Rockwell Automation Publication 1560F-UM001A-EN-P - June 2019 257
Appendix E
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 D
for additional information related to ArcShield plenums before
attempting to follow these instructions.
Recommended Torque
Values
• 1/4-20 Thread Fasteners – 7.5 N•m (6 lb•ft)
• 5/16-18 Thread Fasteners – 14 N•m (11 lb•ft)
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 = 28 kg/m (19 lb/ft).
• Installer is responsible for ensuring that the plenum extension has
sufficient support to resist the effect of vibrations and seismic effects.
TIP See publication MV-QS050
for level floor surface requirements.
IMPORTANT Plan the location where the plenum will exhaust (refer to Appendix D
). Be
aware that equipment in the area of the plenum exhaust may be damaged or
destroyed. The plenum exhaust area is to be marked as a Hazardous Zone, and
labeled per Figure 82
.
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