Rockwell Automation Publication 1500-UM055I-EN-P - December 2021
77
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 for 0.5 seconds. ArcShield units
provide Type 2B Accessibility.
ArcShield Design
ArcShield units typically include a pressure relief vent on the roof of the
structure (some incoming units may not have a pressure relief vent if top cable
entry is required). Under arc flash conditions the pressure relief vent will open
allowing hazardous flames and gases to exit the enclosure via the plenum or
chimney system. 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:
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 ensure Arc resistant integrity, it is important to ensure that
the following rules are followed:
• The pressure relief vent 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 and plates removed for installation or maintenance purposes
must be re-installed and properly secured. Failure to do so voids the arc
resistance 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. Refer to
for plenum installation instructions. Refer to
chimney 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 both
the handle mechanism and the door bolts (refer to instruction label on the
power cell door and refer to
Opening the Medium Voltage Doors on page 30
). Failure to do so voids the arc resistance integrity.
Содержание 1512B
Страница 6: ...6 Rockwell Automation Publication 1500 UM055I EN P December 2021 Notes...
Страница 74: ...74 Rockwell Automation Publication 1500 UM055I EN P December 2021 Chapter 4 Maintenance Notes...
Страница 76: ...76 Rockwell Automation Publication 1500 UM055I EN P December 2021 Chapter 5 Spare Parts Notes...
Страница 106: ...106 Rockwell Automation Publication 1500 UM055I EN P December 2021 Appendix E History of Changes Notes...