680.42 Outdoor Installations. A spa or hot tub installed outdoors shall
comply with the provisions of Parts I and II of this article, except as
permitted in 680.42(A) and (B), that would otherwise apply to pools
Ok I think it's all just about set, just one last question: I have to enter
the tub opposite from the termination point, and am wondering the easiest
way to handle the run on the inside of the tub enclosure. The run is about
12' to the control box, and there are some pumps and other stuff in the way
in between. I am pretty sure the enclosure is not an approved raceway. I
am not sure if splices in this run are permitted, but it certainly would
seem easier to set a j-box, run an SO cord or use another flexible
nonmetallic method inside the tub rather than try to snake PVC through it.
The run is too long to use liquidtight flex.
Thanks much for all the help.
he NEC requires the ground to be unbroken. That is tough but not impossible
to do with a subpanel. Impossible if you change wiring types. Dig around the
outside and install the wireing to the code. Changing types of conduit is
not against the code. There are several plastic flex's available, called ENT
if I remember correctly. That might solve your problem and meet the code.
As far as I know, the ground is normally broken at the subpanel to ground
the enclosure. I believe a ground can be legally spliced with a crimp or
welded connection, but my main concern is if the NEC actually prohibits
making a splice in a feeder (not just ground) to a hot tub or spa, and
furthermore if a cord is even permitted (I'm guessing not.)
Really I'd prefer not to have to make any splices, and just run the THHN the
whole way. There is no access to re-dig the trench to run it directly to
the controller access. The length of the run that would need to be in
liquidtight flex (inside the tub enclosure) is 12', and as far as I know,
that is above what the code allows in that type of conduit. Is there
another type of plastic flex that does not have that same restriction? Is it
permitted to run successive lengths of plastic flex with a j-box in between
to effectively reduce the contiguous length and get within the NEC
I always thought the limit was 6 ft. but looking at the code it looks like
there is a section that indicates it is permitted. . .
356.10 Uses Permitted. . .(LFNC article)
(5) Type LFNC-B shall be permitted to be installed in
lengths longer than 1.8 m (6 ft) where secured in ac-cordance
Which indicates as long as it is supported every 3 ft. and within 1 ft. of
the fittings and boxes that it is ok. I'm gonna go with it.
Again, thanks this is a great resource
wrote in message
The conduit rules for hot tubs are more stringent than the normal raceway
use rules. I think you'll need either a long cord, or limit yourself to 6
feet of flex. Ref:
680.42 (A) Flexible Connections. Listed packaged spa or hot tub equipment
assemblies or self-contained spas or hot tubs utilizing a factory-installed
or assembled control panel or panelboard shall be permitted to use flexible
connections as covered in 680.42(A)(1) and (A)(2).
(1) Flexible Conduit. Liquidtight flexible metal conduit or liquidtight
flexible nonmetallic conduit shall be permitted in lengths of not more than
1.8 m (6 ft).
(2) Cord-and-Plug Connections. Cord-and-plug connections with a cord not
longer than 4.6 m (15 ft) shall be permitted where protected by a
ground-fault circuit interrupter.
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