American Audio VELOCITY - REV 4-05 Betriebsanleitung PDF herunterladen (Seite 164)

METRO RAIL DESIGN CRITERIA SECTION 9 / SYSTEMS

Appendix A

DE304.09 Appendix 9A-3

Metro Baseline Re-Baseline: 04/20/10

closure. However the design shall accommodate fused wetted contacts where

necessary.

3.2 ASSEMBLY

A Components within assemblies shall be neatly arranged and fastened securely to

the assembly subpanel with nonflammable fasteners. The use of plastic wire

troughs shall be subject to review and approval. Metal wire clamps shall have

insulating inserts between the clamps and the wiring. Wiring between stationary

and movable components, such as wiring across door hinges or to components

mounted on extension slides, shall allow full movement of the component without

bending or chafing the wiring.

B Each assembly shall include suitable signal and safety ground networks. The

safety ground shall be isolated from the signal ground and shall connect to the

ground (green) wire of the ac power input or to a dedicated ground wire for DC

powered assemblies. The signal ground shall terminate at a separate stud

connection, sized for connection of a lugged No. 2/0 AWG ground wire. Use of

the enclosure frame, skins, or chassis mounting hardware for the ground network

will not be considered acceptable. Assembly grounding shall be subject to

approval.

C The assembly shall have four distinct functional areas: power distribution, logic

controller, auxiliary equipment and I/O.

D Cables and wires shall be neatly arranged and secured/fastened to permit

maintenance access to all equipment without the need to disturb any wire or

cable.

E Adequate space shall be allocated for routing and management of I/O module

cable.

F Space for routing and management of field interface cable shall be provided at

each side of the I/O section. 2”x4” (width x depth) metal vertical cable

management brackets shall be installed along each side of the I/O section for

securing field cables of up to 1” diameter.

G The auxiliary equipment area shall have a minimum dimension of 8”x16”.

H The I/O area shall include reserved space for installation of optional indicating

fused feed thru terminal blocks for distribution of wetted contact control outputs.

Space for at least 33 terminal blocks shall be provided.

I The power distribution area shall include reserved space for mounting of an

auxiliary power supply and fused load circuit terminal blocks. Incoming power

terminal blocks shall have a spare line, neutral and ground terminal block

reserved for installation of the auxiliary power supply.

J All panel indicators shall be visible from the front of the assembly subpanel.

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American Audio VELOCITY - REV 4-05 Betriebsanleitung Seite 164