UL COPYRIGHTED MATERIAL –
NOT AUTHORIZED FOR FURTHER REPRODUCTION OR
DISTRIBUTION WITHOUT PERMISSION FROM UL
2.18 PRESSURE TERMINAL CONNECTOR – A field wiring terminal that accomplishes the connection
of one or more conductors by means of pressure without the use of solder. A pressure terminal
connector may be the barrel and set screw type, crimp type barrel, or clamping plate and screw type.
2.18 effective April 13, 1993
2.19 PRIMARY CIRCUIT – Wiring and components that are conductively connected to a branch circuit
or an alternating-current motor generator set installed separately from, or included as, a part of a
power-converter or power-inverter system.
2.19 effective April 13, 1993
2.20 PRINTED WIRING BOARD – The finished combination of a pattern of conductive paths either on,
in, or both on and in (multilayer) a sheet of insulating material, including printed components, and the
base material.
2.20 effective April 13, 1993
2.21 PROTECTED ENVIRONMENT – Areas internal to the equipment that are resistant to entry of
carbon dust, or other conductive contaminants, and the like.
2.21 effective April 13, 1993
2.22 PROTECTED ENVIRONMENT ENCLOSURE – A part or total enclosure of an appliance that is
constructed as defined in Section 7, Enclosures Used for Protected Environments, so as to maintain a
protected environment.
2.22 effective April 13, 1993
2.23 RISK OF ELECTRICAL ENERGY - HIGH CURRENT LEVELS – The capability for damage to
property or injury to persons, other than by electric shock, from available electrical energy is considered
to exist, if between a live part and an adjacent dead metal part or between live parts of different
polarity, there exists a potential of 2 volts or more and either an available continuous power level of 240
volt-amperes or more, or a reactive energy level of 20 joules or more. For example, a tool, or other
metal short circuiting a component may cause a burn or a fire if enough energy is available at the
component to vaporize, melt, or more than warm the metal.
2.23 effective April 13, 1993
2.24 RISK OF ELECTRIC SHOCK – A risk of electric shock is considered to exist at any part if the
potential between the part and earth ground or any other accessible part is greater than 42.4 volts peak
ac or 60 volts dc, and the continuous current flow through a 1500 ohm resistor connected across the
potential exceeds 5 milliamperes.
2.24 effective April 13, 1993
2.25 RISK OF FIRE – A risk of fire is considered to exist at any component unless an investigation of
the supply delivering power to that component complies with the criteria in Section 6, Frame and
Enclosure.
2.25 effective April 13, 1993
2.26 RISK OF INJURY TO PERSONS – A condition that exists when stationary parts (such as sharp
metal edges and projections), moving parts (such as gears, chains, or linkages), falling objects,
inadequate mechanical strength of material, or the physical instability of the equipment are such that
injury to persons may result.
2.26 effective April 13, 1993
OCTOBER 15, 2004UL 45810
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