American Audio VELOCITY - REV 4-05 Betriebsanleitung PDF herunterladen (Seite 155)

METRO RAIL DESIGN CRITERIA SECTION 9 / SYSTEMS

DE304.09 9-150 Revision 4 : 05/09/12

Metro Baseline Re-Baseline: 04/29/10

considerations, and shall be in accordance with the standards and

criteria specified herein.

2. Codes and Standards

a. In general, the OCS design shall be in accordance with the State of

California Public Utilities Commission (CPUC) General Orders (class T

circuitry, grade C construction), as more specifically set forth herein. In

no case can exceptions be taken to the General Orders without the prior

approval of the Authority and, ultimately, the CPUC.

b. Additional codes and standards shall be applicable to specific aspects of

the design as set forth herein.

3. System Description

a. Subways

In subways and tunnels, a low profile Simple Catenary Fixed Termination

(SCFT) or Conductor Rail system shall be used.

SCFT consists of a single contact wire and a messenger wire located

over the track. The system shall be fixed termination, with the result that

conductor tension will vary with temperature. The Catenary shall be

supported by direct insulated attachment of the messenger wire to the

subway or tunnel ceiling, with the contact wire registered by support

arms. The limited clearance requires close support spacing to minimize

system depth. System depth is defined as the vertical distance

measured at each support location, between the messenger and contact

wires.

The Conductor Rail consists of a contact wire clamped on the lower side

of a box shape aluminum profile. The contact wire should be solid

grooved copper 350 MCM per ASTM B47. At the transition from catenary

system to the to the conductor rail system, a transition bar should be

used to accommodate a smooth transition and absorb the vibrations of

the incoming contact wire. At tunnel mouths or at locations where

dropping water is expected, protection must be provided such as a

protective plastic cover clipped on the conductor rail profile. A typical

conductor rail system consists of Expansion joints, Fixpoint anchors,

Endpoint anchors, Electrical connections, Section insulators, Clips for

hooking standard earthing rods etc

b. At Grade Street Running

On the at-grade sections, a low profile Simple Catenary Auto-Tensioned

(SCAT) shall be used, unless special considerations determine

otherwise. The Catenary system shall consist of a messenger wire with a

single contact wire supported by vertical hangers. The system shall be

designed to meet capacity and power requirements without the use of

supplementary along-track feeders. The system shall be auto-tensioned

by means of weight-tensioning devices located at the termination points

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