Who said spas are UL listed? Most manufaturers do not list their products.
The idea of sending an unprotected feed anywhere near the spa concerns me.
If we're talking about an "emergency" disconnect, well, those are required only for commercial installations. This requirement came about after several folks drowned after getting stuck on the suction inlet. Residential spas don't have those monster pumps....
In any event, spa dealers have disconnects available, that typically use air to operate a remote-located switch, thus removing electricity from the equation entirely.
