exposed-conductive-part conductive part electrical equipment, which can touched and
which not normally live, but which can become live when basic insulation fails
extraneous-conductive-part conductive part not forming part the electrical installation
and liable introduce electric potential, generally that earthing conductor
skilled person person with relevant education and experience enable him her avoid
dangers which electricity may create
instructed person person adequately advised supervised skilled persons enable him
or her avoid dangers which electricity may create
ordinary person person who neither skilled person nor instructed person
environmental conditions physical and chemical conditions external the product which it
is subjected certain time and comprising combination single environmental
parameters and their severity
Note: The environmental conditions are generally composed environmental
conditions appearing nature and environmental conditions generated the
product itself external sources.g.
environmental parameters one more physical chemical properties (e. temperature,
humidity, acceleration)
Example: The environmental parameter Vibration characterized the type of
vibration (sinusoidal, random), acceleration, frequency.
safety colour colour, special properties, which safety meaning attributed
safety sign sign, which gives general safety message, obtained combination colour
and geometric shape and which, the addition graphic symbol text, gives a
particular safety message
supplementary sign sign with text only, for use where necessary conjunction with a
safety sign
.BASIC TERMS AND DEFINITIONS FOR ELECTRICAL SAFETY AND ELECTRICAL INSTALLATIONS 19
unavailability (deprecated this sense) state item characterized its inability to
perform required function, for any reason
(electromagnetic) interference degradation the performance equipment, transmission
channel system caused electromagnetic disturbance
electrical equipment any item used for such purposes generation, conversion, transmission,
distribution utilization electrical energy, such transformers, apparatus,
measuring instruments, protective devices, equipment for wiring systems, appliances
live part conductor conductive part intended energized normal use, including a
neutral conductor, but convention not PEN conductor
Note: The acronym PEN results the combination both symbols for the
protective conductor and for the neutral conductor
