"RBM" rbm2(remove wrote in message
...
It's not abnormal. The motor probably draws around 400% of its running
current momentarily when it starts. I'm assuming this is an oil burner
motor with some circulators as well. Do you know if it is on a dedicated
circuit as the more taxed the circuit is when the motor starts, the more
noticeable the dimming would be. It is also possible that there is a
problem with the motor, which is something the oil burner service folks
can check for



I find it hard to believe a typical burner motor and pump would cause a
noticeable flicker on 200 amp panel. There has got to be a wiring problem
some where. A typical boiler set up may have a 1/3 HP motor for the boiler
and similar or less for the pump. 400% of 1/3 HP motor won't even max out a
twenty amp breaker!
I have equipment with 5 HP motors running in the shop, feed off of the
house's 200 amp panel. There is no noticeable flicker or dimming of the
lights when motors start.
Greg