Specifications

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washers, and appropriate connectors. Electrical Contractor to provide and connect #4 AWG
green insulated wire to ground point in electrical panel.
D. Equipment Racks
1. Assembly- Mount, wire, and fully test equipment in racks.
2. Ventilation - Provide ventilation adequate to keep temperature in rack below 100 degrees
Fahrenheit. Use "whisper" type ventilation fans in racks, adjusted to come on when
temperature in rack rises above 100 degrees Fahrenheit, only if adequate cooling cannot be
provided by Owner.
3. Rack Wiring - Wire equipment racks neatly, allowing proper slack for future serviceability.
Looking from rear of equipment rack AR-4, locate power, digital control, DC control, and
loudspeaker cables on right; and, locate microphone, line level audio on left. Maintain
separate cable bundles for different types of signals. Do not bundle power cords
permanently attached to equipment with other power cords. Do not block access to front-
mounted equipment with equipment mounted to rear rack rails.
E. Wiring
1. Wiring Standards - Execute wiring in strict adherence to standard audiovisual engineering
practices.
2. Field Connection Devices - Connect cable to active components through screw terminal
connections and spade lugs when appropriate. For BNC connections use three piece, dual
crimp BNC properly sized for cable with insulating bushings. Wire nut or "Skotchlock"
connectors are not acceptable. Do not wrap audio cable splices or connections with adhesive
backed tape. Punch connectors or telephone-style punch blocks are not acceptable
anywhere in the installation unless specifically authorized by Consultant
3. Cable in ceiling plenums to be run neatly parallel to building walls, supported every three
feet to structure.
4. Raceways - Run vertical wiring inside rack in Panduit (or equivalent) plastic raceways with
snap-on covers, sized to allow at least 50% future wiring. Mount raceways on full length %-
inch flat black plywood backboards, attached to rack sides. If between-rack wiring chases
are provided, Panduit raceways are not required. Horizontal wiring in rack to be neatly tied in
manageable bundles with cable lengths cut to minimize excess cable slack, but still allow for
service and testing. Provide horizontal support bars if cable bundles sag. Individually bundle
excess AC power cable away from rack mounted equipment with plastic cable ties. Electrical
tape and adhesive backed cable tie anchors are not acceptable.
5. Terminal Blocks - Connect wiring entering equipment racks via terminal blocks (Cinch 140 or
142 series). Leave terminal blocks fully exposed and labeled, mounted on %-inch plywood
painted flat black.
6. Accessibility - Ensure that wiring and connections are completely visible and labeled in rack.
Mount termination resistors, if required, on terminal strips, fully visible and not concealed
within equipment or connectors.
7. Loudspeaker Polarity - Connect loudspeakers electrically in phase, using same wire color for
loudspeaker wiring throughout project.
8. Physical Damage Prevention - Take necessary precautions to prevent physical damage to
cables and equipment. Damaged cables or equipment will not be accepted. Separate,
organize, and route cables to restrict channel crosstalk and feedback oscillation.
9. Hum Prevention - Ensure that electromagnetic and electrostatic hum is at inaudible levels.
For line level signals, float cable shields at the output of the source device. Do not cut or
remove shield conductors; fold back unconnected shields over cable jacket and cover with
clear heat-shrink tubing. Do not obstruct cable labels.
10. Other Connections - Make connections using rosin core solder or approved mechanical
connectors. Where spade lugs are used, crimp properly with ratchet type crimping tool.
Solder spade lugs mounted on #22 AWG or smaller cable after crimping.
3.2 INITIAL TESTS AND ADJUSTMENTS
A. Purpose - These tests are to ensure that system is ready for Final Tests and Adjustments
(described later).
Inspection -Verify prior to beginning actual tests and adjustments on systems.
1. Proper grounding of all electronic components (through third prong of power connector or
separate connection between component chassis and ground bus bar).