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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.
L3 (NOT USED)
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
L1
277V
480V
NEUTRAL
277V
L2 (NOT USED)
GND
Planning Your Installation
9
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