Rockwell Automation Publication 1512A-UM101B-EN-P - December 2021
79
Appendix
B
ArcShield Plenum Installation Instructions
These instructions are provided to ensure the proper installation and function
of plenum components supplied with ArcShield enclosures. See
for additional information related to ArcShield plenums before attempting to
follow these instructions.
Recommended Torque
Values
1/4-20 Thread Fasteners – 15 N•m (12 lb•ft)
5/16-18 Thread Fasteners – 14.5 N•m (11 lb•ft)
Plenum Bracing
Bracing of the plenum must be able to withstand the dynamic forces of the arc
fault and any other vibration or seismic effects that are associated with the
installation. Most of this force will be in the direction opposite to where the
relief vent exits. The amount of bracing will depend on how the plenum is
supported at its exit and the distance from the end of the cabinets to the exit
vent.
•
A flange is available for installing hangers to support the plenum weight.
•
The plenum extension has holes for mechanical support.
•
Weight per unit length of Rockwell Automation supplied plenum = 28 kg/
m (19 lb/ft).
•
The installer is responsible for ensuring that the plenum extension has
sufficient support to resist the effect of vibrations and seismic effects.
IMPORTANT
Plan the location where the plenum will exhaust (refer to
). Equipment in the area of the plenum exhaust will be
damaged or destroyed. Mark the plenum exhaust area as a
Hazardous Zone (
). The arc gas plenum system must be
installed per the instructions contained herein. The intent of the
arc gas plenum system is to make an air tight connection
between the motor control section and the plenum and any
external exhaust points. Failure to follow these instructions, and
create air tight seals at all joints, will result in moisture buildup
inside the arc gas plenum and possible equipment damage or
failure.
