1.2
SYSTEM DESCRIPTION
1.2.1
General
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NOTE: For data acquisition systems, the designer
must show on drawings the data transmission system
(DTS) selected for each circuit between media
components and the systems to be interconnected.
NEC (e.g., Sections 300.11 (A) and 800.5) does not
permit communication circuits to be supported by
suspended ceiling panels or suspended ceiling
support grids. Thus, give consideration for proper
support of cables and raceways.
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Coaxial cable data transmission system (DTS) for analog or digital
communications shall be provided as specified. The data transmission
system shall consist of: Coaxial Cable Modems repeaters, amplifiers, and
other equipment as required. All computing devices, as defined in 47 CFR 15,
shall be certified to comply with the requirements for Class A computing
devices and labeled as set forth in 47 CFR 15.
1.2.2
Electrical Requirements
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NOTE: The designer will show on the drawings the
characteristics of each voltage source.
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The equipment shall operate from a voltage source as shown. Equipment
shall tolerate voltage source variations of plus or minus 10 percent, and
60 Hz frequency variations of plus or minus 2 percent, with no degradation
in performance.
1.2.3
Power Line Surge Protection
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NOTE: The designer will determine if any additional
inputs or outputs require surge protection and show
the requirements for them on the drawings, or in a
schedule.
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Equipment connected to AC circuits shall be protected from power line
surges. Equipment protection shall withstand surge test waveforms
described in IEEE C62.41. Surge protection devices shall be selected based
on voltages and current ratings of the components to be protected. Fuses
shall not be used for surge protection.
1.2.4
Communications Circuit Surge Protection
Communications equipment shall be protected against surges induced on any
communications circuit. All cables and conductors which serve as
communications circuits shall have surge protection circuits installed at
each end at the communication circuit that meets the requirements of RUS
Bull 345-50. Additional triple electrode gas surge protectors meeting the
requirements of RUS Bull 345-83 shall be provided on each conductor within
0.9 m 3 feet of the building cable entrance. For cables that route between
SECTION 16794A
Page 6
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