American Audio VELOCITY - REV 4-05 Betriebsanleitung Seite 99

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METRO RAIL DESIGN CRITERIA SECTION 9 / SYSTEMS
DE304.09 9-94 Revision 4 : 05/09/12
Metro Baseline Re-Baseline: 04/29/10
cable, the distant end (where the cable goes) and the route that it
takes.
7) All equipment terminating frame blocks shall be clearly stenciled on
the front of the block with the nomenclature of the equipment
terminating on the block.
8) In addition to 1) through 7) above, all racks at the Central Control
communications equipment room shall have identification at the top
of the rack as to what LRT and HRT line the equipment is associated
with. At any location where communications equipment from
different Metro Transit Systems reside in the same room, all racks
shall have line or project identification at the top of the rack.
B. Electromagnetic Compatibility
1. Electromagnetic compatibility (EMC) control shall insure that all
Communications subsystems operate in their intended electromagnetic
environments without either causing or suffering harmful interference
because of electromagnetic emission or response. A primary objective shall
be to develop signal levels, apparatus, components, and installation
parameters to assure an electromagnetically compatible system. This
objective shall be achieved through coordination of Communications system
apparatus selection, design and installation with other electromagnetic
equipment, such as the communication equipment (radio, CCTV, etc.),
traction power system, AC power distribution system, vehicle propulsion
apparatus, TC system, and other nearby facilities. The approach to
implementation of EMC shall include control of:
a. Conductively coupled interference
b. Interference coupled through common impedance
c. Interference coupled through radiated electric fields
d. Interference coupled through radiated magnetic fields.
2. The control of electromagnetic interference shall employ, but not be limited
to, the following methods:
a. Shielding
b. Grounding
c. Balancing
d. Filtering
e. Isolation
f. Separation and orientation
g. Circuit impedance level control
h. Cable design
i. Frequency management
j. Power level
C. Grounding
Ground electrical equipment enclosures in accordance with NFPA 70
requirements. Per the requirement of Art. 645 in the NEC the grounding of
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