Industrial Automation Wiring and Grounding Guidelines
E115P
5
Figure 2 – Mounting Assembly Details
Mounting and Bonding the Chassis
You can mount the chassis with either bolts or welded
studs. Figure 2 shows details for:
• Stud-mounting a ground bus or chassis to the back
panel of the enclosure.
• Stud-mounting a back panel to the enclosure.
• Bolt-mounting a ground bus or chassis to the back
panel of the enclosure.
If the mounting brackets of a chassis do not lay flat before
the nuts are tightened, use additional washers as shims so
that the chassis does not bend when you tighten the nuts.
IMPORTANT
Do not bend the chassis. Bending the chassis might
damage the backplane and result in poor connections.
If the mounting bracket is
coated with a non-conductive
material (anodized, painted, etc.),
scrape the material around the
mounting hole.
Stud Mounting of a Ground Bus or Chassis
to the Back Panel
Nut
Back Panel
Welded Stud
Scrape Paint
Mounting Bracket
or Ground Bus
Flat
Washer
Star
Washer
Flat
Washer
Stud Mounting of the Back Panel to the
Enclosure Back Wall
Back Panel
Nut
If the mounting bracket is coated with
a non-conductive material (anodized,
painted, etc.), scrape the material
around the mounting hole.
Alternative Bolt Mounting of Chassis
to the Back Panel
Mounting Bracket
Star
Washer
Flat
Washer
Back Panel
Scrape Paint
Bolt
Tapped Hole
Use a wire brush to remove
paint from threads to allow a
ground connection.
Scrape paint on panel and
use a star washer.
Welded
Stud
Back Wall of
Enclosure
Flat
Washer
Bolt Mounting of a Ground Bus or Chassis
to the Back Panel
If the mounting bracket is coated
with a non-conductive material
(anodized, painted, etc.), scrape
the material around the
mounting hole.
Bolt
Tapped
Hole
Back Panel
Ground Bus or
Mounting Bracket
Nut
Nut
Scrape paint on panel
and use star washers.
Star
Washer
Flat
Washer
Flat
Washer
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