Honeywell 7800 Series Operating Instructions Manual page 4

3.5.1 table 1: Recommended Wire sizes and Part numbers.
Application
14, 16, or 18 AWG (0.75, 1.5 or 2.5 mm
Line Voltage Terminals
Keyboard Display 22 AWG (0.34 mm
Module KDM a
Data ControlBus™ 22 AWG (0.34 mm
Module
Remote Reset Module
Communications
Interface ControlBus™
Module
13 Vdc full wave rectified
transformer power input
a The KDM, Data ControlBus™ Module (for remote mounting or communications) or Communication Interface Control-Bus™ Module
must be wired in a daisy chain configuration, (1(a)-1(a), 2(b)-2(b), 3(c)-3(c)). The order of interconnection of all the devices listed
above is not important. Be aware that modules on the closest and farthest end of the daisy chain configuration string require a 120
ohm (1/4 watt minimum) resistor termination across terminals 1 and 2 of the electrical connectors for connections over 100 feet
(30.5 meters).
3.5.2 table 2. Recommended Grounding Practices.
Ground type Recommended Practice
1. Use to provide a connection between the subbase and the control panel of the equipment. Earth
ground must be capable of conducting enough current to blow the 15A fuse (or breaker) in the event of an
internal short circuit.
Earth ground (subbase
2. Use wide straps or brackets to provide minimum length, maximum surface area ground conductors. If a
and relay module).
leadwire is required, use 14 AWG copper wire.
3. Make sure that mechanically tightened joints along the ground path are free of nonconductive coatings
and protected against corrosion on mating surfaces.
Signal ground (Keyboard
Use the shield of the signal wire to ground the device to the signal ground terminals—3(c)—of each
Display Module, Data
device. Connect the shield at both ends of the daisy chain to earth ground.
ControlBus Module™
Recommended Wire size
tor, 600 volt insulation, moisture-resistant wire.
2 ) two-wire twisted pair with ground, or
five-wire.
2 ) two-wire twisted pair with ground, or
five-wire.
22 AWG (0.34 mm 2 ) two-wire twisted pair, insulated for
low voltage.
22 AWG (0.34 mm 2 ) two-wire twisted pair with ground.
18 AWG (0.75 mm 2 ) wire insulated for voltages and
temperatures for given application.
2 ) copper conduc-
Belden 8723 shielded cable or equivalent.
Belden 8723 shielded cable or equivalent.
Belden 8723 shielded cable or equivalent.
EN-4
Recommended Part numbers
TTW60C, THW75C, THHN90C.
–
TTW60C, THW75C, THHN90C.