American Audio VELOCITY - REV 4-05 Betriebsanleitung PDF herunterladen (Seite 93)

METRO RAIL DESIGN CRITERIA SECTION 9 / SYSTEMS

DE304.09 9-88 Revision 4 : 05/09/12

Metro Baseline Re-Baseline: 04/29/10

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.

9.4.5.19 Materials and Equipment

9.4.5.19.1 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.

9.4.5.19.2 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.

9.4.5.19.3 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.

All equipment-housing openings shall be screened or sealed to prevent entry of animals and

insects to the extent practicable. All entryways shall be sealed following installation of

cables and wiring entering the housing.

All insulation material used to line the interior of equipment housing walls, doors and roofs

shall be flame retarding and non-electrically conductive, and shall not introduce a hazard of

any type.

All equipment housings shall be designed to accommodate possible future expansion of

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American Audio VELOCITY - REV 4-05 Betriebsanleitung Seite 93