A coworker installing equipment in China was getting shocked on a computer rack. The electricians checked the power circuit and insist that everything is right. I told him to check the ground connection in the outlet box that the UPS from the rack plugs into. The box was not bonded to ground. He added a bonding jumper in the box and does not get shocked any more, but there is 3V between the ground and neutral wires. Should we be concerned about this?
3V neutral to ground
- Thread starter sgokie
- Start date
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NoVA Comms Power
Senior Member
- Location
- Alexandria, VA
Are you sure that that the premises system even uses a grounded neutral conductor?
- Location
- Illinois
- Occupation
- retired electrician
If this is wired like our systems here in the US, that voltage reading is the voltage drop on the neutal conductor.
Don
petersonra
Senior Member
- Location
- Northern illinois
- Occupation
- engineer
sgokie said:
Are these Chinese electricians? having had some experience with Chinese electricians, I would take any utterance from themwith many grains of salt.
RayS
Senior Member
- Location
- Cincinnati
hmmm, 'round here you can't bond the ground and neutral except at the service- kinda hazardous if the neutral gets broken and lights up the equipment grounds
Where is the 3-volts being observed? Is the source neutral bonded to ground?
If the 3-V is measured at the point of use, and the supply source neutral is bonded the same way we do here in the US, then you are just seeing the normal I*R drop (voltage) developed on the neutral from the source to the load.
If the 3-V is measured at the point of use, and the supply source neutral is bonded the same way we do here in the US, then you are just seeing the normal I*R drop (voltage) developed on the neutral from the source to the load.
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