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Insert the bolt through the cup washer and wrap the
copper wire around the bolt. (Note that the copper
wire cannot be attached directly to the aluminum.)
Insert the bolt through the cut washer and then
through the hole in the aluminum frame.
Add the spring washer and nut on the other side of
the bolt and tighten to secure all parts. The
tightening torque should be 4~4.5N•m.
！ATTENTION
Use UL-467 certified bonding and grounding
devices, including Burndy (formerly Wiley
Electronics)
Washer
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
16
Electrical
Equipment
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 (15° or
more), 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.
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