BASIC TERMS AND DEFINITIONS FOR ELECTRICAL SAFETY AND ELECTRICAL INSTALLATIONS
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basic insulation insulation hazardous-live-parts providing first protection against electric
shock
double insulation insulation comprising basic insulation and supplementary insulation in
order provide protection against electric shock basic insulation fails
reinforced insulation single insulation system which provides protection against electric
shock equivalent double insulation
arm's reach zone accessibility touch extending from any point surface where
persons usually stand move about the limits which person can reach with the
hand any direction without assistance
enclosure housing for separating the internal and external environment
protective enclosure enclosure providing protection against electric shock from the internal
environment
protective barrier
barrier (deprecated)
protective cover (deprecated)
shroud (deprecated) restricted access areas, structure providing protection against direct
contact from any usual direction
obstacle restricted access areas, part preventing unintentional direct contact, but not
preventing direct contact deliberate action
earth electrode conductive part that constitutes electrically conducting interface with the
mass the earth
equipotential state the state when parts are substantially equal electric potential
equipotential bonding electric connection putting various exposed conductive parts and
extraneous conductive parts substantially equal potential
protective equipotential bonding equipotential bonding for protection against electric shock
in the event short-circuit
automatic disconnection supply interruption supply caused protective device
short circuit accidental intentional conductive path between two more points circuit
forcing the voltages between these points relatively low
fault the state item characterized inability perform required function, excluding
the inability during preventive maintenance other planned actions, due lack of
external resources
Note: fault often the result failure the item itself, but may exist without
prior failure.
disabled state
outage
