Publication 2100-IN012B-EN-P - April 2005
6-2 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 user for each specific application. The
marking is similar to other NEC marking requirements, e.g., voltage, voltage
hazard labels, circuits, etc. 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. The user 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, e.g.,
switchboards, panelboards, industrial control panels, motor control
centers, etc.
• 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
Assistance
Rockwell Automation understands the importance of the user fulfilling the
field arc flash hazard marking requirements as defined by Article 116.10 in the
NEC. Rockwell Automation may assist the user in determining the necessary
arc flash marking as required by NFPA 70E.
Rockwell Automation may be of assistance in the following areas:
• Providing input on the specific Bulletin 2100 MCC design being utilized
• The zone determination for the NFPA 70E Hazard/Risk levels
• The user's required NEC field marking.
Further information may be obtained from MCC Arc Flash Marking Users
Guide, publication 2100-AT002x-EN-P.
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