Wiring Specifications; 1: Length Limitations; 2: Calculating Wiring Distance For Sbus Modules - Honeywell SILENT KNIGHT 6700 Manual

Wiring Specifications

7. Slide the cover into place and tighten the cover mounting screws.
4.6 Wiring Specifications
4.6.1 Length Limitations
This section contains information on calculating SBUS wire distances and the types of wiring configurations (Class A and B).
4.6.2 Calculating Wiring Distance for SBUS Modules
The following instructions will guide you in determining the type of wire and the maximum wiring distance that can be used with SBUS
accessory modules.
To calculate the wire gauge that must be used to connect SBUS modules to the 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 modules 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 panel itself.
6860, 5860, 6855 Fire Annunciators
5824 Serial/Parallel Printer Interface Module
5880 LED I/O Module
5865 LED Annunciator
5895XL Intelligent Power Supply
5496 NAC Expander
SK-NIC Network Interface Card
CELL-MOD/CELL-CAB-SK
SK-F485C Fiber Converter
After calculating the total worst case current draw, Table 4.7 specifies the maximum distance the modules can be located from the panel on a
single wire run. The table ensures 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.
6700 Manual — P/N LS10148-001SK-E:F 8/29/2022
Figure 4.10 Cover Plate Mounting Keyholes and Cover Mounting Screws Alignment
Model Number
Table 4.6 SBUS Device Current Draw
cabinet
mounting
holes
Worst Case Current Draw
0.120 amps
0.045 amps
0.250 amps
0.200 amps
0.010 amps
0.010 amps
0.021 amps
0.145 amps
0.125 amps
Control Panel Installation
29