Idiomas disponibles
Idiomas disponibles
CAUTION: This is a single-phase device. Do not connect all three phases of a three-phase feed! You may use any
two phases of a three-phase wye-transformer feed. The center point of the three phases (usually used as Neutral)
must be grounded somewhere in the system. A Neutral connection is not required by the EVSE. Only Line 1, Line 2,
and Ground are required, as shown in Figure 3.
CAUTION: The two phases used must each measure 120 V to Neutral. Earth Ground must be connected to Neutral at
only one point, usually at the service entry breaker panel.
CAUTION: If a 240 V three-phase feed is from a Delta-connected secondary, the leg used must have a center-tap.
That tap must be Grounded. Only the two phases on either side of the center-tapped leg can be used. See Figure 4.
CAUTION: Warranty is void if this unit is not wired properly.
WARNING: Only a qualified electrician should perform the installation. The installation must be performed in
accordance with all local electrical codes and ordinances.
Only three wires are connected, but care must be taken that the service transformer secondary connection is definitely
known, and the three wires from the main circuit breaker panel are connected and labeled correctly. Figures 2, 3, and 4 show
the most common service transformer secondary wiring formats.
Notice that L1, L2, and Ground are labeled on each diagram. Those transformer outputs correspond to the same inputs
on the HCS. Also, each of the two three-phase diagrams shows an L3 output, which is not used. Do not connect all three
phases of a three-phase secondary to the EVSE. This is a single-phase device.
The Neutral at the service panel must be connected to Earth Ground somewhere in the system on any of the three
connection arrangements. Ground-fault protection is not possible unless the Neutral (center-tap on the service transformer)
is connected to an Earth Ground. If no Ground is provided by the electrical service, a grounding stake must be driven into
the Ground nearby, following local electrical codes. The grounding stake must be connected to the ground bar in the main
breaker panel and Neutral connected to the Ground at that point.
WARNING: Local electrical codes must always be followed when installing the grounding stake.
14
© 2024 Enphase Energy Inc. All rights reserved.
HCS Installation and Operation Manual
January 2024
1140-00277-03
