Magnum Energy ME-G Series - Manual (Page 19)

©
2015 Sensata Technologies Page 10
Installation
2.3 Wiring the Inverter – General Requirements
This section describes the requirements and recommendations for wiring the ME-G Series inverter/
charger. Before wiring the ME-G 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 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, etc.) which make the wiring more hazardous and challenging. The input/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) 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. Use
jacketed wires. Sensata offers DC conduit boxes (ME-CB or MPX-CB) that include the necessary
AC and DC inverter breakers.
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, 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 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.
• 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 90°C (194°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 an onboard generator (optional) to the inverter
• DC input wiring from the batteries to the inverter
• AC output wiring from the inverter to the coach’s AC main 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).