Type USE For Generator Connection

[Seven-Delta-FortyOne]

When I install Generac, I usually use the GenCable, which is type TC-ER, and rated for direct burial.

When I install other types, usually it gets conduit and THWN-2. But I think that type USE direct burial from the generator to the exterior mounted ATS would be fine, if I was doing a direct burial method.

Only restriction I see is if the ATS were mounted inside a building, I would have to transition to SE or some other type of wiring to enter the structure.

 

[augie47]

Seems reasonable.
Since it would need protection where exposed you might consider using LFNC for the entire run if it's reasonably short and not subject to damage.

 

[Seven-Delta-FortyOne]

I usually sleeve the TC-ER in pvc and then transition to a short piece of LFNC. I always forget that a lot of LFNC is actually rated for direct burial.