6700 Manual — P/N LS10148-001SK-E:F 8/29/2022 29
Wiring Specifications Control Panel Installation
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.
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.
Figure 4.10 Cover Plate Mounting Keyholes and Cover Mounting Screws Alignment
cabinet
mounting
holes
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.
Model Number Worst Case Current Draw
6860, 5860, 6855 Fire Annunciators 0.120 amps
5824 Serial/Parallel Printer Interface Module 0.045 amps
5880 LED I/O Module 0.250 amps
5865 LED Annunciator 0.200 amps
5895XL Intelligent Power Supply 0.010 amps
5496 NAC Expander 0.010 amps
SK-NIC Network Interface Card 0.021 amps
CELL-MOD/CELL-CAB-SK 0.145 amps
SK-F485C Fiber Converter 0.125 amps
Table 4.6 SBUS Device Current Draw
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