NFPA 70E
Arrangement of 70E - questions and answers-Introduction (Article 90)
Chapter 1 Safety Related Work Practices
Chapter 2 Safety Related Maintenance Requirements
Chapter 3 Safety Requirements for Special Equipment
Annexes (Article 350)
Arc Flash Hazard - questions and answers-A dangerous condition associated with the possible
release of energy caused by an electric arc
Arc Rating - questions and answers-The value attributed to materials that describes their
performance to exposure to an electrical arc discharge. The arc rating is expressed in cal/cm^2
and is derived from the determined value of the arc thermal performance value (ATPV) or
energy of breakopen threshold (E BT) (should a material system exhibit a breakopen resoponce
below the APTV value). Arc rating is reported as either APTV or E bt, whichever is the lower
value.
Barricade - questions and answers-A physical obstruction such as tapes, cones, or
A-frame-type wood or metal structures intended to provide a warning and to limit access.
Barrier - questions and answers-A physical obstruction that is intended to prevent contact with
equipment or energized electrical conductors and circuit parts or to prevent unauthorized
access to a work area.
Shock boundaries - questions and answers-Limited approach boundary,
Restricted approach boundary,
Prohibited approach boundary (not in 2015)
Limited approach boundary - questions and answers-An approach limit at a distance from an
exposed energized electrical conductor or circtuit part within which a shock hazard exists.
Restricted approach boundary - questions and answers-An approach limit at a distance from an
exposed energized electrical conductor or circuit part within which there is an increased
likelihood of electric shock, due to electrical arc-over combined with inadvertent movement, for
personnel working in close proximity to the energized electrical conductor or circuit part.
Arc Flash Boundary - questions and answers-When an arc flash hazard exists, an approach
limit at a distance from a prospective arc source within which a person could receive a second
degree burn if an electrical arc flash were to occur.
Electrically safe work condition - questions and answers-A state in which an electrical conductor
or circuit part has been disconnected from energized parts, locked/tagged in accordance with
Arrangement of 70E - questions and answers-Introduction (Article 90)
Chapter 1 Safety Related Work Practices
Chapter 2 Safety Related Maintenance Requirements
Chapter 3 Safety Requirements for Special Equipment
Annexes (Article 350)
Arc Flash Hazard - questions and answers-A dangerous condition associated with the possible
release of energy caused by an electric arc
Arc Rating - questions and answers-The value attributed to materials that describes their
performance to exposure to an electrical arc discharge. The arc rating is expressed in cal/cm^2
and is derived from the determined value of the arc thermal performance value (ATPV) or
energy of breakopen threshold (E BT) (should a material system exhibit a breakopen resoponce
below the APTV value). Arc rating is reported as either APTV or E bt, whichever is the lower
value.
Barricade - questions and answers-A physical obstruction such as tapes, cones, or
A-frame-type wood or metal structures intended to provide a warning and to limit access.
Barrier - questions and answers-A physical obstruction that is intended to prevent contact with
equipment or energized electrical conductors and circuit parts or to prevent unauthorized
access to a work area.
Shock boundaries - questions and answers-Limited approach boundary,
Restricted approach boundary,
Prohibited approach boundary (not in 2015)
Limited approach boundary - questions and answers-An approach limit at a distance from an
exposed energized electrical conductor or circtuit part within which a shock hazard exists.
Restricted approach boundary - questions and answers-An approach limit at a distance from an
exposed energized electrical conductor or circuit part within which there is an increased
likelihood of electric shock, due to electrical arc-over combined with inadvertent movement, for
personnel working in close proximity to the energized electrical conductor or circuit part.
Arc Flash Boundary - questions and answers-When an arc flash hazard exists, an approach
limit at a distance from a prospective arc source within which a person could receive a second
degree burn if an electrical arc flash were to occur.
Electrically safe work condition - questions and answers-A state in which an electrical conductor
or circuit part has been disconnected from energized parts, locked/tagged in accordance with
