American Audio VELOCITY - REV 4-05 Operations Instructions download pdf (Page 157)

METRO RAIL DESIGN CRITERIA SECTION 9 / SYSTEMS

DE304.09 9-152 Revision 4 : 05/09/12

Metro Baseline Re-Baseline: 04/29/10

insulators shall be used at crossovers. If Conductor Rail is used,

sectionalizing shall be by Mechanical section insulators.

c. The interfaces between the Main Line-Yard and Yard-Shops shall

include insulated overlaps or non-bridgeable section insulators. The

running rails at such interfaces shall be provided with insulating joints.

On the interface Main Line – Yard, normally open disconnect switch shall

be used on both the OCS and the running rails in order to allow the

connection of the Main Line to the Yard.

d. Inside the shop building(s), the OCS Catenary shall be sectionalized at

each entrance location to the building and at the center of the building,

by mechanical section insulators. Each track shall have a manually

operated switch for the feed to that Catenary. Where there are personnel

gantries, there shall be an electrical interlock system that will not allow

access while the Catenary is energized.

6. Span Lengths and Staggers

a. The span lengths (spacing between contact wire registration points) and

staggers shall be designed to provide for pantograph security (i.e., no

pantograph dewirement) and to maintain good current collection and

uniform wear of the pantograph carbon collector. Pantograph security is

established by maintaining a minimum contact wire edge distance (from

the tip of the pantograph) of 6 inches (3 inches at overlaps) under worst

operating condition. In addition, the contact wire shall be staggered to

provide for uniform pantograph wear.

b. The design shall consider the effects of environment, track geometry,

vehicle and pantograph sway, and installation and maintenance

tolerances. Vehicle roll into the wind shall be taken equal to 50% of the

maximum dynamic roll value in accordance with AREA Manual,

Committee recommendation, Bulletin 694.

c. The determination of span lengths for single wire systems shall take into

consideration the requirements of Rule 74.4 of CPUC General Order 95

regarding broken OCS suspensions and fastenings.

7. Catenary Conductors

a. The contact wire shall be solid grooved hard-drawn copper conforming

to ASTM B47

b. The messenger wire shall be standard hard-drawn copper conforming to

ASTM B189 with stranding conforming to ASTM B8, class B or higher.

c. Conductor tensions shall be in accordance with the requirements of

CPUC General Order 95. Thirty percent cross-sectional area loss due to

wear of the contact wire and the effect of temperature change shall be

taken into consideration in the design for conductor tension.

8. Contact Wire Heights

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American Audio VELOCITY - REV 4-05 Operations Instructions Page 157

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