Industrial Automation Wiring and Grounding Guidelines
E115P
6
Equipment-
grounding
Conductors
Ground
Lug
Bolt
Star
Washer
Ground Bus
Mounting
Ground Bus
Tapped Hole
Grounding-electrode
conductor to
grounding-electrode
system.
Make good electrical connection between each chassis,
back-panel, and enclosure through each mounting bolt or
stud. Wherever contact is made, remove paint or other
non-conductive finish from around studs or tapped holes.
Bonding and Grounding the Chassis
With solid-state controls, proper bonding and grounding
helps reduce the effects of EMI and ground noise. Also,
since bonding and grounding are important for safety in
electrical installations, local codes and ordinances dictate
which bonding and grounding methods are permissible.
For example, for U.S. installations, the National Electrical
Code (NEC) gives you the requirements for safe bonding
and grounding, such as information about the size and
types of conductors and methods of safely grounding
electrical components.
Equipment-Grounding Conductor —
In addition to
making good connections through each bolt or stud, use
either 1-inch copper braid or 8 AWG minimum stranded
copper wire to connect each chassis, enclosure and central
ground bus mounted on the back-panel. Figure 3 shows
ground-bus connection details.
Figure 3 – Ground Bus Connection Details
Figure 4 shows enclosure-wall ground connection details.
Use a steel enclosure to guard against EMI. If the
enclosure door has a viewing window, it should be a
laminated screen or a conductive optical substrate to block
EMI. Do not rely on the hinge for electrical contact between
the door and the enclosure; install a bonding wire.
Figure 4 – Details of Ground Connection at
Enclosure Wall
Connect an equipment grounding conductor directly from
each chassis to an individual bolt on the ground bus. For a
chassis with no ground stud, use a mounting bolt (Figure 5).
For those chassis with a ground stud, use the ground stud
for this connection (Figure 6).
For a power supply without a groundable power supply
chassis (such as a power-supply module or mini-processor
with an integral power supply), or a power supply with a
chassis that is not internally connected to its GND terminal,
use a 14 AWG copper wire to connect its GND terminal
to the ground stud or mounting bolt connected to the
ground bus. This will ensure an adequate ground for
noise immunity.
Figure 5 – Details of Ground Connection at Mounting
Bracket of Chassis with No Ground Stud
Enclosure
Wall
Scrape
Paint
Bolt
Scrape paint on enclosure
wall and use a star washer.
Ground
Lug
Nut
Star
Washer
Equipment-
Grounding
Conductor
If the mounting bracket
is coated with a
non-conductive material
(anodized, painted, etc.),
scrape the material
around the mounting hole.
Mounting Bracket
Nut
Back Panel
Welded
Stud
Scrape
Paint
Flat
Washer
Flat
Washer
Star
Washer
Ground
Lug
Содержание H Series
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