Just another thought that popped into my mind. While you may have a 200 amp
service, which is 4/0 aluminum or 2/0 copper conductors on your house, the
wire that the utility company uses and the distance you are from the
transformer can have a huge impact on voltage drop and dimming. Years ago I
worked at a very old house which had a 200 amp service, terrible dimming
problems. The wire from the utility company ran for 1000 feet before it
reached the transformer and was #6



"RBM" rbm2(remove wrote in message
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Yes, I'd check the connection on the circuit breaker and on the neutral
buss. However, if it's several reflector floods, like in recessed lights,
it doesn't take much of a surge to cause them to dim slightly



wrote in message
oups.com...
Ok, I think I may have isolated the problem.

There is a single circuit in the house that dims when a high load turns
on anywhere in the house. I managed to cycle the boiler and it caused
the lights to dim. I then powered on a table saw and it also caused
lights on the suspect circuit to dim.

How do I troubleshoot this circuit?

Should I start in the panel and work backwards?

The circuit has aluminum wires that are spliced to copper with the
special purple wire nuts used for AL-CU connections.

Michael