Rockwell Automation Publication 1512A-UM101B-EN-P - December 2021
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Appendix
A
ArcShield Unit Information
Overview
ArcShield™ units have a robust arc resistant enclosure design that has been
tested per IEEE C37.20.7 (2001). Each ArcShield structure was tested to
withstand the effects of an arc flash at 40 kA or 50 kA for 0.5 seconds. ArcShield
units provide an enhanced Type 2B accessibility level.
ATTENTION:
Do not connect Bulletin 1500 ArcShield arc-resistant products to
motor control centers that are not arc-resistant.
Rockwell Automation has not tested or validated the mechanical or electrical
interconnections between these two enclosures.
Connecting these two styles of equipment nullifies all arc-resistant ratings
for the entire dissimilar equipment configuration. This type of configuration
could pose electrical safety risks to site personnel and nullify some safety
labeling already applied to the different styles of equipment.
ATTENTION:
To maintain arc resistant integrity, the following rules must be
followed and verified before energization:
• The pressure relief vent on top of each section may not be tampered with,
and it is not to be used as a step.
• No alterations can be made to the ArcShield structure.
• All covers, plates, and hardware that is removed for installation or
maintenance purposes must be reinstalled and properly secured. Failure to
do so voids the arc 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
resistant integrity.
• A plenum or chimney must be used to direct the arc flash energy to a
suitable location. Failure to do so voids the arc resistant integrity. See
for plenum installation instructions. See
for chimney
installation instructions.
• The arc gas plenum system must be installed per the instructions contained
herein. The intent of the arc gas plenum system is to make an air tight
connection between the motor control section and the plenum and any
external exhaust points. Failure to follow these instructions, and create air
tight seals at all joints, will result in moisture buildup inside the arc gas
plenum and possible equipment damage or failure.
• 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 both
the handle mechanism and the door bolts (refer to instruction label on the
power cell door and
). Failure to do so voids the arc
resistance integrity.