Bonding & GroundingCommented on: 5 weeks ago (October 30, 2016)
It sounds like you are missing the ground at the service main where the neutral conductor should be connected to earth, just like a control transformer 230V-115V and unless the neutral is grounded...
Motors & Motor ControlsCommented on: 7 weeks ago (October 13, 2016)
Check out your safety circuit for a loose connection. You could also have a loose mounting bracket on a door.
Sounds like me...my name is Jerry and on several occasions my company was rewarded contracts for all of the above reasons. Most of all the NEC states, "in a neat and workmanlike condition," which...
Also, when using a hole saw either drill a pilot hole or use a fender washer to prevent the pilot bit from breaking when the holesaw makes contact with the enclosure.
Check all your incoming 3-phase power. The problem is probably due to poor or loose connections due to the fact that is the same with all the motors. Also, heater sizing and ambient temperature...
that installation is so that they can turn on only half of the lighting fixtures