AFCI breakers and Dimmers

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I don't know how an Electrical Contractor can make a living these days. You wire a new house and are required to install AFCI /GFCI, then months later you are on the hook when the homeowner calls you at midnight that the circuit breaker keeps tripping. Then a month later the LED lamps you installed are now blinking.
 
Bama_Electrical said:
What’s odd to me is that each of those rooms are on separate panels, not just different circuits.
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LarryFine said:
In a low-impedance system, those few feet don't make much of a difference.
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Yes, the few feet of conductors that connect the panels together are going to have a very low impedance.
When a dimmer is switching to produce a variable duty cycle waveform, there are higher frequencies associated with the fast rising and falling edges on the waveform. It's very possible that the source impedance from the POCO transformer and service wires is significantly larger at these higher frequencies than at 60Hz, and this could allow switching noise from a dimmer on one circuit to interfere with a dimmer on another circuit.

As mentioned above, there are devices that provide a minimum load on a dimmer to maintain some current when the AC voltage gets close to zero so that it can continue to operate properly during this interval. This can help in preventing flickering induced by the dimmer when it only has LED loads, which seems to be a problem in this case. If there are multiple LED bulbs on each circuit, you could try replacing one of the LED's on each circuit with an incandescent bulb. If this eliminates the flickering, then there's a reasonable chance that a minimum load device would also fix the problem. The Lutron LUT-MLC at the link below is such a device.

https://www.amazon.com/Lutron-LUT-M...f3-8472-45b0d28fe117&pd_rd_i=B01E9F084E&psc=1
 
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