6 December 2006
Including change 1, 7 December 2006
Dead Front--Without live parts exposed to a person on the operating side of the
Deenergized-- A system component (or components) which has been "locked, tagged,
tested, and grounded" (note: "grounded" applies to high voltage).
Earth Ground--An electrical connection to earth obtained by a grounding electrode
Emergency Lighting System--A system capable of providing minimum required
illumination specified in NFPA 101, Life Safety Code, Section 5.9. It includes the
lighting units, related backup power source(s), and required connections.
Energized Electrically connected to or having a source of voltage.
Equipment--A general term which includes fittings, devices, appliances, fixtures, and
apparatus, and like items used as part of, or in connection with, an electrical power
transmission and distribution system, or communication systems.
Equipment - Climbing--Includes body belts, safety and climber straps, climbers and
Equipment - Electrical Inspecting and Testing--Electrical and mechanical devices
Equipment - Mobile and Portable Large Equipment--Relatively large equipment
items easily transported for maintenance, which must include line trucks, aerial lift
trucks, motor-generator sets, pole hole diggers, and similar apparatus.
Equipment - Protective--Includes rubber gloves, line hose, matting, blankets, insulator
hoods, and sleeves, in addition to barricades and warning devices.
Equipment Grounding Conductor--The conductor used to connect the non-current
carrying parts of conduits, raceways, and equipment enclosures to the grounded
conductor (neutral) and the grounding electrode at the service equipment (main panel)
or secondary of a separately derived system, such as an isolation transformer.
Exposed (as applied to live parts) Circuit is in such as position that, in case of failure
of supports or insulation, contact with another circuit may result. Capable of being
inadvertently touched or approached nearer than a safe distance by a person. It is
applied to parts that are not suitably guard, isolated, or insulated.
Flash Hazard--A dangerous condition associated with the release of energy caused by
an electric arc.
Flash Protection Boundary--The distance from an arc source (energized exposed
equipment) at which the potential incident heat energy from an arcing fault on the