SECTION 1 - INSTALLATION
• Installation of the telephone intercom system involves the installation and wiring of the Entry
System By-pass Switch and the installation and wiring of the 1812 unit itself.
• Do not use thinly insulated brown-jacketed telephone wire (the type found in the walls of a
house) for any phone line wiring. These wires must be of the proper gauge and must be rated
for direct underground burial. A clear, noise free system is directly related to the quality of the
telephone wire used. Do not run telephone lines and high voltage lines in the same conduit.
Separate high voltage and telephone line conduits by at least six (6) inches. Be sure that all
phone wires are twisted.
TELEPHONE LINE WIRING
WIRE SIZE MAX DISTANCE IN FEET
24 AWG 800
22 AWG 1600
20 AWG 2200
18 AWG 3600
• It is highly recommended that telephone line surge suppressers (DoorKing p/n 1877-010) be
installed on both the phone in and phone out lines to help protect the system from power
surges.
• Use the supplied power transformer, 24 VAC, 20 VA (or U.L. listed equivalent) to power the
telephone intercom system. Do not power any other devices (electric strikes, magnetic locks,
etc.) from this power transformer. For wire runs up to 100 feet, use 18 AWG wire. For wire
runs up to 200 feet, use 16 AWG wire. Power runs are susceptible to noise and hum
pick-up, therefore it is preferable that you keep power runs as short as possible.
POWER WIRING
WIRE SIZE MAX DISTANCE IN FEET
18 AWG 100
16 AWG 200
• It is highly recommended that a low voltage surge suppresser (DoorKing p/n 1878-010) be
installed to help protect the telephone entry system from power surges.
• Proper grounding and the use of surge suppressers can significantly reduce the chance of
component failure because of static charges or surges. To be effective, ground connections
should be made with a minimum 12 AWG wire to a ground point within 10 feet of the
telephone intercom system. The ground point must be at an electrical panel, a metallic cold
water pipe that runs in the earth, or a grounding rod driven at least 10 feet into the soil. A
gooseneck mounting post anchored in concrete does not make a good ground.
1812-065-M-3-07 Page 9
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