2020 Installation Guide

BI 7.2.3-46
Feb-2021, Rev 14
BI 7.2.3-46
Feb-2021, Rev 14
10
The QRail is attached to the roof by roof attachments.
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 2.4.12-1 and 2.4.12-
2). When secured to the rail [192 in-lbs (22 N-m)], 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 roof attachment and forms an
Roof Attachment Bonding
The MLPE is attached to the QRail with the same stainless steel T-Bolt and stainless steel
serrated flange nut used for the roof attachment. (Image 2.4.11-1). When secured to the rail
[192 in-lbs (22 N-m)], 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 2.4.12-1
T-bolt
Image 2.4.13
T-bolt in QRail
Image 2.4.12-2
L-foot / Rail / T-bolt
Image 2.4.14
T-bolt in QRail with MLPE
installed
Image 2.4.15
MLPE mounted to QRail with
T-bolt.
Full engagement of T-bolt is confirmed when the alignment
indicator line on the end of the T-bolt is vertical.
INCORRECT CORRECT
WARNING
CAUTION
Use only 20mm long T-bolts when
mounting Module Level Power
Electronics (MLPE) to top of rail. Place
MLPE in a location on the rail that
reduces the risk of contact with the
module backsheet under load.
NOTE!
Roof attachments and accessories are outside the scope of UL-
2703 on grid interactive PV systems. QRail is attached to the roof
utilizing compatible roof attachments. See our website at www.
quickmountpv.com for applicable roof attachments.