John / Reno
The pump bonding is elsewhere.
THIS OP is on point about SDS rules.
I can't scream it loud enough: there really is no subsitute for the NEC Handbook.
It not only saves you endless grief in the field -- it is a fantastic source for rebutting ignorant inspectors.
(I speak from experience.)
NOTHING makes an electrical inspector happier than to see that you have the NEC Handbook -- on site -- open -- and as a design guide.
As a professional educational aid -- it's the very, very, best.
You only have to buy one every three years.
The NEC Handbook is FANTASTICALLY more informative than the NEC Code itself.
It explains WHY the NEC is the code it is.
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As for spas -- hot tubs -- the players are (generally) W A A A Y behind the curve.
Faraday's law -- about induction -- is totally known with metallic conductors (silver, copper, gold, aluminum) -- but it also applies to SALTY WATERS.
Especially salty waters that circulate inside a TOTALLY insulating/ dieletric barrier.
The pumping action is (seemingly) trivial. But... it builds... and builds... and builds...
Until you get totally weird service calls about "phantom voltages"
There is NO direct conductor for such voltages!!!!!
Don't even look for it.
Check out how salty the hot tub is!
Get a clue.
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Though discovered by Faraday two-centuries ago, the motion of a CONDUCTING FLUID in a magnetic field eludes practically EVERYBODY.
That seems to include the NEC.
Last edited by Tesla; 11/19/14 07:34 AM.
