I saw a hydro massage bathtub on a rough inspection the other day. The motor was all plastic, no metal on it, even the mounting plate was plastic and it had a 3 prong plug. There was no place for a bonding wire, but it didn't say double insulated. Does this need to be bonded? I told the GC that for the final inspection, I want the EC to be there and with the book to check the Manufactures requirements.
I just put one in last week. There was a lug on the motor but other than that it was all plastic and self contained; however, a hydromassage tub differs from a self contained hot tub/spa in that the water fill is from a spigot and faucet set not from within the fiberglass tub itself. My local AHJ wanted a bond to the metal parts of the spigot/faucet set. I'm not sure I agree with him technically, but his theory (NEC required or not) was sound so I didn't argue ... besides the #8 solid cost me a whole $3.54 (including tax and the clamp) and took 15 min to install.
Harold: I had the same item today on a rough. There is NO lug on the motor assembly. The HO had the mfg paperwork (three languages), and I looked thru it briefly; NO mention of bonding at all.
This is a "HO" job; no EC, a brave guy doing a big add-a-level & addition. He was/is going to call the mfg help line to get some info on the motor assembly and supply me a copy. Told him the metal piping required bonding, and to call me when he has the info.
All-in-all, for a DIY HO job, it wasn't bad. Guy wired outlets/lights in 12 ga; 10 ga to the jacuzzi....8 to the hvac.
even thru i did install few new spa tubs which it have double insluated motor[s] but have to bonded any metal enclosure including the heater i ran plenty #8 wire there and leave extra near the motor in case it have to be replaced in future which it will happend anyway
Pas de problme,il marche n'est-ce pas?"(No problem, it works doesn't it?)
Harold: Yes, had the red & blue, the HT was NOT double insulated, so the motor lug went to the H&C 'tails' going to the faucet assembly, it is metalic piping. I thought about the "4 sq inch or larger", but no one presented any arguments.