19
Use UL-467 certified bonding and grounding
devices, including Burndy (formerly Wiley
Electronics) Washer Electrical Equipment Bonding
(WEEB) and similar devices, such as barbed
washers, that meet the requirements of UL-467 and
is suitable for electrical bonding and grounding of
PV modules.
Other grounding methods may be used when the
racking system is tested following the UL 2703
requirements.
Do not drill any additional grounding hole on the
frame of the modules. The frame rails have
pre-drilled holes marked with a grounding sign.
These holes should be used for grounding purposes
and should not be used for mounting the modules.
7
Maintenance
PV modules must be inspected and maintained
regularly, especially during the warranty period, which
is the responsibility of the user. This helps to find and
figure out problems in time and ensure the safe and
effective operation of the PV system.
7.1
Routine Inspection
PV modules in PV arrays should be inspected regularly
for damages, such as glass breakage, cable breakage,
junction box damage, cell cracks, and backsheet
breakage and other factors that cause functional and
safety failures of PV modules. If any of the above
problems occurs, the supplier should be notified to
replace the broken module with a new one of the same
type in time.
It is recommended to perform preventive inspection
every 6 months and not to replace the components of
PV modules without authorization. When conducting
inspection or maintenance in term of the electrical and
mechanical performance, it is recommended that
qualified professionals perform the work to avoid
electric shock or personal injury.
Take routine maintenance to keep PV modules free of
snow, bird droppings, seeds, pollen, leaves, branches,
dust, stains, etc.
7.2
PV module cleaning
If the PV module has a sufficient angle of tilt (at least
15°), it is generally not necessary to clean the PV
module (as the rainfall will provide a self-cleaning
effect). If there is a large accumulation of dirt on the
PV module surface that has seriously affected the
power production, the module can be rinsed with water
without detergent, and use a gentle sponge or brush to
clean the surface during the cooler hours of the day.
Dust must not be scraped or wiped off under dry
conditions as this may result in tiny scuff marks. For
snow removal, the PV module surface can be cleaned
with a brush with soft bristles.
Meaning of crossed –out wheeled dustbin:
Do not dispose of electrical appliances as unsorted
municipal waste, use separate collection facilities.
Contact your local government for information
regarding the collection systems available.
If electrical appliances are disposed of in landfills or
