Electrical Grounding
Grounding Overview
The clawFRplus 10 Degree flat roof system can be used to ground
and/or mount a PV module complying with ANSI/UL 1703 or
ANSI/UL 61730 only when the specific module has
been evaluated for grounding and/or mounting in compliance
with the included instructions.
PanelClaw components within the array are required to
be electrically bonded to the Fault Current Ground Path via the
use of appropriately sized Cu wire and a UL 467 listed Tyco
Solarlok grounding assembly, part number
2106831-1
. The
conductor size should be selected in accordance with NEC 690.45
and NEC 250.122.1.
Please consult with national and local building code(s)
for complete grounding requirements for your installation.
A list of approved modules can be found in the
PanelClaw
“clawFR/clawFRplus
UL 2703 List of Ratings and
Compatible Modules and
MLPEs”
. The most recent version can
be found on the PanelClaw website (
).
ALERT:
During grounding and bonding ensure there is separation
between bare copper and aluminum or coated steel
components.
ALERT:
Every sub-array must include at least one
grounding device/lug.
Fault Current
Ground Path
Ground Lug
Tyco #2106831-1
Row
Column
System Ground Path
The path to ground is established throughout the array by electrically bonding the
PV module through the module frame connections on the Module Connector Tilt
Arms and Cam Connections. The Module Connectors are bonded to the Rail where
the Tyco Grounding lug is installed, as shown below. All other accessible metallic parts
are also electrically bonded to the Fault Current Ground Path.
Tyco Grounding lug attachment:
To attach the Tyco grounding device/lug to the Rail, the mounting hex washer and
threaded post end should be installed to the specified hole in the Rail and torqued to
2.08 ft-lb (25 in-lb)
.
Once the grounding device/lug has been attached to the Rail, a
copper grounding wire must be installed to the wire slot end and torqued to
3.75 ft-lb
(45 in-lb)
.
R
efer to the Tyco Electronics instructions sheet (document number 408-
10262) via their website www.te.com for additional instructions.
Note:
During maintenance and servicing where module removal is required, adjacent
modules maintain the bond path to the Ground Lug and therefore module jumpers are
not required to be installed.
Rail