"boden" wrote in message
...
I have a Nutone central vacuum on a dedicated 20 amp, 120v circuit. The
vacuum is spec'd to draw 12.6 amps (I measure it at closer to 13.5 amps)
but the starting current is close to twice that. Consequently the breaker
opens at least half the time at start-up.

How long has this been occurring? Perhaps something has changed? The three
easiest solutions a

1/ Tighten all the screws. The wires going to breakers in the panel often
get a little loose over time. Turn off the main power first!
2/ Does the Nutone have a capacitor type motor? It might be defective (the
capacitor).
3/ Try a new breaker.