US, Southern CA, NEC 2017
I have a 15A* kitchen branch circuit not feeding countertop outlets that also feeds a single outlet on an exterior wall. The existing circuit consists of three indoor outlets, a ceiling fan, and one outdoor outlet, and one outdoor light fixture, connected by Romex. A switch is installed inside the house but is currently disconnected.
[* A 20A breaker is installed for this circuit but the wiring may only be rated for 15A. I have verified that it only feeds the ceiling fan and some outlets on a wall opposite the countertops]
I'm hoping to answer whether this branch circuit can also be used to power an outdoor shed office, plus some additional exterior outlets. Summing up the expected loads, the total power usage for the entire circuit is around 1000W. I have seen that you can only run a single circuit to an outbuilding, and that all wires for a circuit must be contained in the same wiring method.
The proposed additions:
- conduit and junction boxes leading to the shed (J1 & J2)
- a disconnect mounted on the exterior wall of the shed (S2)
- a GFCI outlet and switch at the base of a nearby pillar (O5 & S3). The switch controls a remote outlet for a pond pump (O7) to be run intermittently
- an overhead GFCI outlet for lights (O6) controlled by a switch inside the house (S1)
Aside from burying the conduit at the correct depth, using GFCI for exterior outlets, and having a disconnect means for the shed, are there other code requirements that would apply to extending this branch circuit?
Is there anything restricting running the 4 wires in a single conduit (hot, neutral, ground, switched hot S1 > O6) or does the shed need its own conduit (hot, neutral, ground), separate from the conduit feeding the exterior outlets (hot, neutral, ground, switched hot)?
Are there any things to watch out for with this plan?