JOHNSON CONTROLS
14
Form 160.00-N6
Issue date: 08/27/2021
Section 2 - Equipment grounding
• After setting the drive cabinets in place,
the periphery of the cabinets must be spot
welded to the steel channels approximately
every 18 in. This creates a very good high
frequency ground plane. Make sure that elec-
tronic component damage is avoided during
the welding process. Keep the welded return
path as close as possible to the work position.
The return path must always be within 3 ft of
the electrode.
• If leveling beams are not installed, a number
of grounding cables 7C must be run from
the ground lugs provided on the cabinets to
the nearest grounded column or floor beam,
or wire floor mesh, or similar structure.
This provides the necessary high frequency
ground plane.
