9
4.2 Grounding
Grounding the aluminum frame with copper wire
4.2.1
Use the marked 5.5 mm grounding holes (5.5mm) to ground the anodized frame. Use an M5 nut, two M5 cut washers,
an M5 plain washer, an M5 spring washer, and an M5 bolt and a copper wire. All nuts, bolts, and washers are type M5
and should be made of stainless steel (Fig. (k)).
4.2.2
Put 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.)
4.2.3
Put the bolt through the cut washer and then through the hole in the aluminum frame.
4.2.4
Add the spring washer and nut on the other side of the bolt and tighten to secure all parts. The tightening torque
should be 210±20 N•cm.
4.2.5
Approve the use of UL-467 approved 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 as suitable for electrical bonding and grounding PV modules to PV mounting systems.
5. Maintenance
5.1
Regularly carry out a visual inspection for dirt, dust, bird dropping, leaves, and other detritus covering the modules.
5.2
If there is a build-up of dirt or dust on the module surface, wash the module with clean water and a gentle implement
(a sponge). Never use chemicals on the surface of the module.
5.3
If snow is present, a soft-bristled brush with soft bristles may be used to clean the surface of the modules.
5.4
Regular electrical and mechanical inspection by a licensed professional will keep the system safe and operating at
maximum efficiency.
(k)
Stainless steel M5 bolt
Stainless steel M5 nut
Stainless steel spring washer
Stainless steel cut washer
Stainless steel plain washer
Copper wire
Stainless steel M5 cup washer
Stainless steel M5 bolt
