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IQ EV Charger User Manual
CAUTION: This is a single-phase device. DO NOT
connect all three phases of a 3-phase feed! You may use
any two phases of a 3-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 120V
to Neutral. Earth Ground must be connected to Neutral at
only one point, usually at the service entry breaker panel.
CAUTION: If a 240V 3-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: The 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, & Ground are labeled on each diagram. Those
transformer outputs correspond to the same inputs on the IQ EV
Charger. Also, each of the two 3-phase diagrams shows an L3
output, which is not used. DO NOT connect all three phases of a
3-phase secondary to the EVSE. This is a single-phase device.
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