NEC Code Compliant Arc Flash Labeling
Arc Flash Explosion Accidents
The National Electrical Code (NEC) broke new ground in 2000 when it began mandating the need to warn people performing maintenance on electrical panels about the hazards of arc flash and the subsequent need to wear very specific personal protective equipment (PPE). Examples include specialized gloves, clothing and face shields. The purpose of the NEC-mandated warning labels is to protect people from being killed by the incredible explosive energy released during an arc flash event. Many workers die each year as a result of arc flash explosion accidents – and most are killed because they weren’t wearing the proper PPE. The requirement for the new warnings was, and is, meant to help make sure such accidents are few and far between.
Arc Flash Labeling
In 2000, just as the NEC arc flash labeling requirements were being finalized, Clarion was selected by the electrical industry to assist in the development of sample designs that demonstrated each of the two types of labels under discussion. The first was a general warning meant to be placed on the equipment by the equipment’s manufacturer. The second was a more specific warning that would be developed as the result of an arc flash study performed after the equipment is installed. Clarion’s sample designs became the de facto state-of-the-art for the industry. And they still are.
The Two Label System
As referred to above, the NEC labeling requirement actually creates the need for two different labels. The first is a general warning, installed by the equipment manufacturer, which communicates that an arc flash hazard is present. This label usually conveys a general hazard avoidance message that states something to the effect of, "Appropriate PPE is required when working on this equipment. Follow NFPA 70E requirements.” The reason this label is general in nature is that specific guidance for the exact PPE needed to avoid injury from an arc flash explosion cannot be defined until the equipment is actually installed and an arc flash study performed.
The second tier warning is a more detailed, best practice safety marking which gives the reader very specific information. This label is created after an arc flash study has been performed on the installed equipment. If there is more than one piece of equipment, each arc flash label is unique, with serialized information relevant to each specific location appearing on each individual label. This type of label identifies the severity of the arc flash hazard, the explosive force distances involved, and the exact type of PPE required to best avoid possible injury as defined by NFPA 70E.
Arc Flash Symbols
When it comes to the exact symbol to be used on your arc flash labels, until recently there was not a single standardized graphic available to warn of this hazard. In the end of 2016, ISO adopted a symbol for the meaning of “To warn of an arc flash.” The new arc flash symbol has been registered in ISO 7010 Graphical symbols – Safety colours and safety signs – Registered safety signs and is considered “best practice” from an ISO design perspective.
Through our leadership in ANSI and ISO, Clarion is pleased to have been a part of this change which will help to promote a global understanding of the potential for arc flash hazards – to better reduce risk and protect people. In line with our commitment to providing the very best in visual safety communication, our standard arc flash label designs align with ISO 7010; Clarion symbol number I6643 (as shown below) replaces past symbols used for arc flash. Our arc flash labels are compliant with ISO 7010, as well as ANSI Z535, NFPA 70E and NEC.
PAST SYMBOLS NEW ISO SYMBOL (I6643)
Arc Flash Studies
Clarion is aware of several highly qualified product safety and product liability prevention-focused firms who specialize in performing arc flash studies. See our resources page for their contact information.