I ran across a hot tub that requires a 240V 50A feeder. The problem is the control panel has no provisions to terminate a raceway, no knockouts. All it has is a clamp the says turn one way for #6 and turn the other way for #8 wire. It works along the same lines as a cord cap clamp that secures a cord.
The factory told me the unit was not made to cord connect and just stop the conduit off and run an open cable into the clamp on the control panel. They did not see a problem. I told them it must have a raceway to the control panel or be cord connected but the receptacle must be min of 5' form the tub wall, be single locking and GFCI. They told me the tub was not meant to be hardwired. I told them there was no code compliant way it could be done. They told me I did not know what I was talking about when I told them it must have a hard raceway with an insolated grounding conductor except for the last 6' could be sealtite. I told them only that in the dwelling portion to the disconnect could be NM cable.
They thought I had lost my mind and this was done everywhere. They said another alternative could be to just have open THHN within the tub skirt and just stub out the 1" conduit in the tub. 680.42 states it shall comply with parts I and II of art 680. It got really bad on the phone. This guy really thought I was in left field. Any thoughts. He got tired of arguing and said he would have an engineer call me.
From the looks of the fifth pic, you could probably bring in THHN in the blue nonmetallic flex ("smurf tube"?) which looks like it would fit into the clamp....
Sounds to me like the manufacturer is the one who doesn't know what they're talking about....and that's one crowded control box!! (Being plastic and mounted directly on the inline heater is a nice touch..)
Stupid should be painful.
#120069 - 02/26/0502:39 AMRe: Need Help on Hot Tub Wiring Method
Wow, that brings back memories. I had to wire the same control panel on the same spa for a friend. I had the exact same problem.
I concluded that the controll panel was made to IEC standards (metric) and that's why the 3/4" non-metallic liquidtight connector would not fit into that "knockout" or cable clamp or whatever the heck that is.
I got so frustrated that I just ran the liquidtight right up to the box without a connector and threaded the conductors through the opening without tightening it.
Yes, it was hack to do that but I had no options. I didn't see a problem because the enclosure was all plastic.
That thing really needs to be redesigned. Those cheesy plastic lug connectors felt like they were going to snap right off when I was tightening down the #6.
#120073 - 02/26/0502:54 PMRe: Need Help on Hot Tub Wiring Method
Here on the coast of NC, i've done hundreds of Hot tubs for the rentals here. Most are pretty easy but i have done that modle befor, and yes they are all a pain in the arse.
There is a few ways of doing this, all reaquireing some modifiying....its the only way to make it work. If you realy want to use the hoel that is supplied with the clamp the only way is to use a unibit of sort and resize the hole to fit 3/4. If you cut away some of the inside you can fit a lock ring down in and spin the flex connector on, this is useing plastic gray carlon.
The better way i have done in the past and seems to hold up is to relocate that top connector down, shift them all and leave the bottom one inside the control box, for some reason they all have that one left out. You can fit a 3/4 flex connector in the top of the control to the left of the door hinge. The only problem there is you have open holes left in the box now.
Anyway you look at it, the manufacurer wasn't looking out for ANY electrician. Basicly not instalable in there means.
#120075 - 03/08/0505:37 AMRe: Need Help on Hot Tub Wiring Method
Raceway. An enclosed channel of metal or nonmetallic materials designed expressly for holding wires, cables, or busbars, with additional functions as permitted in this Code. Raceways include, but are not limited to, rigid metal conduit, rigid nonmetallic conduit, intermediate metal conduit, liquidtight flexible conduit, flexible metallic tubing, flexible metal conduit, electrical nonmetallic tubing, electrical metallic tubing, underfloor raceways, cellular concrete floor raceways, cellular metal floor raceways, surface raceways, wireways, and busways.