My client had a back up generator installed and hired me to inspect it.
Net currents of up to 12 amps were measured on circuit conduits. NEC Code compliant installations will have no net currents on conduits.
After sharing my measurement findings, photos and videos of the backup generator transfer switches and related connection to the service panel with several Electrical Engineers and senior troubleshooting electricians I suggested, to my client, the following possibilities as a root cause of the measured net currents.
1) The installing electrician reasoned that since they were using two pole transfer switches, only the two hot wires had to go over and back, so he left the neutrals out of the conduits. This is what they did with the stage lighting I worked on. NEC 300.3(B)(1) (This is analogous to using 2 conductor cable for wiring 3-way switches, where there is no neutral run along with the travelers.)
2) He ran A phases out and back in one conduit and B phases out and back in the other. NEC 300.3(B)(1)
3) He ran both neutrals over and back to the transfer switches in the same conduit. NEC 300.3(B)(1)
Suggested Solution: have the installer return and check to see if all his connections meet code: fix and repair as required to stop net currents as measured by a flexible amp clamp. NEC Code compliant installations will have no net currents on conduits.
For information on detecting, measuring, tracing and fixing wire code violations and exposure to other EMFs contact:
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