Priority switch? (Lektricuty question)

Robatoy · 2005-02-03T21:37:13+00:00

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¿0Rob