Hydro pumps

[M. D.]

Has anyone ever seen a double insulated hydro pump motor ? or a hydro pump with a two wire attachment plug, or one that has no bonding lug??
or a set of instructions that do not require bonding?? I think the installation instructions need a tad bit more attention at "The Lab."

read the response to a question posed to Mark Ode @ U.L.

.....Since the UL standard that governs these motors doesn?t allow any metal parts of the motor to touch the water, under normal or fault conditions, it seems to me that you would never have to bond the motor, even if it is not double insulated. Is this the way you are reading it as well?

And his response was:

quote:I think you are reading it correctly. There have been double insulated pump motors with internal components that were not movable but must be connected to an equipment grounding conductor that was installed as a part of the cord supplying the motor. Internal metal nonmovable parts were then connected to the equipment grounding conductors. Some pump motor manufacturers were still supplying a three conductor cord to double insulated pump motors but were not connecting the equipment grounding conductor to anything inside but simply floating it inside. We have been discouraging this since a double insulated motor with no metal parts does not need this three conductor cord. Any metal part that could be energized and in contact with the water must still be connected to an EGC even for a doulbe insulated motor.

Relating to the Panel 17 action, I wholeheartedly agree that a double insulated motor must not be bonded since trying to bond it would result in defeating the double insulation on the motor. All other circulating motors in a hydromassage bathtub are connected using a nonmetallic piping system, and again, the possible leakage to the water of any current affecting the user would be almost impossible.

I have been working for a few years now and I can't recall ever having seen hydro pump motor without a bonding lug so what gives. Am I just not seeing them or are they not out there???