American Audio VELOCITY - REV 4-05 Operations Instructions download pdf (Page 176)

METRO RAIL DESIGN CRITERIA SECTION 9 / SYSTEMS

Appendix A

DE304.09 Appendix 9A-15

Metro Baseline Re-Baseline: 04/20/10

C Cross-connect wires shall be color-coded, twisted-pair, solid-core 22 AWG.

D Polarity of cross-connect wires shall utilize a consistent color code scheme.

E Solid and stranded conductors shall be of annealed copper wire in accordance

with ASTM B33, Class B, and Class C stranded conductors conforming to ASTM

B8, Table 2.

F Conductors in multi-conductor cables shall be individually and uniquely color-

coded.

4.5 TERMINAL BLOCKS

A Terminal blocks shall be approved screw or spring clamp type.

B Terminal blocks shall utilize full-depth insulating barriers or other approved

methods to protect exposed conductive wire.

C Terminal blocks shall accommodate up to two (2) 18 AWG wire for input and

output signals.

D All terminals and blocks shall be clearly labeled.

E Ring-tongue, compression-type lugs with full length insulating sleeves shall be

used for all screw-type terminal block wiring. No more than two wires shall be

connected to any terminal.

F Terminal blocks shall have finger safe terminals and bus bars for signals greater

than 48V.

G Line and supply terminal blocks shall be individually protected by replaceable

fuses with visual and electrical indication of status.

H Indicating fuse terminal blocks shall provide a single summary fuse indication

signal.

4.6 ITERFACE MODULES (IFM)

A All interface modules shall be vendor pre-manufactured, with removable field

wiring terminal blocks.

B Two terminals per point shall be provided for discrete IFMs.

C One LED indicator lamp shall be provided per point for discrete IFMs.

D Discrete output IFMs shall include one field replaceable relay per point with form-

C contact rating of 6A.

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American Audio VELOCITY - REV 4-05 Operations Instructions Page 176