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HCS installation and operation manual
The following diagrams illustrate the three service transformer secondary connections most
common in North America.
NOTE: With a wye-connected secondary, any two of the legs can be used to provide 208 V to the HCS. For example,
L1 & L2, or L1 & L3, or L2 & L3. Leave the unused leg open. Do not connect it to a Neutral bar or to Ground. Be sure
the center point is grounded to Earth somewhere in the system.
June 2024
140-00277-04
120 V
NEUTRAL
(NOT USED)
120 V
Figure 3: 220 V/240 V single phase
L3 (NOT USED)
120 V
120 V
Figure 4: 208 V three-phase, wye-connected
© 2024 Enphase Energy Inc. All rights reserved.
L1
240 V
L2
TERRE
GROUND
L1
208 V
NEUTRAL
(NOT USED)
L2
GROUND
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