Owner`s manual

Page 37

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 speciﬁ 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. Afﬁ 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 chaﬁ 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.