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2.1.5 Wiring the Inverter
This section also describes the requirements and recommendations for wiring the MS-PAE Series
inverter/charger. Before wiring the MS-PAE Series inverter/charger, read all instructions.
All wiring should meet all local codes and standards and be performed by qualifi ed
personnel such as a licensed electrician.
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 requirement 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 make the wiring more hazardous and challenging.
The input and output AC and DC circuits are isolated from the inverter chassis. The inverter system
grounding is the responsibility of the installer in accordance with the NEC.
WARNING: To prevent accidental shock, 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 proceeding.
2.1.6 Protecting Wire – Conduit Box or Inverter Enclosure
The AC and DC wires into and out of the inverter must be protected by rigid tubing, as required
by code to comply with residential and commercial installations. This is normally done by feeding
the wires through conduit. Sensata provides a conduit box (ME-CB or MPX-CB), a single inverter
enclosure (MMP Series), and a multiple inverter enclosure (MP Series) that include knockouts
to conveniently accommodate AC/DC wiring enclosed and protected by conduit. The MP/MMP
enclosures also include the necessary AC and DC inverter breakers that allow both the AC and DC
conduit to be connected to the inverter.
2.1.7 Wiring Requirements
•
All conductors that are at risk to physical damage must be protected by conduit, 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.
•
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.
•
Use only copper wires with a minimum temperature rating of 194°F (90°C).
2.1.8 Wire Routing
Before connecting any wires, determine all wire routes throughout the home to and from the
inverter. Typical routing scenarios are:
•
AC input wiring from the main AC panel to the inverter
•
AC input wiring from a generator (optional) to the inverter
•
DC input wiring from the batteries to the inverter
•
AC output wiring from the inverter to an AC sub-panel or to dedicated circuits
•
Battery Temperature Sensor cable from the inverter to the batteries
•
Remote control cable (optional) to the inverter
•
Ground wiring from the inverter to an external ground
2.1.9 Torque Requirements
Torque all AC wiring connections to 16 in lbf (1.8 Nm) and AC/DC ground connections to 45 in lbf
(5.1 Nm). Torque DC cable connections from 10 to 12 ft lbf (13.6 to 16.3 Nm).
© 2017 Sensata Technologies
Installation
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