Rockwell Automation 1512A MV Controllers, 400A One-High Cabinet, Standard and Arc-Resistant Enclosure - Manual (Page 80)

72 Rockwell Automation Publication 1512A-UM100F-EN-P - May 2013
Appendix A ArcShield Unit Information
Chimney Information
Where adequate clean height (space) is available, chimney can be provided for
each unit in place of the plenum system. It is to be field mounted on top of the
unit structure. The purpose of the chimney is to direct the hazardous flames and
gases away from the top of the resistant enclosure. The chimney is secured to the
top of each unit structure. Refer to
Appendix C for chimney installation
instructions.
Each ArcSheild line-up includes a chimney exhaust section that extends vertically
directly above the enclosure.
Chimney Exhaust Considerations
1. From the outlet of the chimney, there needs to be a minimum distance of
1.7 m (67 in.) from the top of the chimney to the ceiling, and 1 m (39 in.)
on each side.
2. No obstructions (eg. Piping) can be in the path of the exhaust within this
1.7 m (67 in.) height requirement.
Plan the location where the chimney will exhaust. Ensure that:
• There is no access to personnel while equipment is energized.
• Area is free of flammable material or vapours.
• Ensure that adequate space is provided around the chimney exhaust as
outlined in Figure 68 .