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NFPA 70E QUESTIONS AND ANSWERS
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Arrangement of 70E ✔✔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 ✔✔A dangerous condition associated with the possible release of energy caused by an electric arc
Arc Rating ✔✔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 ✔✔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 ✔✔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 ✔✔Limited approach boundary,
Restricted approach boundary,
Prohibited approach boundary (not in 2015)
Limited approach boundary ✔✔An approach limit at a distance from an exposed energized electrical conductor or circtuit part within which a shock hazard exists.
Restricted approach boundary ✔✔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 ✔✔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.
Risk ✔✔A combination of the likelihood of occurrence of injury or damage to health and the severity of injury or damage to health that results form a hazard.
Risk assessment ✔✔An overall process that identifies hazards, estimates the potential severity of injury or damage to health, estimates the likelihood of occurrence of injury or damage to health, and determines if protective measures are required.
Working on (energized electrical conductors or circuit parts). ✔✔Intentionally coming in contact with energized electrical conductors or circuit parts with hands, feet, or other body parts, with tools, probes, or with test equipment, regardless of the PPE a person is wearing. There are two categories of "working on": Diagnostic (testing) is taking readings or measurements of electrical equipment with approved test equipment that does not require making any physical change to the equipment; repair is any physical alteration of electrical equipment (such as making or tightening connections, removing or replacing components, etc.).
Exposed (as applied to energized electrical conductors or circuit parts) ✔✔Capable of being inadvertently touched or approached nearer than a safe distance by a person. It is applied to electrical conductors or circuit parts that are not suitably guarded , isolated, or insulated.
Guarded ✔✔Covered, shielded, fenced, enclosed, or otherwise protected by means of suitable covers, casings, barriers, rails, screens, mats, or platforms to remove the likelihood of approach or contact by persons or objects to a point of danger.
Isolated (as applied to location) ✔✔not readily accessible to person unless special means for access are used
Insulated ✔✔Separated from other conducting surfaces by a dielectric (including air space) offering a high resistance to thee passage of current
Ground fault ✔✔An unintentional, electrically conducting connection between an underground conductor of an electrical circuit and the normally non-current-carrying conductors, metallic enclosures, metallic raceways, metallic equipment, or earth.
Article 100 ✔✔Chapter 1, Definitions
Article 110 ✔✔Chapter 1, General Requirements for Electrical Safety-Related Work Practices
Article 120 ✔✔Chapter 1, Establishing An Electrically Safe Work Condition
Section 130.4 ✔✔Approach Boundaries to Energized Electrical Conductors or Circuit Parts for Shock Protection
Section 130.5 ✔✔Arc Flash Risk Assesment
