Bell 502-120-200 Service Manual

BELLSYSTEM PRACTICES SECTION 502-120-200
AT&TCo Standard Issue 5, September 1980

TELEPHONE SETS AND ASSOCIATED STATION APPARATUS

SELECTION OF INDOOR LOCATIONS

1. GENERAL or shower can be reached no matter where the

telephone is located the customer should be cautioned

1.01 This section serves as a guide in planning of the possibility of electric shock if the telephone

the location of connecting blocks and associated is used while in the tub or shower.0

station apparatus under the following conditions.

• For general indoor use water and moisture. Locations near windows

• At normal temperatures OUT OF SERVICE condition should be discouraged.

• In a non-explosive atmosphere can cause corrosion in connecting blocks, mount all

• At dry locations, floor (electrical outlet height). Also special connecting

1.02 This section is reissued to: should be used.i,

• Update figures 2.04 Perimeter space around wall telephone

• Add additional information and guidelines insure that future substitutions to possibly larger
to follow when placing telephone set and sets (example: repertory dialers, etc.) can be
associated station apparatus accomplished by unplugging and plugging on the

• Update to modular connecting blocks, the connecting block.

2.03 STelephone equipment can be damaged by

and sinks where rain or moisture could cause an

In high humidity areas or locations where moisture

connecting blocks 12 inches or more above the

blocks with spring loaded covers (example: 625S)

connecting blocks should be considered to

new telephone without the necessity of moving

1.03 Whenever service is provided in other than 2.05 0Thetemperature range for normal operation

the above locations, refer to the appropriate of most telephone sets is from zero degrees F
sections in Bell System Practices covering special to 120 degrees F. Except as noted below, exposure
installation, to temperatures outside this range should not result

2. PLANNING Some telephones such as the TOUCH-A-MATIC ®

2.01 The location for telephone apparatus suggested 32 degrees F.I'

by the subscriber should be given prime

consideration, pointing out to the customer any Note: STelephone equipment should not be
safety hazard, maintenance, or appearance problem, subjected to temperatures above 145 degrees F.

2.02 SBathrooms are not a preferred location as spacers or covers will melt causing permanent

for telephone sets. If the customer insists damage to the equipment.l,

on placing a telephone there, it should be located
so that the telephone and/or handset cannot be 2.06 Locations should be avoided where the room
used while in the bathtub or shower. Provide noise is likely to cause customer complaints

only standard length mounting cords and handset of "Can't hear" or "Can't be heard." However,
cords on telephone sets located in the bathrooms, if no quieter location is available, review the section
If the size of the bathroom is such that the tub on apparatus for use at noisy locations. In addition,

Not for use or disclosure outside the

Bell System except under written agreement

Printed in U.S.A. Page 1

in permanent damage but may cause malfunctioning.

16 telephone set may not function properly below

At temperatures above this, plastic parts such

NOTICE

SECTION 502-120-200

apparatus should be accessible for maintenance 3.01 SWart Sets: Connecting blocks for wall
and free from accidental mechanical damage or mounted telephone sets should be at

receiver-off-hook trouble, approximately 54 inches in height unless the customer

2.07 SPlacingtelephone apparatus near fluorescent
light unit may result in inductive noise._l 3.02 Desk-Type Telephone Sets.

2.08 Where the appearance of the completed (a) Consider which hand the customer uses to
installations may have a bearing on customer hold the handset before selecting a location

choice of location, inform the customer as to where on the desk for the telephone set. An improperly
it may be necessary to have holes drilled, also placed telephone instrument could create a
where and how wire or cable will be placed and nuisance by causing the handset cord to pass
exposed, across papers or other items in front of the

2.09 Discourage locations on finely finished surfaces
such as: (b) I_Discourage connecting block locations where

• Marble two tables or desks by stretching the mounting

• Expensive wood paneling

• Caramic or glass tile a desk, inspect for special wiring facilities

• I_Plastic laminate._l such as knock-out discs or rubber grommets for

2.10 If the location selected for the station
apparatus Sis in an area where conventional 3.03 ConneetinK Blocks.

stapled wire installations are not permitted or are
not desirable_l (ceramic or glass tile, etc.), consider (a) I_Whenever a desk is against a wall, the

using adhesive backed B Station Wire and a telephone connecting blocks and wire should
625C connecting block mounted on a 723 terminal be fastened to the wall, not the desk. If a desk

base which has adhesive backing and does not is not near a wall, the connecting block should
require holes for mounting. I_Refer to Section be fastened to the desk using nondamaging

461-200-206 for station wire installation.0 magnetic or adhesive backed type fastenings

2.11 Consider the use of available conduit or desk should be located high enough to hold the

prewired facilities when planning station cord off the floor. A convenient mounting area

apparatus locations, is usually on the upper part of the outer panel

2.12 When the customer desires a telephone in a

dimly lighted location or where security and SNore: Connecting blocks may be installed

safety may warrant the use of the telephone during with the modular opening facing either left,
the night, a set with dial night-light such as the right or down, but never with the opening

PRINCESS ® telephone (700-type) or a set with an up.41
illuminating dial such as the TRIMLINE ® telephone
(Fig. 2) should be recommended to the subscriber. (b) Connecting blocks attached to walls or

3. LOCATING moisture free during normal floor cleaning and

SNore: Inside walls are considered primary
locations for connecting blocks and telephones. 3.04 Ringers or Signals.

Whenever possible and with the concurrence
of the customer, they should be used instead (a) External ringers or signals should be placed

of outside walls.0 in locations where they can be easily heard,

and/or conditions require different heights._l

subscriber.

a telephone instrument is to be used between

cord across an aisle or passageway.41

(c) Before attaching any telephone apparatus to

which may be provided by the manufacturer,

the telephone set's mounting cord (see Fig. 6).

and blocks.e A connecting block placed on a

(Fig. 5).

baseboard should be high enough to remain

scrubbing.

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