Planning the Installation
975-0131-01-01 2–5
PV Array Requirements

General Recommendations

It is important that the PV array is installed correctly to the manufacturer’s
specifications and to local code requirements.
For general recommendations on PV array installation, the CEC Guide to
Photovoltaic System Design and Installation document referenced in “Related
Information” on page v is recommended. It is available at www.energy.ca.gov.

Equipment and Installation Recommendations

The following PV array equipment and installation recommendations are taken
from the CEC Guide to Photovoltaic System Design and Installation document
referred to above.
Equipment
recommendations • All electrical equipment should be listed for the voltage and current ratings
necessary for the application.
•All wiring should be sized correctly to minimize voltage drop.
•All exposed wires or conduits should be sunlight resistant.
•All required overcurrent protections should be included in the system and
accessible for maintenance.
•Depending on the installation, an external disconnect may be required if the
inverter is installed in a location not easily accessible to utility or fire
personnel. Consult local authorities for additional information.
•Integral roofing products should be properly rated.
Installation
recommendations •All electrical terminations should be fully tightened, secured, and strain
relieved as appropriate.
•All mounting equipment should be installed according to the manufacturer’s
specifications.
•All roof penetrations should be sealed with an acceptable sealing method that
does not adversely impact the roof warranty.
•All wires, conduit, exposed conductors and electrical box es should be secured
and supported according to code requirements.
WARNING: Shock hazard
Whenever a PV array is exposed to sunlight, a shock hazard exists at the output wires or
exposed terminals. To reduce the risk of shock during installation, cover t he a rray with an
opaque (dark) material before making any connections.
Important:
The PV array should be free of shade between 9:00AM and 4:00 PM. This
requirement includes even small obstructions such as vent pipes, chimneys and power
lines. A small amount of shade can have a disproportionately high im pact on system
performance.