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Although I have seen alot of strange and downright dangerous wiring jobs, I have never seen anyone try to accomplish the load demand this way (doubling up on undersized conductors). Have you?
: From a technical standpoint, doubling up a #12 wire and creating
: parallel circuits will double the ampacity of that circuit. The
: problem is that in order to be code compliant, you must install the
: tub according to the manufacturers instructions. To the best of my
: knowledge, the only manufacturer currently using parallel circuits in
: their tubs is Watkins, the manufacturer of such brands as Hot
: Springs, Tiger River, Caldera, etc. The NEC is quite specific that
: you must wire according to the manufacturers instructions. If they
: call for minimum 6 AWG and/or a certain wire type, then you had best
: follow the directions.
PLEASE NOTE: We are Roberts Hot Tubs Inc. (manufacturers of traditional wooden hot tubs)! If you found this webpage through a search engine while searching for a different brand of spa, we are not them! We simply appeared in your search due to that name being talked about on this particular web page. The phone number below will reach Roberts Hot Tubs, not the manufacturer of the brand of spa you're searching for. This is a public forum and you're more than welcome to post a question asking for contact or other information for a particular brand of spa. Almost certainly someone will be able to assist you.