Possible Causes



Neutral-to-Ground Fault

A fault between the neutral wire and the ground wire can cause the voltage on one of the hot legs to increase when a motor starts. This occurs because the motor's high current draw creates a voltage drop on the neutral wire, which in turn increases the voltage on the hot leg connected to that neutral.

Reverse Wired Neutral

If the neutral wire and one of the hot legs are accidentally reversed, the motor's current will flow through the hot leg that should be carrying the neutral current. This can cause the voltage on the reversed hot leg to increase, leading to brighter lights.

Overloaded Circuit

If the circuit supplying the motor is overloaded, the voltage drop on the neutral wire can increase as the motor starts, causing the voltage on the other hot leg to rise.

Loose or Defective Connections

Loose or defective connections at the panel, meter socket, or anywhere in the wiring can introduce resistance that can cause voltage drop and brighter lights. If all other connections are checked and verified as fine, it's worth inspecting the connections at the motor.

Troubleshooting Steps



Check for Neutral-to-Ground Faults

Use a multimeter to check for continuity between the neutral and ground wires. If continuity is detected, there may be a fault.

Verify Neutral Wiring

Confirm that the neutral wire is properly connected and not reversed with a hot leg.

Inspect for Overloaded Circuits

Determine if any other appliances or loads are using the same circuit as the motor. Remove or reduce loads if necessary.

Tighten Connections

Inspect and tighten all electrical connections, including those at the panel, meter socket, and motor.*

Consider Consulting an Electrician: If the troubleshooting steps above do not resolve the issue, it is recommended to contact a qualified electrician for further diagnosis and repairs. Flag for review