![]() Working within the RAB is only acceptable if an Energized Electrical Work Assessment has been completed and approved, or if the work is specifically exempt per NFPA 70E-2021 130.2(B)(3). A qualified person required to cross the RAB must be protected from unexpected contact with exposed energized conductors or circuit parts. Only qualified persons may cross this boundary. The Restricted Approach Boundary (RAB) is the approach limit for qualified persons to exposed, energized electrical components where there is an increased likelihood of electric shock due to electrical arc-over combined with inadvertent movement. Use NFPA 70E-2021 Table 130.4(E)(b) for direct current. either movable or fixed, column 2 or 3) in NFPA 70E-2021 Table 130.4(E)(a) for alternating current. The LAB is determined by selecting the voltage range and exposed conductor/circuit condition (i.e. Working within the LAB is only acceptable if an Energized Electrical Work Assessment has been completed and approved, or if the work is specifically exempt per NFPA 70E-2021 130.2(B)(3). Unqualified persons may only cross this boundary if they are under the direct supervision of a qualified person, and wearing the appropriate personal protective equipment for the hazards involved. It is the approach limit for unqualified persons. The Limited Approach Boundary (LAB) is the approach distance to exposed, energized electrical components within which a shock hazard exists. There are two shock protection boundaries the Limited Approach Boundary (LAB) and the Restricted Approach Boundary (RAB), and one Arc Flash Boundary (AFB) that must be established in order to provide a safe distance for personnel from exposed, energized electrical components. As part of the risk assessment process, approach boundaries should be determined. ![]()
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