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Jim, is it not allowable to use romex through the building and then transition to a conduit system exiting the building?Type UF cable cannot be used to feed your hot tub. The wiring method needs an insualted grounding conductor. You will need to use some sort of conduit and individual conductors in the proper sizes and colors.
The ampacity difference might be with reduced or no heater.
Marc, This is one of the details I need from you guys.For the rest details I will wait until you make plans where to put the spa and if you going to pour cement pad or use wood decking or other means there are few diffrent leigt metholds to do this and for the equipotential bonding the conductor size have to be #6 bare copper AFAIK.
interior wiring!jim et. Al, i was planning on sched 80 pvc underground for the uf. Would that be ok for the uf, or do i need to get thwn with insulated ground. I did read about the ground being insulated, but the code does say that the outer sheath can be used to as the insulation:
"interior wiring for outdoor spas or hot tubs—any wiring method, which is outlined in a previous chapter of the nec, containing a copper equipment grounding (bonding) conductor that is insulated or enclosed within the outer sheath of the wiring method and not smaller than 12 awg is permitted for the connection to motor, heating and control loads that are part of a self-contained spa or hot tub, or a packaged spa or hot tub equipment assembly."
Jim,IIRC the tub will need the grid either in the dirt under wooden pavers or patio blocks. The grid would need to tie into the slab and any conductive surface near the tub.
OK, so a #8 bare? Do I dig a trench around the perimeter of the tub? How deep should this wire be buried? Does this wire attach to the tub; where?I was referring to the equipotential grid or wire around or under the hot tub. Some editions of the code required a grid, some just a #8 buried around the perimeter.
Jim Port did cover that details pretty clear and you can not miss that by that much. it is a direct answer from NEC codé.Marc, This is one of the details I need from you guys.
1. May the tub sit on the concrete part of the patio right outside the sliding door, or are there space requirements for the perimeter of the tub?
2. If I move it further away and place it on a concrete slab, is there extra bonding required (a la eqipotential bonding)?
3. Are there other (non-conducting) underlayments available for these installs? Non-conducting pads, etc.?