© 2024 Enphase Energy Inc. All rights reserved.
January 2024
1140-00277-03
16
HCS Installation and Operation Manual
Figure 5: 240 V three-phase, delta-connected, with center-tap on one leg
CAUTION: With the delta connection, one leg must be center-tapped. Only the two phases on either side of the
center tap can be used. The two phases must both measure 120 V to Neutral. The third line (L3) of the delta is
208 V, with respect to Neutral, and is sometimes referred to as a “stinger”. Do not use this third line! Consult the
transformer manufacturer’s literature to be sure the single leg can supply the required power.
CAUTION: A three-phase delta-connected transformer secondary without a center-tap on one leg cannot be used
with the EVSE. No “Neutral” point is available to be connected to the ground for ground-fault protection. The EVSE
will not allow the contactor to close if it does not sense the presence of a Ground wire connected to a “Neutral”
point on the transformer secondary.
120 V
120 V
240 V
NEUTRAL
(NOT USED)
L1
L2
GROUND
L3 (DO NOT USE)
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