Wiring The Inverter - General Requirements - Sensata Magnum-Dimensions MagnaSine MS-G Series Owner's Manual

Installation
2.3 Wiring the Inverter – General Requirements
This section describes the requirements and recommendations for wiring the MS-G Series inverter/
charger. Before wiring the MS-G Series inverter/charger, carefully read all instructions.
Wiring should meet all local codes and industry 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 safe wiring standards. The NEC/CEC lists
requirements for wire sizes, overcurrent protection, and installation methods/standards.
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/CEC and local codes.
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 proceeding—to prevent accidental shock.
2.3.1 Protecting Wire – Conduit Box
The AC and DC wires to and from the inverter must be protected as required by code. This can be
done by using jacketed wires or by feeding the wires through conduit. Sensata offers a DC conduit
box (ME-CB or MPX-CB) and a single inverter enclosure (MMP Series) that include the necessary AC
and DC inverter breakers that allow both the AC and DC conduit to be connected to the inverter.
Info: The strain reliefs can be removed and replaced with 3/4" grommets if you are using
either the ME-CB or MPX-CB conduit box, or the MMP enclosure, and the AC wires are
individual conductors (i.e., not jacketed).
2.3.2 Wiring Requirements
• All conductors that are at risk for 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.
• Do not mix AC and DC wiring in the same conduit or panel unless specifi cally 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.
• Use only copper wires with a minimum temperature rating of 75°C (167°F).
2.3.3 Wire Routing
Before connecting any wires, determine all wire routes to and from the inverter. Conductors passing
through walls, bulkheads, or other structural members must be protected to minimize insulation
damage, such as chafi ng. During installation, always avoid placing conductors near sources of
chafi ng caused by vibration or constant rubbing. 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 to and from the inverter
2.3.4 Torque Requirements
Torque all AC wiring connections to 16 lbf-in (1.8 N-m). Torque DC cable connections from 10 to
12 lbf-ft (13.6 to 16.3 N-m).
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