Sbus Wiring; Calculating Wiring Distance For Sbus Modules - Honeywell Silent Knight IntelliKnight 5820XL Installation And Operation Manual

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IntelliKnight 5820XL Installation Manual

4.4

SBUS Wiring

This section contains information on calculating SBUS wire distances and the types of wiring

configurations (Class A and B).

4.4.1

The following instructions will guide you in determining the type of wire and the maximum

wiring distance that can be used with control panel SBUS accessory modules.

To calculate the wire gauge that must be used to connect SBUS modules to the control panel,

it is necessary to calculate the total worst case current draw for all modules on a single 4-

conductor bus. The total worst case current draw is calculated by adding the individual worst

case currents for each module. The individual worst case values are shown in the table below.

Note: Total worst case current draw on a single SBUS cannot exceed 1 amp. If a large number of accessory mod-

ules are required, and the worst case current draw will exceed the 1 amp limit, then the current draw must

be distributed using 5895XL Power Expanders. Each 5895XL Power Expander provides an additional

SBUS, with an additional 1 amp of SBUS current. Wiring distance calculations are done separately for

each 5895XL, and separately for the control panel itself.

5860 Fire Annunciator

5824 Serial/Parallel Printer Interface Module .040 amps

5880 LED I/O Module

5865 LED Fire Annunciator

5895XL Intelligent Power Supply

5496 Intelligent Power Supply

Note: Refer to Table 3-1 for maximum number of each type of device that can be used per system.

After calculating the total worst case current draw, Table 4-1 specifies the maximum distance

the modules can be located from the panel on a single wire run. The table insures 6.0 volts of

line drop maximum. In general, the wire length is limited by resistance, but for heavier wire

gauges, capacitance is the limiting factor.

4-6

Model Number

firealarmresources.com

Worst Case Current Draw

.100 amps

.250 amps

.200 amps

.010 amps

151209

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