Bell System Practices 1A Installation And Maintenance

BELL SYSTEM PRACTICES
Station Operations Manual
Minor Station Systems
SECTION C70.201.01
Issue 1, November, 1959
AT&TCo Standard
1 A AND 1 A 1 SPEAKERPHONE SYSTEMS
INSTALLATION AND MAINTENANCE
1.00 INSTALLATION
Control Unit
1.01
Locate and install the control unit in
accordance with the following:
• Allow 20 feet maximum cable distance be-
tween the control unit and other com-
ponents of the speakerphone system.
• Mount control unit:
1.
On an insulated surface.
2. Within 6 feet of a 105- to 125-volt 60-
cycle ac commercial power outlet fur-
nished and maintained by customer.
Power outlet shall not be under control
of a wall switch.
• Place transmitter:
1.
Within convenient reach of customer.
2. Three feet minimum from loudspeaker.
Note:
There should be no obstruction between
the customer and transmitter or loudspeaker.
Under no circumstances connect the
power cord of the control unit until
all
work
is
completed.
• Fasten the power cord with a Tinnerman
clamp (5A or 6A) and an ES-528772
bracket. Attach a tag (form E-3013) to the
bracket. This is the same tag that is used
on ground wire clamps. In certain areas
where local ordinances prohibit this method
of securing the cord, place only the tag near
plug end of cord. Be guided by local
instructions.
Associated Components
1.02
Fig. 1 and 2 show typical installations.
Fig. 1 - Speakerphone System Components with
5928 Telephone Set
Fig. 2 - Speakerphone System Components with
Key Telephone Set and 656A Transmitter
©
American Telephone and Telegraph Company, 1959
Printed in U. S. A.
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