QRail Installation

BI 7.2.3-46
Jul-2019, Rev 4.2
9
As shown in Image 2.4.4 and 2.4.5, the QRail Clamps with QClick
Technology and rails are designed with complementary, sharp hooks.
When the clamp is installed in the rail and the bolt is tightened, the bolt
forces the hooks into the rail. Then, as the clamp engages the module
and the bolt is tightened to the recommended torque specification
[12  -lbf (16 N-m)], these hooks are pulled into the QClick channel
and penetrate the aluminum oxide or painted coating on the rail and
electrically bond to the rail, clamp, and bolt. A star washer under the bolt
head serves to electrically bond the bolt to the body of the mid or end
clamp, thus forming a secure electrical bonding path as shown in Image
2.4.6.
Bonding with QClick Technology®
PV module frames are electrically bonded to the QRail system by the bonding mid clamps.
Bonding plate mid clamps are preassembled with a stainless steel plate below the clamp head.
The stainless steel bonding plate is formed with spikes that pierce the oxide of the clamp head
and the PV module, forming an electrical bond between the module, the clamp head, and thus
to the rest of the QRail system. Bonding mid clamps are available in either mill or black finish.
Universal height end clamps are available with optional bonding
clips (WEEB-BMC-1
1
). Bonding versions of the end clamps
are useful when mounting a single module or in shared rail
configuration where bonding mid clamps are not utilized. The
WEEB-BMC-1 works in the same way as the bonding plate.
PV Module Bonding
NOTE!
The installer is responsible for and shall provide an appropriate
method of direct-to-earth grounding according to the latest
edition of the National Electrical Code, including NEC 250:
Grounding and Bonding and NEC 690: Solar Photovoltaic
Systems.
The QRail Hidden End Clamp is NOT a bonding solution and
therefore cannot be used on single modules. It must always be
installed in conjunction with at least one Bonding Mid Clamp.
Image 2.4.4
Clamp hooks
Image 2.4.5
Clamp hooks and rail
Image 2.4.6
Clamp bonding path
Image 2.4.7
Bonding plate mid clamp
Image 2.4.8
Fixed end clamp
Image 2.4.9
Universal end clamp
Image 2.4.10-1
Universal end clamp
w/WEEB-BMC
hooks
1
WEEB-BMC -1 is evaluated as an alternative component and maybe used interchangeably with a WEEB-BMC Bonding Clip.