Rockwell Automation Allen-Bradley 7712, User Manual

Page: 13 / 74

Rockwell Automation Publication 7712-UM001D-EN-P - October 2017 13
General Information Chapter 1
ArcShield Components
Installation Requirements
The Bulletin 7712 ArcShield enclosure typically includes a pressure relief vent.
The pressure relief vent opens under arc flash conditions, allowing hazardous
flames and gases to exit the enclosure via plenum.
ATTENTION:
The low voltage panel area is sealed to prevent flames and
gases from entering; however, suitable personal protective equipment (PPE)
must be used whenever working on live circuits.
ATTENTION:
To ensure arc flash resistant integrity:
• The pressure relief vent must not be tampered with and must not be used as
a step.
• No alterations can be made to the ArcShield structure.
• All covers, plates, and hardware removed for installation or maintenance
purposes must be re-installed and properly secured. Failure to do so voids
the arc flash resistant integrity.
• Power cable entry points are to be treated as the boundary between a
hazardous location and sealed accordingly. Failure to do so voids the arc flash
resistant integrity.
• A plenum must be used to direct the arc flash energy to a suitable location.
Failure to do so voids the arc flash resistant integrity. See Publication 7712-
IN001 for plenum installation instructions.
• All wiring between the low voltage panel and the power cell must be routed
through a suitable gland to ensure flames and gases are not transmitted into
this area (as fitted from factory).
• The medium voltage power cell doors must be properly secured, using the
handle mechanism (refer to instruction label on the power cell door and
page 16 ). Failure to do so voids the arc flash resistance integrity.