AT&T MERLIN LEGEND Release 2.0 Equipment And Operations Manual page 66

Introduction
Table 1-4. - Continued
Backboard Mounting Hardware Requirements
Wood surface
Concrete surface, brick, cinder block
Plaster, plasterboard
Sheet-metal surface
Hardware should have a combined pullout force of 650 lb (294.8 kg).
When mounting to sheet-metal walls, attach to structural members.
Location
Within 5 feet (1.5 meters) of dedicated AC power outlet (1 plug per carrier)
Within 1000 cable feet (304.8 m) of telephones
Heat Dissipation
Fully loaded basic carrier
Fully loaded 2-carrier system
(basic carrier plus one expansion carrier)
Fully loaded 3-carrier system
(basic carrier plus two expansion carriers)
Power Requirements
Basic carrier
2-carrier
3-carrier
Temperature/Humidity Range
40°-104°F (4°-40°C)
20%-80% relative humidity
Ventilation
1 inch (2.5 cm) on right and left sides
Radio Frequency Interference (RFI) Tolerance 1 V/m
In most cases, electrical noise is introduced to the system through trunk or
telephone cables, However, electromagnetic fields near the control unit
may also induce noise in the system. Therefore, the control unit and cable
runs should not be placed in areas where a high electromagnetic field
strength exists. Radio transmitters (AM or FM), television stations,
induction heaters, motors (with commutators) of 0.25 horsepower (200
watts) or greater, and similar equipment are leading causes of
interference. Small tools with universal motors are generally not a problem
when they operate on separate power lines. Motors without commutators
generally do not cause interference. Field strengths below 1.0 volts per
meter are unlikely to cause interference.
The field strength produced by radio transmitters can be estimated by
dividing the square root of the emitted power in kilowatts by the distance
from the antenna in kilometers. This yields the approximate field strength
in volts per meter and is relatively accurate for distances greater than
about half a wavelength (150 meters for a frequency of 1000 Hz).
1-38 System Capacities and Requirements
Wood screws
Masonry anchors
Toggle bolts
Sheet-metal screws
500 Btu/hr
1000 Btu/hr
1500 Btu/hr
6 0 H z ± 5 % 3 A
117VAC
117VAC 6 0 H z ± 5 % 6 A
60 Hz±5%
117VAC
(35 cal/sec)
(70 cal/sec)
(105 cal/sec)
9A