NFPA 70E Definitions Study Guide 2026–2027 |
Essential Electrical Safety Terms, Definitions &
Exam Prep
Arc Flash Hazard - correct answers -A source of possible injury or damage to health associated with the
release of energy caused by an electrical arc.
Arc Rating - correct answers -The value attributed to materials that describes their performance to
exposure to an electrical arc discharge. The arc rating is expressed in cal/cm2. Arc rating is reported in
either ATPV or Ebt.
Barricade - correct 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 - correct 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 work area.
De-Energized - correct answers -Free from any electrical connection to a source of potential difference
and from electrical charge
Electrical Hazard - correct answers -A dangerous condition such that contact or equipment failure can
result in electric shock, arc flash burn, thermal burn, or arc blast injury.
Electrically Safe Work Condition - correct answers -A state in which an electrical conductor or circuit
part has been disconnected from the energized parts, locked/tagged in accordance with established
standards, tested to verify the absence of voltage, and if necessary, temporarily grounded for personnel
protection.
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Essential Electrical Safety Terms, Definitions &
Exam Prep
Arc Flash Hazard - correct answers -A source of possible injury or damage to health associated with the
release of energy caused by an electrical arc.
Arc Rating - correct answers -The value attributed to materials that describes their performance to
exposure to an electrical arc discharge. The arc rating is expressed in cal/cm2. Arc rating is reported in
either ATPV or Ebt.
Barricade - correct 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 - correct 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 work area.
De-Energized - correct answers -Free from any electrical connection to a source of potential difference
and from electrical charge
Electrical Hazard - correct answers -A dangerous condition such that contact or equipment failure can
result in electric shock, arc flash burn, thermal burn, or arc blast injury.
Electrically Safe Work Condition - correct answers -A state in which an electrical conductor or circuit
part has been disconnected from the energized parts, locked/tagged in accordance with established
standards, tested to verify the absence of voltage, and if necessary, temporarily grounded for personnel
protection.
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