American Audio VELOCITY - REV 4-05 Betriebsanleitung PDF herunterladen (Seite 79)

METRO RAIL DESIGN CRITERIA SECTION 9 / SYSTEMS

DE304.09 9-74 Revision 4 : 05/09/12

Metro Baseline Re-Baseline: 04/29/10

stored within a logical process, sampled as digital or analog inputs, or produced

as digital or analog output, shall result in a safe system state.

Non-vital circuits may use non-vital relay or solid-state technology. Failures of non-vital

equipment shall not affect the safety of the system. Non-vital systems shall interface with

vital systems in a manner, which isolates the vital systems from malfunctions of the non-vital

systems.

Vital microprocessor systems may be used.

The use of radio, land cable, or any combination, which forms a serial communication

channel for the signal system, shall not be considered vital in itself. Design techniques shall

be employed such that the equipment at each end of the communication link shall be

capable of detecting errors in the data transmitted and received, such that system operation

remains safe.

9.4.4.16 Materials and Equipment

9.4.4.16.1 General

Assemblies and components used to perform identical functions within the system shall be

mechanically and electrically interchangeable. Standard commercially available equipment

and material from multiple sources shall be used where practicable.

All wayside equipment shall be secured and protected by the use of tamper-resistant

covers. Where deemed appropriate by the Designer, further protection shall be provided

with intrusion detection devices.

All cables and wires shall be suitably protected. Conduits shall be provided under tracks,

along bridges and through roadways, to meet AREMA recommendations. All material and

equipment furnished shall be new and standard products of manufacturers regularly

engaged in the production of like equipment, and shall be the latest design, which complies

with the requirements of these Contract Documents.

9.4.4.16.2 Equipment Location

Signal equipment shall be located along the wayside only where necessary. All other

equipment shall be located on the outer edge of the right-of-way, in easily accessible

equipment housings.

Signal houses shall be provided with a fire and intrusion detection system.

Signal masts, grade crossing gates, flasher masts, cantilever signal masts and all concrete

signal structures shall follow CPUC GO 75 and City requirements for these structures.

9.4.4.16.3 Equipment Housings

All signal equipment housings shall include all required environmental controls to facilitate

maintenance and operation, including any necessary heating, ventilation and air

conditioning. The signal equipment shall be capable of operation in the event of a failure of

any environmental control subsystems. Houses, cases and junction boxes shall be steel or

aluminum. Signal houses and cases containing electronic equipment shall be coated with

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American Audio VELOCITY - REV 4-05 Betriebsanleitung Seite 79