DoorKing 1808 Telephone Access Plus - Manual (Page 19)

1.3 Power Wiring
Do not run telephone lines / data lines and high voltage lines in the same conduit. Separate high
voltage and telephone / data line conduits by at least six (6) inches.
POWER WIRING
WIRE SIZE MAX DISTANCE IN FEET
18 AWG 100
16 AWG 200
Access Plus Units operate on 16.5 VAC. Do not power these devices with 24 volt AC power. If
the OV LED is ON, the input voltage is too high. Check the transformer to be sure it is rated at
16 VAC. Use the supplied power transformer, 16 VAC, 20 VA (or U.L. listed equivalent) to power the
Access Plus unit. 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.
Surge Suppression and Grounding
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 device being protected.
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.
It is highly recommended that telephone line surge suppresser (DoorKing p/n 1877-010) be installed
to help protect the system from phone line power surges and a low voltage surge suppresser
(DoorKing p/n 1878-010) be installed to help protect the telephone entry system from power surges.
Surge suppresser must be provided a ground point within three (3) feet of the surge device.
1810-162-J-1-12 Page 19
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Mic
Vol
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Speaker
Vol
Keypad
OV
Over Voltage
LED
ON
SW1 MODEM / TCP ENB
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SW2
ON
TERMINATION
OFF RS-485 RX
BAD DNS LAN DOWN
Phone Line
In Use
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