enphase HCS-40 - Page 15

© 2024 Enphase Energy Inc. All rights reserved.
January 2024
140-00277-03
15
HCS Installation and Operation Manual
L1
L2
NEUTRAL
(NOT USED)
120 V
120 V
TERRE
240V
GROUND
Figure 3: 220 V/240 V single phase
The following diagrams illustrate the three service transformer secondary connections most
common in North America.
Figure 4: 208 V three-phase, wye-connected
L3 (NOT USED)
L2
L1
GROUND
NEUTRAL
(NOT USED)
120V 208V
120V
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.