I've read numerous "flickering lights posts" and the answers range from bad bulbs to bad wiring to a bad neutral. Here's what I've determined:
- They (the tenants) report it only happens when either the 3D printer or the clothes washer is running, but not the electric stove.
- It's all the lights throughout the house, and not just the LEDs.
- Moving the printer to a different circuit didn't fix anything.
- Even an incandescent bulb on a circuit less than 10' from the breaker panel flickers.
- The voltage at the panel when not flickering (measured just after the master breaker, hot to neutral): One leg 116.7v. The other leg 124.4
- The voltage at the panel when they are flickering (hot to neutral): One leg 118.8v. The other leg 126.4
- The voltage at the outlet of a flickering bulb: 118.8v.
- Previously we had a problem with the lights brightening when a load kicks in. We had an electrician out who found some iffy neutrals and other unrelated issues. He reseated the neutrals and the problem went away. But that's about when the flickering started.
- The house was built in 1964 and is located in the U.S.
So my question is: Who do I call next, the power company or an electrician?