Rockwell Automation 1512A MV Controllers, 400A One-High Cabinet, Standard and Arc-Resistant Enclosure - Manual (Page 93)

Rockwell Automation Publication 1512A-UM100F-EN-P - May 2013 85
ArcShield Chimney Installation Instructions Appendix C
Cabinet Preparation
In preparation for mounting a chimney, remove 1/4-20 fasteners from the Relief
vent on the top of the MV enclosure. Leave the four corner fasteners in place (see
Figure 87 ).
The chimneys are designed to fit over the fastener heads at the (4) corners of the
Relief vent. The corner fasteners are required to secure the Relief vent during
installation.
Figure 86 - Relief Vent Fasteners (top view) Figure 87 - Relief Vent
Relief vent
Relief fasteners
Corner fasteners