Additional Terms in PEC Chapter 2
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A device capable to drawing lightning discharge
to it in preference to vulnerable parts of the protected area.
between a conductive or inductive metal object and an element of a lightning
protection system to accomplish electrical continuity between two.
A conductor formed of a number of wires stranded together.
concrete, masonry or metal vent protruding through the roof or attached to the
side of a building used typically in heating or venting, subject to protection
under Class I requirements.
All conductors, fittings, and fixture necessary
to protect ordinary buildings and structures not exceeding 23m in height
CLASS I Materials…
conductors, fittings, and fixture necessary to protect ordinary buildings and
structure exceeding 23m in height.
CLASS II Materials…
The portion of a lightning protection system
designed to carry the lightning discharge between air terminals and ground
Steel with a coating of copper to be bonded
A conductor encircling a building and
inter-connecting all ground terminals
An attachment to secure the conductor to the
gage hatches, vapor seals, pressure-vacuum breather valves, flame arresters, or
other reasonably effective means to minimize the possibility of flame entering
the vapor space of a tank.
When flammable vapors are mixed with air in certain proportions,
the mixture will burn rapidly when ignited. The combustion range for ordinary
petroleum products, such as gasoline, is from about 1.5 to 7.5 percent of
vapour by volume, the remainder being air.
FLAMMABLE AIR-VAPOR MIXTURES…
The vapors given from a flammable liquid at or
above its flash point.
temperature at which it gives off vapor sufficient concentration to form an
ignitable mixture with air near the surface of the liquid within the vessel as
specified by appropriate test procedure and apparatus.
Structures so constructed that gas or air can
neither enter nor leave the structure except through vents or piping provided
for the purpose
portion of a lightning protection system extending into the earth, such as a
ground rod, ground plate or the conductor itself, serving to bring the
lightning protection system into electrical contact with the earth.
For purpose of lighting protection, a building over 23m in height.
Metal objects at or above the eave or flat roof
level that are subject to a direct lighting stroke.
METAL BODY OF CONDUCTANCE…
Metal objects located within 2000mm of a
conductor subject to buildup of potential.
METAL BODY OF INDUCTANCE…
A building with either sides or roof made of or covered with sheet metal.
A building with
electrically continuous framing of sufficient size and conductivity to be
utilized as part of the lightning protection system.
A spark occurring between nearby metallic
objects or from such objects to the lightning protection system or to ground
As used in this Code, the term ____ means any short air space between
two conductors electrically insulated from or remotely electrically connected
to each other.
A smoke or vent stack is classified as
_________if the cross-sectional area of the flue is greater than 0.32m2
and the height is greater than 23m
STACK, HEAVY DUTY…
These are opening through a tank shell or roof
above the surface of the liquid.
The __________ provided by the grounded
air terminal or mast or overhead ground wire is that adjacent space which is
substantially immune to direct strokes of lightning
ZONE OF PROTECTION…
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