I was called to upgrade fuse boxes in an older mobile home to a 100A breaker panel. When I inspected the job, I noticed that the trailer used a permanent feeder from the service equipment (mounted on a nearby utility pole)that consisted of #2 SE cable. I wasn't sure if I could connect the new panel to this cable, or if I have to replace it with a four-wire feeder. After checking Article 550, it seemed to me that there was a lot of contradiction in Parts II and III as to which way to proceed (i.e. 550.10(I)(1), and 550.33 (A) exception.
If I can re-use the existing SE cable, do I need to drive a ground rod at the trailer panel (in addition to the one at the service equipment location of course), or am I not supposed to?
Also, the existing fuse panels are located in a rear bedroom closet, in violation of 550.11(A). Can I still place the new panel there, as it is a replacement and not new work?
Lastly, since I'm trying to do everything else right, I intend on using AFCIs for the bedrooms, but I was wondering if in this situation that would be considered a requirement.
Thanks for any feedback!