Dryer Shock

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fab5454

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Hi. I recently installed a dryer in my son's apartment. The apartment was a refurb so everything from wiring to venting looks new. The wall outlet is a 4 prong. I checked the outlet. The two
hot wires are in the correct locations. I hooked up the new 4 wire cord. Red to the left hot connection. Black to the right hot connection. Neutral white wire to the center. Since the dryer
is older, it had a bonding strap (neutral to frame). I removed the bonding strap and connected the 4th green ground wire to the frame. When hooking up the vent pipe I touched the metal
dryer vent pipe and got a low grade shock. Once the shock is gone, it doesn't appear to come back unless the vent pipe is disconnected. This is very puzzling. Not sure where to turn. I
don't believe there are any bad frayed or disconnected wires anywhere. I took the panels off and looked. Any thoughts? Not sure if I should have an electrician look at this (who can't do
dryer repair) or an appliance person (who can't do electrical code work). Thanks.
 
Measure voltages. Possibly the EGC in the receptacle is not connected.
Possibly the dryer vent pipe is somehow being energized.
Not enough information yet.
 
Sounds like there is neutral current on the grounding conductor and there is a difference in potential between the vent pipe and grounding conductor
 
I'd bet the ground connection on the receptacle is not connected to anything. At least not to a proper grounding conductor.


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