30a 240v air compressor circuit
Wiring for future compressor at link below:
Before I insulate I want the circuit run to the compressors future home. I dont see much data there regarding the loads but it says 30a 240v. I know I need 10 ga cu but...
From my minimal experience... All dryers require 4 wires. Some welders require 4 wires (most do not). Ive never seen a 240 compressor require 4 wires. agree?
So do I run 10-2 and plan to use black hot, white hot and bare ground?
or do I run 10-3 and then if I only need 3 wires cap the whites and use red hot, black hot, bare ground?
The reason I ask is one for cost, but also for safety and code. I know on a 120v circuit it is illegal to ever use a white as hot at a receptacle or appliance (light). You can in a switch box or junction box and mark with tape. So in the case of 10-2 one of the whites would be hot. Is the code different for 240v because it sure seems that Ive seen this before.
You only run the 3-wire stuff to your dryer because it is not straight 240. It's 240/120. Your compressor is straight 240, 30 amp, just like a water heater. Just run 10-2 to the compressor diconnect location, and remark the white conductor with black tape at each end. Code compliant and quite normal.
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