Bradford White RE1 Service Manual page 3

Commonly Used Formulas
Watts
Amps =
Volts
Watts
Amps =
Volts x 1.732
Watts =
Amps x Volts
Volts
Ohms =
Watts
WHITE
Grounded
BLACK
(Neutral)
Ungrounded
120
A B
Neutral
120
120
120 208
208
RED BLACK RED
(for single phase units) Example: 4500W/240V = 18.75A
(for balanced 3 phase units) Example: 4500W/240V x 1.732 = 10.82A
Example: 18.75A x 240V = 4500W
2
Example: (240V) / 4500W = 12.8 Ohms
GREEN
Grounding
0
120
Neutral
C
120
120
208
RED
GENERAL INFORMATION
2
BLACK
Ungrounded
240
A B C
120
240
240 240
BLACK RED
Page 3
RED GREEN
Ungrounded Grounding
120
120
Neutral A B
277
277
277 480
480
RED BLACK RED
C
480
3