Final answer:
Service equipment rated at 1200 amperes or more must be labeled to warn of potential electric arc-flash hazards. This labeling is part of wider electrical safety systems and devices designed to prevent thermal and shock hazards.
Step-by-step explanation:
The question pertains to the safety requirements for labeling service equipment to warn of potential electric arc-flash hazards in settings other than dwelling units. According to safety standards (which can be found in documents like the NFPA 70E), service equipment that is rated at 1200 amperes or more must have a permanent label applied either in the field or factory to warn of these hazards. The arc-flash labeling serves as a critical reminder for qualified personnel about the potential risks associated with operating or working near such equipment.
Electrical safety systems and devices are implemented to mitigate thermal hazards and shock hazards. Devices such as plastic insulation on live/hot wires, circuit breakers, and the three-wire system with live/hot, neutral, and earth/ground wires are all examples of how industry standards safeguard against these hazards.