Polar Bear III HD 5 Degree Installation Manual
9910034 Rev F
21
Grounding Instructions:
PanelClaw components within the array are required to be electrically bonded to other DC grounding
paths via the use of either a #12 or #10 AWG Cu bonding jumpers and a UL 467 listed Tyco solid wire
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.
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
Ballast Tray within each group of strings. PanelClaw’s Polar Bear Ballast Trays
have a hole to which this
grounding device/lug can be attached (see
). In an array that requires multiple bonding
jumpers to satisfy the equipotential requirements, each bonding jumper should be located and installed
on a Support within the group of strings which will be grounded by that jumper.
Note:
Every independent array section must include at least one grounding device/lug.
To attach the Tyco grounding device/lug to the Ballast Tray, the mounting hex washer and threaded post
end should be installed to the specified hole in the ballast tray and torqued to 2.08 ft-lb (25 in-lb). Once
the grounding device/lug has been attached to the ballast tray, 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.
Figure 13 Ground Lug Attachment Location
Or
Product Label located on
the end of every ballast tray
