APPENDIX
Switchbank Wiring
GENERAL WIRING
Where possible, locate the control center centrally, relative to
the rooms being served, in order to minimize the length of
speaker cables. It is advisable that the unit be so oriented that
the operator, program director, or other interested parties are
able to observe the controls at all times. Provide adequate light-
ing and ventilation. Do not locate the control center close to
heat sources, such as radiators or warm-air ducts, or against a
wall which would inhibit air flow through and around it.
Wires-Class II wiring
may be used for all audio and annunci-
ator lines. Make certain to properly support cables to prevent
sagging or strain. Keep wires clear of objects which would sub-
ject them to heat, friction, or other abuse.
Use No. 18 AWG shielded pairs with insulated outer jacket for
speaker lines. Annunciator lines require a third wire, which
usually is No. 18 AWG insulated wire with clear insulation. The
number and type of wire running from each room to the control
center are dependent upon the type of speaker operation re-
quired. Refer to Table I for suggestions.
Call Switches and Speakers
Outlet
Boxes-Flush-mounted switches require single-gang
outlet boxes; make certain to place them in a location which
will allow personnel to readily access the switch for call-in
and/or communicating via the room speaker. Suggested height
(above finished floor) for installation of switches is about four
feet; speakers should be placed at a height of about seven and
one-half feet.
Soldering Instructions
Solder-Do not use acid-core solder or acid paste.
Make all
solder connections with standard 60/40 resin-core radio solder.
Do not apply excessive heat; soldering irons or guns rated from
75 to 200 watts provide ample capacity.
Grounds-Do not connect cable shields to earth grounds or
convenient metal objects.
It is important to connect cable
shields only as shown in the wiring diagrams.
STATION WIRING
CAUTION
Make certain to connect all wires according to
color-codes given in the appropriate diagram.
Series CA- switches are designed for flush-mounting in a stan-
dard single-gang electrical outlet box, or for surface mounting
in a standard deep single-gang wire mold outlet box. Locate the
box to allow personnel convenient access to the switch for call-
in and/or communicating via the room speaker.
CONTROL CENTER WIRING
Remove the rear panel to access the switchbank terminals. A
row of male centerline terminals is located across the rear of
each switchbank; an individual selector switch corresponds to
the four terminals directly behind it.
Wire switchbanks as shown in Figure 5, using one female
centerline plug (Bogen Model Number 25-18, Panduit or
equivalent. Centerline plugs are also available in #20 and #22,
Bogen Model Numbers 25-20 and 25-22) to terminate wires
from speaker and/or call switch; connect shield to the ground
terminal.
This is the only place where speaker shields should be
grounded.
Voice Call-In Option
Figure 6 shows room connections and the customer-supplied
switch required for voice call-in. The wiring must be completed
by connecting the shielded pair from the switch to the terminal
strip at the rear of the MCP35 chassis. The polarity of the inner
conductors is not critical, but make certain to connect this cable
shield to the shield of the cable already connected to the ter-
minal strip.
Note that only one cable goes to the terminal strip. Usually,
cables from all room switches utilizing this function are con-
nected by a common control cable, and one cable is run to the
control center. If this type of installation is not practical, the
control cables for two or more switches are run to the control
center and are connected in parallel at a junction box; a single
control cable is then run to the terminal strip at the rear of the
MCP35 chassis.
Call/Privacy Option
Figure 7 shows the room connections and switch required for
incorporating the optional privacy feature in the system.
MAINTENANCE
CAUTION
There are no user-replaceable parts within the
unit. Have all internalservicing done by a qualified
technician. The warranty will become void if
repairs are made by other than the Bogen Service
Department or an authorized service agency.
BOGEN SERVICE
Our Service Department is interested in the maintenance of
your Bogen equipment. In the event of any difficulty, do not
hesitate to ask our advice or assistance. Information may be ob-
tained by writing to: Service Department, Bogen, A Lear
Siegler Company, P.O. Box 575, Ramsey, NJ 07446.
When communicating with us, give the model and series
designation of your unit, describe the difficulty and include
details on the electrical connections to associated equipment,
such as amplifiers, speakers, etc. We will send you information
if the remedy appears simple. If service is required, we will send
you the name and address of the nearest authorized Bogen Ser-
vice Agency.
When shipping your unit, pack it well, using the original ship-
ping carton or a similar container and filler material to prevent
damage in transit. Send the unit, fully insured and prepaid, via
UPS or any responsible carrier. It will be returned to you
freight prepaid while in warranty.
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