:wink:Thanks. The THWN is in conduit (outside). The black, white, and green are run through the conduit to the switch. The green is attached to the grounding screw on the switch.
And then the green continues to the receptacle.
From the switch I've run the black, white, and green to the "twist lock" receptacle. I have the green attached to the grounding screw on the "twist lock" receptacle...... in the weatherproof receptacle box.
So...where to from here?
Just like in the switch box the green continues on to the motor. The male end that plugs into the female twist lock recept has a green wire too. This green in the male plug cable is what goes to the ground screw in the motor. I hope this clears it up for you. You must not have the male plug and cord. If you did you would not have needed to ask this question, right?
Many, many, thanks.
Yep, you got it but you may not understand it..... Any fault to the metal of the motor case will cause the fault current to flow to the green screw then to the green wire of the twist-lock power cord, then to the receptacle then to the equipment ground of the motor branch circuit wiring back to the panel neutral bar then out to the transformer center tap over the service neutral. This low impedance path back to the source (transformer) allows enough current to flow through the gfci breaker during the fault to trip it out.Thank You.
With regard to the below statement
"So two things at the motor....the equipment ground of the cord and plug terminates (ends) on the motor wiring compartment green grounding screw. Nothing else continues on from that green screw. The #8 bonding wire is connected to the lug on the outside frame.......your done."
Do you mean that the cord coming out of the motor (which has a green connected to the ground screw in the motor housing) with the twist lock plug, is essentially my "completed ground"....when it's plugged in to the twist lock receptacle?
No I'm not saying he should bypass the receptacle ground. Wired correctly, the twist lock plug and receptacle will have the ground present and no other ground connections are needed. (excluding the bonding system). What I tried to convey is if he has a metal box it needs grounding too. Thats why I suggested he pigtail the EGC and bond the metal box. If it's plastic he does not need to break the EGC. The twist lock plug and recept will deliver the EGC to the motor.JV, take another look at this. The way I read it, he has a properly grounded outlet & a pump that has a proper 3 wire cord & plug:
The grounding screw does have a green that runs from the screw up through the cord.
(and I'm presuming is properly attached to the plug)
It seems to me you're advising that he bypass the grounding prong of the plug in favor of hard-wiring the ground.