NFPA 70E Article 100 Definitions.

The arc flash boundary is an approach limit from an arc source at which incident energy equals 1.2 cal/cm2.
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The arc flash boundary is an approach limit from an arc source at which incident energy equals 1.2 cal/cm2.

The following definitions can be found in Article 100 of NFPA 70E:

Below is a sample of NFPA 70E. For the complete section, see the actual NFPA 70E text at NFPA.ORG. Once there, click on the free access link to NFPA 70E.

Balaclava.  An arc-rated head-protective fabric that protects the neck and head except for a small portion of the facial area.

Informational Note: Some balaclava designs protect the neck and head area except for the eyes while others leave the eyes and nose area unprotected.

Barrier. A physical obstruction that is intended to prevent contact with equipment or energized electrical conductors and circuit parts.

Bonded (Bonding). Connected to establish electrical continuity and conductivity.

Bonding Conductor or Jumper. A reliable conductor to ensure the required electrical conductivity between metal parts required to be electrically connected.

Boundary, Arc Flash. When an arc flash hazard exists, an approach limit from an arc source at which incident energy equals 1.2 cal/cm2 (5 J/cm2).

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NFPA 70E Article 100 Definitions.

Below is a Real Question from our Electrical Continuing Education Courses for Electrical License Renewal:

Which of the following is true regarding boundaries?

A: An arc flash suit is required outside all boundary types.
B: A Barrier prevents an arc flash from extending beyond the arc flash boundary.
C: An arc flash boundary is an approach limit from an arc source at which incident energy equals 1.2 cal/cm2.
D: An arc flash boundary is an approach limit from a voltage source at which voltage equals 1.2 cal/cm2.
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