60 Publication 2100-IN012C-EN-P - April 2009
Chapter 5 Arc Flash Protection Marking as Required by the National Electrical Code
Arc Flash Marking
Clarification
The flash protection marking per NEC Article 110.16 is a field marking
requirement and is to be applied by the MCC end-user for each
specific application. The marking is similar to other NEC marking
requirements, for example, voltage, voltage hazard labels, and circuits.
However, flash protection markings must be based on application
information and calculations from the installation site. The intent of
the marking is to identify the presence of a potential flash hazard and
to provide assistance in determining necessary protective clothing and
personal protective equipment (PPE) that should be worn by qualified
electrical persons when servicing electrical equipment. You must
establish field marking requirements based upon:
• the level of the on-site personnel safety training.
• the level of required clothing and required PPE.
• consistency for the level of marking of various equipment, for
example, switchboards, panelboards, industrial control panels,
and MCCs.
• the available flash energy on each piece of equipment. This
energy is determined from available fault current, arc flash
duration due to the type and degree of short circuit protection
equipment.
Rockwell Automation
Services
Rockwell Automation understands the importance of you fulfilling the
field arc-flash hazard marking requirements as defined by Article
116.10 in the NEC. Rockwell Automation may assist you in
determining the necessary arc flash marking as required by NFPA 70E.
Rockwell Automation offers services that can provide assistance in the
following areas:
• Arc-flash hazard analysis
• Providing input on the specific Bulletin 2100 MCC design being
used
• The zone determination for the NFPA 70E Hazard/Risk levels
• Your required NEC field marking
For information regarding arc-flash hazard analysis, contact your local
Rockwell Automation sales office or distributor.
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