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277V Three-Phase Wye-Connected
With a Wye-connected secondary, any leg
along with neutral can be used to provide
277V to the Wall Connector. For example, L1
and N, or L2 and N, or L3 and N.
277V
480V
277V
L1
NEUTRAL
L3 (NOT USED)
L2 (NOT USED)
GND
Caution: The unused legs (L2 and L3 in
the illustration) must remain open. Do not
connect to neutral or to earth ground.
Caution: The center point of the three
phases (normally used as neutral) must
be grounded to earth at only one point.
This is usually at the breaker panel.
Planning Your Installation
Planning Your Installation
9
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