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3-9 Grounding
Check your information below before grounding.
• Grounding is largely classified into equipment grounding and neutral grounding. The purpose of the equipment
grounding is to prevent electric shock from contact with metal parts. Equipment grounding allows the abnormal current
to flow from the equipment to the earth.
• The equipment grounding conductor and the neutral conductor are separated. Depending on the local code,
connection between the equipment grounding conductor and the neutral conductor may be required in the distribution
panel.
• The neutral conductor of LG AC module is built into the AC cables. (For neutral grounding, refer to
Chapter
3-10.
Connecting AC Module Array-to-Distribution Panel)
• In a place with frequent lightning storms, by installer, an auxiliary grounding may be connected directly from the AC
module system to the ground.
• To form an effective equipment grounding path, do not make any unnecessary paths.
• Practice according to the local electricity code.
• A module with exposed conductive parts is considered to be in compliance with UL 1703 only when is electrically
grounded in accordance with the instructions presented below and the requirements of the National Electrical Code.
NOTICE
Form the equipment grounding path from AC module to the grounded distribution panel with one
connection in the following order:
Step 1. To form the effective grounding path, connect the one of points marked of a PV frame, point, to the
PV rack. To electrically connect, it recommends that you use one M4 stainless steel bolt, one nut, one
spring washer, two flat washers, one cup washer and, one star washer. (Minimum torque : 4~5 Nm)
Step 2. Connect an equipment grounding conductor from AC module arrays to AC junction box, to form one
equipment grounding system. (For grounding method, refer to next page’s Samples for Grounding)
※ The installation instructions shall include:
1. Wiring must be compliant with NEC Article 705.
2. Grounding methods must be compliant with NEC Article 250.
3. CNL model instruction manuals shall also include a statement that installation shall be inaccordance with CSA
C22.1, Safety Standard for Electrical Installations, Canadian Electrical Code, Part1.
Module frame
Bolt
Flat washer
Cup washer
Star washer
Grounding wire
Flat washer
Spring washer
Nut
Electric connection of the PV rack and PV module
WARNING
• Do not use bare-copper grounding lugs for grounding. The lugs can corrode which could result in a
faulty ground circuit thereby, posing risk for electric shock, electrocution or fire hazard.