enphase HCS EVSE Serie Manual De Usuario página 15

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
Ground at that point.
WARNING: Local electrical codes must always be
followed when installing the grounding stake.
The following diagrams illustrate the three service transformer
secondary connections most common in North America.
Figure 3: 220/240V Single Phase
120V
NEUTRAL
(NOT USED)
120V
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HCS EVSE User Manual
L1
240V
L2
GROUND