Magnum Energy Magnum Panel (MP Series) - Manual (Page 67)

Page 60 © 2011 Magnum Energy, Inc.
3.0 Installation
Conductors and General Wiring Methods
❐ Conductors are rated for the application and the environment.
❐ Standard building-wire conductors and appropriate wiring methods are used.
Note: Welding, marine, locomotive (DLO), and auto battery cables don’t meet NEC/CEC
requirements. Flexible RHW or THW cables are available, but these cables require very limited,
specially listed terminals. When the battery conductors leave the battery enclosure, the conductors
must be of a type listed for use in conduit (RHW or THW).
❐ The DC and AC color codes for the ground conductors are the same – grounded conductors are
white and equipment-grounding conductors are green, green/yellow, or bare (no insulation).
❐ All wiring insulation have a minimum rating of 150V, 75°C when using only 120V AC power/
inverter; or, with a minimum rating of 300V, 75°C when using 120/240V AC power/inverter.
❐ Strain reliefs/cable clamps or conduit are used on all cables and cords.
❐ Conductors between the inverter and battery bank are installed in conduit.
❐ No multi-wire branch circuits when single, 120V AC inverters are connected to 120/240V AC
load centers.
Note: A multi-wire branch circuit is a three-wire circuit with a shared neutral for two, 120V AC
branch circuits.
Overcurrent Protection
❐ Properly sized and rated disconnects and overcurrent devices are used in the ungrounded
conductors in each circuit (AC and DC).
❐ Overcurrent devices in the DC circuits are listed for DC operation.
❐ DC overcurrent protection is provided at the batteries when they are located in a separate room,
or more than fi ve feet away from the MP enclosure.
❐ The DC overcurrent protection device and battery cables to the inverter are sized for the inverter’s
DC input current.
Note: Inverter’s DC input current is calculated using rated AC output in watts, divided by lowest
battery voltage, divided by inverter effi ciency at that power level.
❐ When the inverter DC disconnect breaker inside the MP enclosure is not used as the DC overcurrent
device, high interrupt, listed, DC-rated fuses or circuit breakers must be used in the battery cable
circuits.
Batteries
❐ Battery terminals and other live parts are guarded, and adequate working space around the
battery bank is provided.
❐ Batteries are installed in well-vented areas (garages, outbuildings), and not in living areas.
❐ Adhere to the “IMPORTANT BATTERY SAFETY INSTRUCTIONS” at the beginning of this manual.
Marking
❐ Battery bank is labeled with maximum operating voltage, equalization voltage, and polarity.
❐ Utility Back-up Systems: Exterior visible sign indicating the building contains an inverter back-
up system and identifi es the locations of the disconnects.
❐ An electrical system supplied by a 120V AC only inverter includes a label warning against
connecting multi-wire branch circuits.
❐ All required “Warning” and “Caution” signs/labels are installed in the proper locations, as required
in the NEC/CEC.
Inspection
❐ Electrical inspection complete and a Certifi cate of Electrical Inspection has been issued by the
local Authority Having Jurisdiction (AHJ). The local AHJ or inspector has the fi nal say on what is
or is not acceptable. Local codes may modify the requirements of the NEC/CEC.
Part of this checklist is obtained from the Photovoltaic Electrical Power Systems Inspector/Installer Checklist
created by John Wiles, Southwest Technology Development Institute, New Mexico State University, June 2006.