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Bundang First Tower, 55, Bundang-ro,
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Chungcheongbuk-do 369-872, Korea
5.4 Earth Ground Wiring
To prevent electric shock and fire, an earthing must be done on the frames of PV modules and array.
The array frame must be earthed according to NEC Article 250 (USA) or CEC (Canada).
1) Grounding hardware
There is an earthing hole in the module frame; by using these holes, an earth conductor and the
module frame must be connected and earthed. (See picture 6)
Common grounding hardware (nuts, bolts, star washers, spilt-ring lock washer, flat washers and the
like) is used to attach a listed grounding/bonding device. The attachment must be made in
conformance with the grounding device manufacturer's instructions.
Common hardware items such as nuts, bolts, star washers, lock washers and the like have not been
evaluated for electrical conductivity or for use as grounding devices and should be used only for
maintaining mechanical connections and holding electrical grounding devices in the proper position for
electrical conductivity. Such device, where supplied with the module and evaluated through the
requirements in UL 1703, may be used for grounding connections in accordance with the instructions
provided with the module.
Picture 6. Grounding Hardware(Torque level: 4~5N
·
m)
2) Grounding using Lay-in Lug
It is necessary to ground module at earth hole (4.2mm / all frame) using GBL-4DBT Lay-in lug of
ILSCO or a product certified of quality above. In order to connect module frame and Lay-in-lug electric
more effectively, installers should use external saw tooth type washer or saw tooth type Lug and torque
wrench.
The material for bolt, nut, washer and lug should be stainless steel.
Picture 7. Lay in Ground Lug(Torque level: 1.5N
·
m)
Nut, SUS304, M4(#8)
External Saw Tooth type washer
Lay-in Lug
Flat washer
Spring washer
Bolt, SUS304, M4(#8)
Grounding Cable
Copper wire 10~14AWG
Module Frame