2020 Installation Guide
BI 7.2.3-46
Feb-2021, Rev 14
11
The QRail system is listed to UL 2703 with the QMR-GLQ-A-50 Grounding Lug as
the means to connect the QRail array to the Equipment Grounding Conductor
(EGC). It is the system installer’s responsibility to determine the appropriate wire
size for grounding the array.
To ease and facilitate the process of bonding and grounding the array, it is
recommended that these steps are accomplished aer the roof attachments and
rails are in place prior to module installation. The QMR-GLQ-A-50 Grounding Lug
is a special, preassembled lay-in lug designed specifically for use in bonding the
array segments (module rows) electrically and for connecting the bonded array to
ground. QMR-GLQ-A-50 Grounding Lug is shown in Image 2.5.1:
a Lug
b Wire capture bolt
c M8x20 T-head bolt
d M8 serrated flange nut
When the PV modules are properly installed, the QRail QClick bonding clamps ensure that
all the exposed metal parts and the module frames in each module row or array segment
are integrally electrically connected (bonded) with a high-ampacity bond. Each module
row must also be connected to ground through the system ground electrode. This is
accomplished by using QMR-GLQ-A-50 Grounding Lug to bond each of the array segments
or module rows together and for connecting the entire array to the ground electrode. This
arrangement is shown in Image 2.5.2.
It is the installer’s responsibility to determine the correct wire type, size, and temperature
rating for the particular array. The wire sizes and capacities, which can be accommodated
2.5 System Electrical Grounding
Array Grounding Lug
Image 2.5.1
QLug Groundling Lug components
T-bolt:
192 in-lbs (22N-m)
Wire capture bolt:
6-8 AWG: 60in-lbs (7N-m)
10-12 AWG: 36in-lbs (4N-m
Image 2.5.2
Array bonding connections at each
module row
NOTE!
The QRail QSplices have been evaluated and listed to UL 2703;
therefore, a spliced rail can be treated as a single solid rail.
Additional QMR-GLQ-A-50 Grounding Lugs or bonding jumpers
are not required for spliced rails within the thermal break
guidelines.
When using a WEEB-Lug 8.0 see our supplemental instructions
a
c
b
d