68 Rockwell Automation Publication 2100-IN012G-EN-P - August 2016
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 is worn by
qualified electrical persons when servicing electrical equipment. You must
establish field marking requirements based upon the following:
• 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 can 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
Allen-Bradley distributor or Rockwell Automation sales representative.
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