Maybe you don't need any modifications. The starting surge of the
compressor is considerable but only lasts for a short time. If the lights
return to normal brightness when the comressor comes up to speed, you may be
OK without any changes. That is, unless you blow the breaker when the
heater, compressor and another power tool are all running at the same time.

"Robatoy" wrote in message
...
I have 30 amps of 220 (single phase) available to my shop.
When my electric heater (20 amps) is running, which isn't often because
the shop is very well insulated and my compressor (10 amps) kicks in,
..mmm let's just say.. the lights dim a little.

Neither piece of equipment runs a lot so I see no reason to bust open
the concrete driveway and burying cable to upgrade to a bigger service.
So.... it shouldn't be that hard to develop a relay box that simply cuts
off either piece of equipment when the other is running.... I mean...
shouldn't be that hard for somebody who knows this kinda stuff.

I would be helped a lot if there was name for such a circuit, because
then could start digging for a schematic.

Anybody?

Please?


0¿0

Rob