Sbus Wiring; Calculating Wiring Distance For Sbus Modules - Honeywell 6820EVS Installation And Optimization Manual

Model 6820 / 6820-EVS Installation Manual
outs (on either the main control panel or the RBB cabinet), that are not previously being used may be uti-
lized to connect conduit between the two cabinets.
4. Connect battery leads to the backup battery terminals. See Figure 4-6.
Observe the proper polarity to prevent damage to the batteries or the control panel.
5. Insert the RBB cover screws into the cover mounting holes. See Figure 4-6.
Screw the cover screw ¾ of the way into the cover mounting hole.
6. Align the cover plate mounting keyhole over the cover mounting screws. See Figure 4-7.
Figure 4-7 Cover Plate Mounting Keyholes and Cover Mounting Screws Alignment
7. Slide the cover into place and tighten the cover mounting screws. See Figure 4-7.
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

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 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.
6860, 5860, 6855 Fire Annunciator
5815XL SLC Loop Expander
6815 SLC Loop Expander
5824 Serial/Parallel Printer Interface Module
5880 LED I/O Module
5865 LED Annunciator
Mounting Keyholes
Table 4-1: SBUS Device Current Draw
Model Number
4-5
Cover Plate
Worst Case Current Draw
.120 amps
.150 amps
.078 amps
.040 amps
.250 amps
.200 amps
LS10144-001SK-E