Rockwell Automation 1512A MV Controllers, 400A One-High Cabinet, Standard and Arc-Resistant Enclosure - Manual (Page 84)

76 Rockwell Automation Publication 1512A-UM100F-EN-P - May 2013
Appendix B ArcShield Plenum Installation Instructions
Cabinet Preparation
In preparation for mounting Plenum, remove 1/4-20 fasteners from the Relief
vent on the top of the MV enclosure. .
The Plenums are designed to fit over the fastener heads at the four corners of the
Relief vent. The corner fasteners are required to secure the Relief vent during
installation.
Plenum Placement on Structure
Once the Plenum has been lifted in place directly over the relief vent (shown in
Figure 75 ), all 1/4-20 fasteners, removed in Cabinet Preparation above, are
replaced to attach the Plenum to the top of the enclosure. Use hand tools only.
IMPORTANT Do not remove the four corner fasteners ( Figure 74 )
Figure 73 - Typical Relief Vent Fasteners (top view) Figure 74 - Relief Vent
Relief vent
Relief fasteners
Corner fasteners