How is it that it is safe enough for services but not safe enough for a feeder?
thanks for the many replies, all well most all are appreciated!!!!
the county electric company requires a disconnect, the is why the problem exists.
The same set up as a trailer 550.32 A. The disconnecting means is located away from the trailer thus making the panel in the trailer a sub panel. Code addresses this also as having no phone,cable lines running to the building. Most will have at least a phone line. A phone and/or cable line could be energised and inadvertently become currant carrying conductors.What seperates the two, a trailer with no metal running between the two disconnect and two buildings with no metal running between the two? One you have to run a EGC (trailer) and the other (house to out building, garage ect) you don't. What makes a trailer special? This I don't know but that is the way it is and has been that way for as long as I can remember. No doubt it has something to do with the metal framing of the trailer, I think.