QRail Installation

BI 7.2.3-46

Jul-2019, Rev 4.2

BI 7.2.3-46

Jul-2019, Rev 4.2

The QRail system is listed to UL 2703 with the Burndy/Wiley WEEB-Lug 8.0 as the means

to connect the QRail array to the system ground electrode. 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 a er the roof attachments and rails are in place prior

to module installation. The Burndy WEEB-Lug 8.0 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. The WEEB-Lug 8.0 is

shown in Image 2.5.2:

a Lug

b WEEB 8.0

c Wire capture bolt

d M8x20 T-head bolt

e 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 WEEB-Lugs 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 2.5.3.

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

by the WEEB-Lug 8.0, are shown in Table 2.5.1 on the next page.

2.5 System Electrical Grounding

Array Grounding Lug

Image 2.5.1

WEEB Lug 8.0

Image 2.5.2

WEEB Lug 8.0 components

Image 2.5.3

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 WEEB-Lugs or bonding jumpers are not required for

spliced rails.

When using aWEEB-Lug 8.2 see our Supplemental for info on