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The Arc Flash Boundary Chart shows how to calculate safe working distances based on incident energy and voltage. Learn how NFPA 70E defines protection zones.

Know where the arc flash boundaries are and keep these top safety measures in mind. The National Fire Protection Association (NFPA) recommends defining three boundaries to minimize risk of electrical injuries. Part of NFPA 70E highlights what each boundary is and how to determine where to place it.

NFPA 70E approach boundaries define specific distances from energized parts to reduce electrical shock and arc flash risks. These include limited, restricted, and prohibited boundaries, each requiring proper training, PPE, and authorization to enter safely.

Oct 25, 2018 · Under NFPA 70E, there are three boundaries that are observed—limited approach, restricted approach, (the shock protection boundaries) and arc flash boundary. These boundaries trigger multiple requirements in 70E including but not limited to determining the type and level of PPE and qualifications required to cross into each level.

The largest boundary sets the approach limit and determines where a barricade should be set up to alert others. We’ll look at how that safe distance is communicated, where it comes from, what it means, and who’s responsible for it.

Arc flash incidents pose significant risks to worker safety. However there are three types of boundaries to consider when approaching energized electrical equipment. It is important to know all approach boundaries and who may cross them and remain safe. What is an Arc Flash?

May 1, 2014 · NFPA 70E stipulates two approach boundaries in addition to the arc flash protection boundary that must be known and observed. The shock hazard boundaries are dependent on the system voltage and can be found in Table 130.4 (D).

Nov 30, 2021 · Having a detailed arc flash label on your equipment will spell out exactly what your arc flash boundary working distance is, ensuring you have the proper space to protect from arc flash.

Mar 20, 2025 · This guide explores the nuances of arc flash boundary determination, practical implementation strategies, and effective training methodologies designed to protect electrical workers from one of industry's most devastating hazards.

What is the Arc Flash Boundary? Simply put, the arc flash boundary is the distance at which an electrical arc can flash/expand outward, which may endanger employees working on electrical equipment. People that are not adequately protected must stay away from a potential arc flash source by this calculated minimum distance at all times.