Installation manual
27
Safety, Installation, and Operations Manual
© Solaria Corporation All rights reserved. Contents subject to change without notice 8-26-19
Power Unlocked by Design
Step 10: Grounding
y Before installing the solar system, contact local authorities to determine the necessary system hardware
grounding requirements.
y The AC cable has no neutral conductor. For neutral grounding, refer to the diagram in section 9.0.
y Module frames should be electrically connected to an earth ground for safety and protection from lightning in
accordance to the National Electric Code (NEC).
y Solaria PowerXT
®
solar modules may be installed on a mounting system certied to UL 2703 with approval of
the mounting system manufacturer.
y When using a mounting system, grounding of modules must be accomplished by the method prescribed by the
mounting system manufacturer.
y Where common grounding hardware (nuts, bolts, star washers, split-ring lock washers, at washers and the
like) are used to attach the solar module to a listed grounding/bonding device, the attachment must be made in
conformance with the grounding device manufacturer’s instructions.
Common hardware items such as nuts, bolts, star washers, lock washers, and the like have not been
evaluated for electrical conductivity or for use as grounding devices and should be used only for
maintaining mechanical connections and holding electrical grounding devices in the proper position
for electrical conductivity. Such devices, where supplied with the module and evaluated through the
requirements in UL1703, may be used for grounding connections in accordance with the instructions
provided with the module.
y Follow these instructions to ground the module.
The module frame has four 4.5 mm grounding holes (‘A’) that are shown on the module drawing. Ground
marks are located next to the grounding holes. Attach a 10 AWG (2.588 mm diameter) bare copper ground
conductor to a grounding lay-in lug mounted at one of the four grounding holes on the module frame. Use a
grounding lug with tin plating and stainless-steel hardware (#10-32 hex head screw at 4 mm diameter, at
washers, tooth lock washer and nut).
A #10 at washer must be used between the screw head and the grounding lug to prevent damage to the
tin plating on the lug. Insert a #10 at washer between the grounding lug and the module frame. A #10
tooth lock washer must be inserted between the nut and the module frame to break the anodized layer of
the frame. This mechanical bond between the tooth lock washer and the frame of the module will ensure a
good electrical bonding path.
The #10-32 assembly attachment screw must be tightened between 20-25
inch-pound. A 10 AWG bare copper ground conductor must be attached
to the ground lug using the stainless-steel set screw provided by the lug
manufacturer. Tighten the set screw between 10-15 inch-pound to ensure a
strong mechanical and electrical bond.
Grounding Hole A
#10-32 Hex Headed Screw SS
#10-32 Hex Nut SS
#10 Tooth Lock Washer SS
#10 Flat Washer SS
Recommended stainless steel
hardware and assembly
63.8 in ± .2
43.9 in ± .2
5.8 in1.0 in
1.0 in
14.2
35.4 in
5.8 in
POSITIVE (+)
31.5
0.2 in
NEGATIVE (-)
29.5
0.2 in
0.276 in x 0.349 in
4X MOUNTING SLOTS 'B'
0.18 in THRU ALL
4X GROUND 'A'
1.38 in
1.57 in
.39 in
.07 in
AB BA