AC Module System Installation Manual
Rev. 1.0
Check your information below before grounding.
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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.
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The equipment grounding conductor and the neutral conductor are separated.
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Depending on the local code, connection between the equipment grounding conductor and the neutral conductor may
be required in the distribution panel.
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In a place where lightning storms are frequent, an auxiliary grounding may need to be installed by installer. The path
comes directly from the AC module system and goes to the ground.
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To form an effective equipment grounding path, do not make any unnecessary paths.
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Practice according to the local electricity code.
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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.
Form the equipment grounding path from AC module to the grounded distribution panel with one connection in the
following order:
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To form the effective grounding path, connect the one of points marked
of a AC module frame to the PV rack.
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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 N•m)
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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. Module array must be compliant with NEC Article 250
and the grounding method uses AC module frame.
3.
CNL model instruction manuals shall also include a statement that installation shall be in accordance with CSA C22.1,
Safety Standard for Electrical Installations, Canadian Electrical Code, Part1.
Notice
3-11 Grounding
Electric connection of the PV Rack and PV Module
34
Copyright © 2017 LG Electronics.
All Rights Reserved.
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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.
