I'm trying to replace a non-working fused shutoff in a greenhouse behind my mother's house. It contained a burned up rat and looked like maybe it was not functioning for a long time, maybe bypassed? The conduit, junction boxes and outlets are not sealed. The existing setup looks something like this: 1. main shutoff 2. main breaker 3. wiring under house, probably around 40ft of white romex looking wire 4. junction box at corner of house 5. 40ft of conduit 6. broken fused disconnect 7. 6-8 outlets, some controlled by 2 light switches, romex some in and out of conduit, kind of a mess 8. There is an oil fired water heater that uses around 6 amps. 9. A small mini fridge, let's say around 1 AMP. 10. 3 taco water pumps, around 0.7A for 2 and 1A for the 3rd. So the equipment alone without lights and anything else connected to outlets is using around 9.4amps. After buying a similar disconnect I realized I want to move it outside the greenhouse but still on the corner of the greenhouse to decrease the moisture exposure and seems like a bad idea to operate a shutoff while standing in water. The current conduit turns out to be trashed, apparently crimped underground right before it comes up to enter the house. So this is looking more like a complete rewiring from the junction box at the corner of the house to the greenhouse so now I'm questioning the whole plan. Sorry, I don't have the amp-rating of the breaker in the main breaker panel, I think it is either 15A or 20A but I know that is pretty important. Other places in the forum say anything above 20A needs a subpanel for sure. Questions: Can a fused shutoff be used on an outbuilding without a subpanel? If I could use a fused shutoff would I need to put it yet-another-grounding-rod at the greenhouse? Otherwise can a subpanel be wiring into a 20A or 30A breaker? Thanks.

My exhaust fan works when plugged into a nearby receptacle, but will not work using the wires that lead to the fan. There is current on the black and white wires (@120-124 volts), so I don't know why it will not work on that line. Two electricians have tried to resolve it, but not successfully, saying I should just have a new line to lead to the fan. While this may be the resolution, why won't it now work? It was working in the summer (last use) so I thought the fan motor just burnt out. I was surprised that it worked elsewhere. Also, the second electrician replaced the pull chain switch and the fan receptacle, but still no dice.