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5.2 Grid & ATS Monitoring Cables
5.3 AC Power Wiring
IMPORTANT! Do not terminate fine stranded cable in the connectors without the use of ferrules.
CAUTION! To reduce the risk of fire, connect only to a dedicated circuit provided with appropriate
branch circuit over-current protection in accordance with local electrical codes.
WARNING! Improper connection of the wiring panel may result in equipment damage and cause personal
injury. Disconnect all AC and DC Sources prior to installation.
CAUTION! The AC load feeds a dedicated backup sub-panel, the source of which is controlled internally
by an automatic bypass and transfer switch. Do not tap line or neutral wires directly from the main
electrical panel to the backup panel. The neutrals of both panels must be electrically isolated for safe
operation.
5.3.1 Phase Orientation in Split Phase 120/240 Systems
The EMC derives power measurement at the main service, the solar
PV inverter AC output, and the ESS. Consistent phase voltage
orientation through the entire installation is critical to proper
control of the system. The initial selection of the phase voltage
defined as L1 is established by the placement of the CT referenced as
CT1 on the main feeder to the panel. To ensure the phase wiring to
the Power Center™ Hub maintains consistent polarity, measure the
AC voltage between L1 of the main feeder and the Grid terminals of
the Power Center™ Hub. The pole that measures 0.0 VAC is defined
herein as L1 for the AC wiring instructions that follow.
ATS-Rel
Sense
| ATS coil
L1 N L2 L1 L2
Figure 12: Defining L1 with CT1 in the main panel.
Status
Harness
O
I
C
N
O
I
A
A
o
o
H
H
Figure 11: Grid and ATS monitoring cable
L1
11
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