This came up with a local dock builder.
Is UF allowed on a pier.?
There is some ambiguity in the NEC about wiring on piers. 555.13(A) says
(A) Wiring Methods.
(1) General. Wiring methods of Chapter 3 shall be permitted
where identified for use in wet locations
That would seem to allow type UF cable
but 555.15 (B) says
(B) Type of Equipment Grounding Conductor. The equipment
grounding conductor shall be an insulated copper conductor
with a continuous outer finish that is either green or
green with one or more yellow stripes.
UF has a bare grounding conductor.
The issue was direct buried UF coming from the house, then being sleeved in RNC out of the ground, up to the lift control box and other lighting and receptacle outlets.
I am leaning towards no. Transition to THWN before it gets to the pier with a compromise that this happen at the first J box on the pier.
I am not the AHJ here and so far none have brought it up but I am not sure how common the issue is. Most guys just run RNC and THWN the whole way
