American Audio VELOCITY - REV 4-05 Operations Instructions download pdf (Page 103)

METRO RAIL DESIGN CRITERIA SECTION 9 / SYSTEMS

DE304.09 9-98 Revision 4 : 05/09/12

Metro Baseline Re-Baseline: 04/29/10

Radio Antenna Sleeves consist of one and one-half inch (12") I.D. non metallic

sleeves through walls. These sleeves shall be utilized for routing of leaky coax

(radio antenna) cables, which are part of the distributed radio antenna system.

1. Sleeves shall be provided through walls, into all rooms or areas accessible

to the general public and LRT and HRT operating or maintenance personnel.

2. Sleeves shall be located as far above the finished floor as practical without

causing the antenna to interfere with any equipment on either side of the

wall.

3. Four (4) two inch (2") GRS conduits from the TC & C room to each trackway

shall be provided, total of eight (8) conduits. When the TC & C room is

located on other than the platform level, these four conduits shall extend to

the outside of the trainway.

4. Two (2) two inch (2") sleeves shall be placed vertically from the TC & C

room through the ceiling to above grade to accommodate antenna cable for

off air interfaces.

5. For those locations requiring off-air repeaters for Radio Services, required

size GRS conduit shall be provided between the TC & C Room and each

surface antenna location. Routing shall be determined on a site-by-site

basis.

G. Public Address Conduits

1. General

a. Public Address Conduits generally consist of the following:

1) Embedded conduit from the TC & C room to the speaker zone with

interruptions at speaker backboxes or junction boxes.

2) An embedded return conduit from the last speaker in a "string" to the

TC & C room.

3) Conduits in ancillary areas may be surface mount and shall have a

two-hour fire rating.

2. All conduits shall be GRS. No other circuits may be shared in a PA conduit.

All PA conduits shall originate and terminate in the TC & C room. Minimum

size is one inch (1").

3. Two separate one-inch conduits run directly from a backbox (8 x 8) or

junction box at the approximate midpoint of the mezzanine ceiling and the

midpoint of the platform ceiling to the TC & C room.

H. Closed Circuit Television Conduits

Conduits for the Closed Circuits Television system consist of two conduits in

parallel, both serving each camera location. Maximum six camera locations may

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American Audio VELOCITY - REV 4-05 Operations Instructions Page 103