Magnum Energy Mini Magnum Panel (MMP Series) - Manual (Page 23)

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2013 Magnum Energy, Inc. Page 14
Installation
2.5 Wiring the MMP Enclosure – General Requirements
This section describes the requirements and recommendations for wiring to the MMP enclosure.
Read all instructions before wiring the MMP enclosure. All wiring should meet local codes and
standards and be performed by qualifi ed personnel such as a licensed electrician.
Refer to the NEC (National Electric Code, ANSI/NFPA 70) for the United States and the CEC
(Canadian Electrical Code) for Canada which provide the standards for safely wiring residential
and commercial installations.
WARNING: The AC neutral and DC negative are bonded to ground in this enclosure.
If the AC or DC circuits are already bonded to ground elsewhere in your system, you
must remove the DC and/or AC bonding inside this enclosure. Refer to Section 2.11
and 2.12 to remove the AC and/or DC ground bond connection.
WARNING: The AC neutral must be connected to safety ground (often called a “bond”)
in one, and only one, place at a time. More than one neutral to ground bond can cause
“ground loop” currents, which can trip GFCIs, cause an electrical shock hazard, and
may be the reason for other annoying side effects. In attempting to install the MMP in
a mobile application (i.e., RV, truck, or boat), refer to Appendix B for more information.
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.
2.5.1 Disconnect Switch and Overcurrent Protection
For residential and commercial electrical systems, the NEC/CEC requires a disconnect switch and
overcurrent protection for all ungrounded conductors on the AC side as well as the DC side. The
MMP enclosure provides both AC and DC circuit breakers that are used as the disconnect switch.
These circuit breakers can also be used as the overcurrent protection device when the ampacity
of the wire and its insulating material, voltage, and temperature rating are correctly sized to the
DC circuit breakers in your MMP enclosure. Refer to the appropriate installation section (AC Wiring
or DC Wiring) to determine the minimum recommended wire size required.
2.5.2 General Wiring Requirements
• The AC and DC wires into and out of the MMP enclosure must be protected as required by code.
This can be done by using jacketed wires or by feeding the wires through conduit.
Info: If the strain reliefs on the Magnum inverter are not required, they can be removed
and replaced with 3/4” grommets.
• Use proper clamps or other approved methods for securing the cable/conduit to the enclosure.
• Do not mix AC and DC wiring in the same conduit. The MMP enclosure is specifi cally approved/
designed for both AC and DC wiring. However, where DC wiring must cross AC or vice-versa,
try to make the wires at the crossing point 90° to one another.
• Use only copper wires with a minimum rating of 150V, 75°C if only 120 VAC power is being
used; or, with a minimum rating of 300V, 75°C if 120/240 VAC power is being used.
• In a system where one conductor is grounded the wire colors on the DC side and AC side are the
same. The insulation on all grounded conductors (DC negative/AC neutral) must be white, gray,
or any color except green if marked with white at each termination (marking only allowed on 6
AWG or larger conductors). The equipment grounding conductors must be bare (no insulation),
or have green or green with yellow-striped insulation or identifi cation. The hot ungrounded
conductor (DC positive/AC hot) is usually red or black.
• Terminals containing more than one conductor must be listed for multiple conductors.
• The connectors or terminals used on fl exible, fi ne-stranded conductors must be specifi cally
marked or labeled for use with fi ne-stranded conductors.
• The MMP enclosure includes wires (along with communication cables) with insulation rated for
at least 300 volts, which allows 120/240 VAC inverters to be installed. If installing a 120/240
VAC inverter, the installer must also provide wires (both power and communication) with the
insulation rated for at least 300 volts.