Ditto JohnH, with the possible exception: Some units have an integral GFCI
device. The dryer circuit is definitely not useable
"JohnH" wrote in message
...

but a hot tub dealer mention the outlet might be 30amp, and the hot
tub is 50amp


You will need to run a 4 wire cable directly to the breaker box, connected
to a proper GFCI breaker, through a cutoff switch. Anything else will be
an unsafe rig.


http://www.spasupport.com/electrical...tallguide.html