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©
2009 Magnum Energy Inc
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Installation
2.7 Inverter
Notifi cation Requirements
When an inverter is installed in a building, facility or structure, the NEC (National Electrical Code)
requires a label or plaque to be provided. This label/plaque is required to be easily visible and
provide information that informs personnel on the location of all electrical system disconnects.
This is to ensure all power to a building is quickly located and shutdown in an emergency. There
are also speci
fi
c requirements for this label/plaque depending on the inverter application, they
are as follows.
2.7.1
Facilities with Stand-alone Systems
Any building, facility, or structure with a photovoltaic power system that is not connected to a
utility service source and is a standalone system must have a permanent plaque or directory
installed on the exterior of the building or structure at a readily visible location acceptable to the
Authority Having Jurisdiction (AHJ). The plaque or directory must provide the location of system
disconnecting means and information regarding whether the structure contains a standalone
electrical power system.
2.7.2
Facilities with Utility Services and PV Systems
Buildings, facilities, or structures with both utility service and a photovoltaic system must have a
permanent plaque or directory providing the location of the service disconnecting means and the
photovoltaic system disconnecting means if they are not located at the same location.
2.7.3
Inverter Warning Label
A warning label as shown in
fi
gure 2-24 is provided to inform all personnel that an inverter is
installed in your electrical system. Af
fi
x this label in a clearly visible location at the electrical panel
that is being powered by the inverter. This is because it might be falsely assumed that the panel
is no longer “hot” after the AC power has been shut off, when power may actually still be available
due to the inverter automatically powering the panel.
Figure 2-24, Warning Label
2.8 Final
Inspection
Verify all cables/conduit runs are secured with wire ties or other non conductive fasteners to
prevent cha
fi
ng or damage from movement and vibration.
Verify strain reliefs or grommets are in place to prevent damage to the wiring or conduit where
it passes through walls, bulkheads or other openings.
Verify all AC connections are correct and torqued to a maximum of 16 in lbf (1.8 N-m).
Replace the covers on the main electrical/distribution panel.
Replace the chassis access cover.
Verify the inverter’s front panel switch is in the “OFF” position.
Info
: If required by code, have the installation inspected by an electrical inspector.
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