9910048 RevC
February 2020
Appendix D: Electrical Grounding
(ANSI/UL 2703 Not Applicable) (Contd.)
PAGE
22
Typical Module Ground Connection Detail
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 grid, 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.
Follow PV Module manufacturer instructions to establish an
approved ground connection between the module and an
appropriately sized bonding jumper. The bonding Jumper can then
be connected to a UL 467 listed Tyco Solarlok grounding assembly,
part number
2106831-1
, manufactured by Tyco Electronics
Corporation, which may be installed on a Rail to establish the
ground connection to the
“grid”
.
ALERT:
Every sub-array must include
at least one grounding device/lug.
