This has probably been asked before, but I need a definitive answer: Per 1999 NEC (and 2002) am I allowed to use NMC in a Single Family building to feed a Pool Motor or a Hot Tub that is located outside the building. The NMC will run to an interior Junction Box where the wiring method will transition into RNC (PVC)-and-THHN to the exterior. For clarification: the Pool Motor has a Single Pole Switch as the Disconnecting (plus GFCI protection and a Twist-Lock Cord & Plug), and the Disconnecting Means for the Hot Tub will be a 50-Amp GFCI Breaker in a Rain-Tight Enclosure.
Loc: San Carlos, CA
(1999) 680-25(c) - Methods of Grounding Motors
3rd paragraph - "in the interior of a one-family dwelling...any of the wiring methods recognized in Chap. 3 that contain a copper EGC that is insulated or covered by the outer sheath [read NM]...shall be permitted"
Thanks for answers so far BUT: I believe the intent of the NEC is to allow NMC in the Interior of a Single Family Building but why is it in the Pool Motor section and not for ALL Pool associated equipment? Or does it mean for MOTORS that are in the interior since it is only in the Motor Section?? And SOARS says “Note that this wiring method does not apply to the supply of spas and hot tubs that are located outdoors.” And the IAEI 1-&-2 Family book says: “….does not apply to branch circuits for spas and hot tubs. The electrical equipment that service spas and hot tubs commonly includes panelboards, control panels, motors and heaters.” Just some thoughts I get aimed at me. Any help will be appreciated.
I agree with you that if a MOTOR was wired, then NMC wire inside of a house would be OK as per, 680-25(c). However if there is a pool light or a sub panel, then 680-24(4)b) and 680-24(d) would not allow it. Then the pipe would have to be run inside of the house.
I can't look at your sections right now because my '99 is among the missing, But I agree with your comments. Since the question was specifically on Motors I did not delve into other things.
Is there still a restriction on installing wiring for Underwater Fixtures from some types of sub-panels? can't seem to spot it in the 2002 NEC.
In 680.23(F)(2) it requires an "insulated copper equipment grounding conductor installed with the circuit conductors".... and "without joint or splice" ... I don't see any mention of existing sub-panels, or other reference to the source of the circuit.
[This message has been edited by Bill Addiss (edited 05-07-2003).]
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