9910045 RevG April 2021
Appendix A: UL 2703 Grounding (Continued)
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 bonding jumper from an
acceptable DC grounded location outside of the array must be installed to the wire slot end and torqued to
3.75 ft-lb (45 in-lb)
. For additional
instruction regarding the installation of the Tyco solid wire grounding assembly, please refer to the Tyco Electronics instructions sheet
(document number 408-10262) via their website www.te.com.
Grounding Instructions:
PanelClaw components within the array are required to be
electrically bonded to other DC grounding paths via the use of
appropriately sized Cu wire and a UL 467 listed Tyco Solarlok
grounding assembly, part number
2106831-1
, manufactured by
Tyco Electronics Corporation. The conductor size should be
selected in accordance with NEC 690.45 and NEC 250.122.1.
To ground the array, first determine the groupings of strings
whose power output wiring is grounded together at an
equipotential grounding conductor location. This could be all
the strings within a physical sub-array, or all the strings grouped
by a single combiner box. Once the groupings of strings at
equipotential have been determined, a Tyco solid wire
grounding assembly must be attached to one Rail within each
group of strings.
PanelClaw’s
clawFR Rails have a hole to which
this grounding device/lug can be attached. In an array that
requires multiple bonding jumpers to satisfy the equipotential
requirements, each bonding jumper should be located and
installed on a Rail within the group of strings which will be
grounded by that jumper.
ALERT:
Every sub-array must include at least one grounding
device/lug.
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ALERT:
If installing clawFR 10 Degree with a module which is not on the UL2703 listing, contact PanelClaw.
