American Audio VELOCITY - REV 4-05 Betriebsanleitung PDF herunterladen (Seite 175)

METRO RAIL DESIGN CRITERIA SECTION 9 / SYSTEMS

Appendix A

DE304.09 Appendix 9A-14

Metro Baseline Re-Baseline: 04/20/10

8. Input signals shall be isolated from the backplane.

9. The A/D converter shall provide a minimum precision of 4096 steps plus

one sign bit.

10. Continuous automatic calibration.

11. Common mode rejection shall be at least 50db at 50 and 60Hz.

12. Isolation of 500VAC/VDC withstand for one minute.

4.3 SUBPANEL

A All materials used in the assembly including cable insulation or sheathing, wire

troughs, terminal blocks, shall be made of flame retardant material and shall not

produce toxic gasses under fire conditions (see NFPA 75). The use of PVC shall

require approval. Each individual device shall be constructed so that by limiting

combustible materials, or by use of enclosures, fire is not likely to spread beyond

the device in which the source of ignition is located. Assemblies of floor standing

equipment having external surfaces of combustible materials of such size that

might contribute to the spread of an external fire shall have a flame spread rating

of 50 or less (see NFPA 255, Method of Tests of Surface Burning Characteristics

of Building Materials). (Note: UL listed equipment or equipment meeting the

requirements of UL standard number 478 will be considered as meeting the

above requirements.)

B The subpanel shall be metal, finished on all sides to resist corrosion in a marine

environment. The panel thickness shall be such that there is no deformation of

the mounted subpanel while performing maintenance and assembly procedures.

The panel material shall support drilling and taping of screws for installation of

components and fasteners by others.

C The maximum dimensions of the assembly including subpanel, all components,

cables, bending radius and connectors shall require no more than 22” wide x 20”

deep x 70” high for installation.

D The assembly shall be suitable for mounting on a standard 19”

telecommunications rack or plywood backboard.

E Mounting and enclosure shall be site specific adhering to all environmental and

other design criteria.

4.4 CABLES WIRES

A Each cable shall be labeled at both ends in a manner consistent with Contractor

drawings.

B Labels shall use non-fading, permanent marking, and can be read without

disruption of any component.

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American Audio VELOCITY - REV 4-05 Betriebsanleitung Seite 175