Electronics
AC Module System Installation Manual
Copyright © 2020 LG Electronics.
All Rights Reserved.
35
Rev. 1.0
3-11 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.
•
In a place where lightning storms are frequent, an auxiliary grounding may need to be installed by the installer. The path comes
directly from the AC module system and goes to the ground.
•
To form an effective equipment grounding path, do not make any unnecessary paths.
•
Make sure to follow local electric code.
•
A module with exposed conductive parts is considered to be in compliance with UL 1703 only when it is electrically grounded in
accordance with the instructions presented below and the requirements of the National Electrical Code.
Form the equipment grounding path from AC module to the grounded distribution panel with one connection in the
following order:
•
To form the effective grounding path, connect one of points marked of a AC module frame to the PV rack.
•
To electrically connect, it is recommended to 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 N•m)
•
Connect an equipment grounding conductor from AC module arrays to AC junction box, to form one equipment
grounding system. (For grounding method, refer to
Samples for Grounding
on the next page)
The installation instructions shall include:
1. Wiring must be compliant with NEC Article 705.
2. Grounding methods must be compliant with NEC Article 250. Module array must be compliant with NEC Article 250 and the
grounding method uses AC module frame.
3. CNL model installation shall be in accordance with CSA C22.1, Safety Standard for Electrical Installations, Canadian Electrical
Code, Part1.
•
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.
Notice
Electric connection of the PV Rack and PV Module
