Rockwell Automation 1512A MV Controllers - 800A One-High Cabinet - Manual (Page 83)

Appendix
B
1512A-UM102B-EN-P – June 2013
ArcShield Plenum Installation
Instructions
The following instructions are provided to ensure the proper installation
and function of plenum components supplied with ArcShield enclosures.
Refer to Appendix A for additional information related to ArcShield
plenums before attempting to follow these instructions.
Recommended Torque Values
1/ 4 -20 Thread Fasteners – 6 ft-lb (7.5 N·m)
5 /16 -18 Thread Fasteners – 11 ft-lb (14 N·m)
Plenum Bracing
Bracing of the plenum must be able to withstand the dynamic forces of
the arc fault as well as any other vibration or seismic effects 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 as well as the distance from the end of
the cabinets to the exit vent.
• A flange is available for installing hangers for supporting the weight
of the plenum.
• The plenum extension has holes for mechanical support.
• Weight per unit length of Rockwell supplied plenum =19 lb/ft [28
kg/m].
• Installer is responsible for ensuring that the plenum extension has
sufficient support to resist the effect of vibrations and seismic effects.
Plan the location where the plenum will exhaust
(refer to Appendix A). Be aware that equipment
in the area of the plenum exhaust will be damaged
or destroyed. The plenum exhaust area is to be
marked as a Hazardous Zone, and labeled per
Figure B.1.
I M P O R T A N T I M P O R T A N T