![]() In accordance with Table 130.4(d), for systems operating at 50 volts to 750 volts ac, the limited approach boundary from fixed circuit parts is 3 ft. ![]() Limited approach boundary is defined in Article 100 of NFPA 70E as “an approach limit at a distance from an exposed energized electrical conductor or circuit part within which a shock hazard exists.” Therefore, in order to have a limited approach boundary, the cover(s) would have to be removed or the door(s) open, and there would have to be exposed live electrical conductors or circuit parts. Section 130.2 of NFPA 70E requires that energized electrical conductors and circuit parts that are operating at or over 50 volts be put into an electrically safe working condition if: (1) the employee is working within the limited approach boundary, or, (2) the employee is interacting with equipment where circuit conductors or parts are not exposed, but an increased likelihood of injury from exposure to arc flash hazard exists. As the realization of potential hazards due to arc flash events became more predominant in the mid-nineties, the Committee on Electrical Safety Requirements for Employee Workplaces, NFPA 70E, introduced the concept of the Electrically Safe Working Condition. Historically, lockout and tagout requirements were concerned with protecting electrical workers by controlling shock hazards. ![]() It differs from the OSHA requirements in that it does not distinguish between general industry and construction, nor does it specifically speak to employees that are performing servicing or maintenance of machines and equipment. NFPA 70E Article 120, Establishing an Electrically Safe Work Condition, provides the lockout and tagout requirements necessary to provide an electrically safe work environment for the employee. Establishing an Electrically Safe Work Condition (ESWC) is essential for a safe working environment.
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