16
M5 bolt and the copper wire. All nuts, bolts, and
washers shall be of type M5 and made of stainless
steel (Fig. 15). Grounding hole location on the panel
frame is shown in Fig. 16 below.
Fig. 16
Grounding hole location on panel frame
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
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.