Rockwell Automation 2100 CENTERLINE Low Voltage Motor Control Centers - Manual (Page 62)

62 Rockwell Automation Publication 2100-IN012E-EN-P - February 2012
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.