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Flash hazard warnings on certain types of electrical equipment warn that they might present an arc flash hazard if serviced while energized. Examples of this include electrical equipment that might be worked on while energized, such as switchboards, panel boards, control panels and motor control centers.
The NEC does not require the marking to describe the specific level of arc flash hazard or the required personal protective equipment. It simply requires a generic warning of the hazard of an arc flash. This is applicable in most situations except in individual dwelling units.
Other codes and standards such as NFPA 70E, Standard for Electrical Safety in the Workplace, require more information to be available and call for a more detailed analysis of the hazard, but these are not “installation” standards as the NEC is.
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