Bradford White DB-80R3DS - Manual (Page 3)

GENERAL INFORMATION
120 VOLT
Ungrounded
Grounded
(Neutral) Grounding
BLACK
WHITE
GREEN
120 0
120
240 VOLT
Ungrounded Ungrounded Grounding
BLACK RED GREEN
240 120
120
120
A B C Neutral
RED BLACK RED
120
120 208
208 208
208 3Ph
277
A B C Neutral
RED BLACK RED
277
277 480
480 480
480 3Ph/277 1 Ph
120
A B C Neutral
RED BLACK RED
120
120 240
240 240
240 3Ph
Common Service Wire Configurations
Amps = Watts (for single phase units) Example 4500W/240V = 18.75A
Volts
Amps = Watts (for balanced 3 phase units) Example 4500W/240V 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
2
2
Commonly Used Formulas
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