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PART
1910--OCCUPATIONAL SAFETY AND HEALTH STANDARDS
1910.308(e)
Communications systems
(e)
Communications
systems -
(e)(1)
Scope.
These provisions for communication systems apply to such systems as central-station-connected
and non-central-station-connected telephone circuits, radio and television
receiving and transmitting equipment, including community antenna television
and radio distribution systems, telegraph, district messenger, and outside
wiring for fire and burglar alarm, and similar central station systems.
These installations need not comply with the provisions of 1910.303 through
1910.308(d), except 1910.304(c)(1) and 1910.307(b).
(e)(2)
Protective
devices.
(e)(2)(i)
Communication
circuits so located as to be exposed to accidental contact with light
or power conductors operating at over 300 volts shall have each circuit
so exposed provided with a protector approved for the purpose.
(e)(2)(ii)
Each
conductor of a lead-in from an outdoor antenna shall be provided with
an antenna discharge unit or other suitable means that will drain static
charges from the antenna system.
(e)(3)
Conductor
location -
(e)(3)(i)
Outside
of buildings.
(e)(3)(i)(a)
Receiving
distribution lead-in or aerial-drop cables attached to buildings and lead-in
conductors to radio transmitters shall be so installed as to avoid the
possibility of accidental contact with electric light or power conductors.
(e)(3)(i)(b)
The
clearance between lead-in conductors and any lightning protection conductors
may not be less than 6 feet.
..1910.308(e)(3)(ii)
(e)(3)(ii)
On
poles. Where practicable, communication conductors on poles shall be located
below the light or power conductors. Communications conductors may not
be attached to a crossarm that carries light or power conductors.
(e)(3)(iii)
Inside
of buildings. Indoor antennas, lead-ins, and other communication conductors
attached as open conductors to the inside of buildings shall be located
at least 2 inches from conductors of any light or power or Class 1 circuits
unless a special and equally protective method of conductor separation,
approved for the purpose, is employed.
(e)(4)
Equipment
location. Outdoor metal structures supporting antennas, as well as self-supporting
antennas such as vertical rods or dipole structures, shall be located
as far away from overhead conductors of electric light and power circuits
of over 150 volts to ground as necessary to avoid the possibility of the
antenna or structure falling into or making accidental contact with such
circuits.
(e)(5)
Grounding
-
(e)(5)(i)
Lead-in
conductors. If exposed to contact with electric light and power conductors,
the metal sheath of aerial cables entering buildings shall be grounded
or shall be interrupted close to the entrance to the building by an insulating
joint or equivalent device. Where protective devices are used, they shall
be grounded in an approved manner.
..1910.308(e)(5)(ii)
(e)(5)(ii)
Antenna
structures. Masts and metal structures supporting antennas shall be permanently
and effectively grounded without splice or connection in the grounding
conductor.
(e)(5)(iii)
Equipment
enclosures. Transmitters shall be enclosed in a metal frame or grill or
separated from the operating space by a barrier, all metallic parts of
which are effectively connected to ground. All external metal handles
and controls accessible to the operating personnel shall be effectively
grounded. Unpowered equipment and enclosures shall be considered grounded
where connected to an attached coaxial cable with an effectively grounded
metallic shield.
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