GENERAL INFORMATION
120 VOLTUngrounded
Grounded
(Neutral) Grounding
BLACK
WHITE
GREEN
120 0
120
240 VOLTUngrounded Ungrounded Grounding
BLACK RED GREEN
240 120
120
120
ABCNeutral
RED BLACK RED
120
120 208
208 208
208 3Ph277
ABCNeutral
RED BLACK RED
277
277 480
480 480
480 3Ph/277 1 Ph
120
ABCNeutral
RED BLACK RED
120
120 240
240 240
240 3PhCommon Service Wire ConfigurationsAmps = Watts (for single phase units) Example 4500W/240V = 18 .75A
Volts
Amps = Watts (for balanced 3 phase units) Example 4500W/24 0V x 1.732 = 10.82A
Volts x 1.732
Watts = Amps x Volts Example 18.75A x 240V = 4500W
Ohms = Volts Example (240V) / 4500W = 12.8 Ohms
Watts
22
Commonly Used Formulas
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