QRail Installation

BI 7.2.3-46
Jul-2019, Rev 4.2
11
The QRail is attached to the roof by roof attachments with L-feet.
The connection from the attachment device to the rail is made via a stainless steel T-bolt and
a stainless steel, serrated flange nut (Image 2.4.11-2).
Roof Attachment Bonding
The QRail is attached to a MLPE with the same stainless steel T-Bolt and stainless steel
serrated flange nut used for the roof attachment. (Image 2.4.11-2). When secured to the rail
[16  -lbf (22 N-m)]
1
, the T-bolt crushes and pierces the aluminum oxide or paint and forms
an electrical bond with the rail. The serrated flange nut pierces the coating on the MLPE
bracket and forms an electrical bond that is carried through the T-Bolt to the rail.
Module Level Power Electronic (MLPE) or Accessory Bonding
Image 2.4.11-2
T-bolt
Image 2.4.12
T-bolt in QRail
Image 2.4.13
T-bolt in QRail with MLPE
installed
Bonding plate
Full engagement of T-bolt is confirmed when the alignment
indicator line on the end of the T-bolt is vertical.
INCORRECT CORRECT
WARNING
1
If using non-nylon patched t-bolts tighten to 15  -lbf (22 N-m)
CAUTION
Use only 20mm long T-bolts when
mounting Module Level Power
Electronics (MLPE) to top of rail.
25mm long T-bolts increase the risk
of contact with the back sheet.