©
2015 Sensata Technologies
9
2.0 Installation
2.3
Wiring the Inverter – General Requirements
This section describes the requirements and recommendations for wiring the
CSW2012-X inverter. Before wiring the inverter, carefully read all instructions.
The NEC (National Electric Code, ANSI/NFPA 70) for the United States and
the CEC (Canadian Electrical Code) for Canada provide the standards for
safely wiring residential and commercial installations. The NEC/CEC lists the
standards for wire sizes, overcurrent protection, and installation methods
and requirements.
Inverter/charger systems involve power from multiple sources (inverter,
generator, utility, batteries, solar arrays, etc.) which can make the wiring
more hazardous and challenging.
WARNING:
Ensure all sources of DC power (i.e., batteries, solar,
wind, or hydro) and AC power (utility power or AC generator) are
de-energized (i.e., breakers opened, fuses removed) before pro-
ceeding—to prevent accidental shock.
WARNING:
Wiring should meet all local codes/standards and be
performed by quali
fi
ed personnel (i.e., licensed electrician).
2.3.1 Wiring
Requirements
•
All conductors that are at risk for physical damage must be protected
by tape or placed in a raceway.
•
Always check for existing electrical, plumbing, or other areas of
potential damage prior to making cuts in structural surfaces or walls.
•
Use only copper wires with a minimum temperature rating of 75° C
(194° F).
•
Do not mix AC and DC wiring in the same conduit or panel unless
specifically approved/designed for both AC and DC wiring. Where
DC wiring must cross AC or vice-versa, try to make the wires at the
crossing point perpendicular (90 degrees) to one another.
•
Both AC and DC overcurrent protection must be provided as part of
the installation.
•
The inverter requires a reliable negative and ground return path
directly to the battery.
2.3.2 Torque
Requirements
All wiring to the AC and DC terminals should be checked periodically (once a
month) for proper tightness. For the torque requirements, refer to Table 2-1.
If you don’t have a torque wrench, ensure all connections are tight.
Table 2-1, Torque Requirements
Terminal
Size
Torque
Requirements
Tool Size Needed
AC Terminals
(AC input/output)
M3.5 × 7
screws
5 - 8 lbf-in
(.6 to .9 N-m)
fl
at-head screwdriver
(2.9 to 3.5 mm blade)
DC Terminals
M8 x 1.25
Hex nuts
16 to 21 lbf-ft
(21.7 to 28.5 N-m)
13 mm wrench
DC Ground
M6 x 1.0
Hex nut
79 to 96 lbf-in
(8.9 to 10.9 N-m)
10 mm wrench
