Bell System Plant Series Installation And Maintenance Manual

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BELL SYSTEM PRACTICES
Plant Series
SECTION 506-326-200
Issue 2, December 1967
AT
&
TCo Standard
COIN TELEPHONES-lA-TYPE
INSTALLATION AND MAINTENANCE
1.
GENERAL
1.01
•The
lAl
coin telephone can be converted
to a 1A2 coin telephone by replacing the
P-90C800 cover unit assembly with a P-91C600
cover unit assembly. No wiring changes are
necessary .•
1.02
This section is reissued to add information
on 1A2 coin telephone.
2.
LOCATION
2.01
Consider the following:
• Accessibility to customers
• Sufficient light
• Privacy
• Absence of noise and vibration
• Absence of grease, smoke, or dust
• Clearance from oily or dirty surfaces
• Clearance from stoves or heaters
• Clearance from moving machinery, piled
merchandise, or narrow aisles
• Mounting surfaces-Consult a supervisor
before locating coin telephone on finishes
that would be expensive to repair if the set
is removed.
• Inductive effects-Locate telephone and
associated wiring at least six inches from
neon fixtures, transformers, or other
interference-causing equipment.
3. BACKBOARDS
When mounting the •1A-type• coin
telephone, a ver.tical surface must be
provided. A tilt greater than 1-1/2
degrees in any direction will cause
malfunction of the telephone. A
vertical surface may be determined
by the following steps:
(1) Place a spirit level vertically against the
mounting surface with the top end of the
level at the required height of the coin telephone
(3.04).
(2) Move the top or bottom end of the level
away from the mounting surface as required
to obtain a vertical reading.
(3) When a vertical reading is obtained, the
end of the level opposite the point of contact
shall be no farther from the mounting surface
than described in Table A.
(4) Ensure that a vertical surface is obtained
in both directions.
TABLE A
METHOD FOR DETERMINING
A VERTICAL SURFACE
MAXIMUM DISTANCE
ALLOWED FROM SPIRIT
LEVEL TO MOUNTING
SURFACE ON OPPOSITE
SPIRIT LEVEL END FROM POINT
LENGTH
OF CONTRACT
18 inches
15/32 inch
24 inches
5/8 inch
30 inches 25/32 inch
36 inches
15/16 inch
© American Telephone and Telegraph Company, 1967
Printed
in
U.S.A. Page 1