Honeywell INTELLIKNIGHT 5820XL - Manual (Page 95)

SD and SK SLC Device Installation
151209 5-5
Figure 5-1 and Figure 5-2 show how wire length is determined for out-and-back tap
and T-tap style wiring.
Figure 5-1 Calculating wire run length for a simple out and back tap
When using T-taps, the total length of all taps and the main bus must not exceed
40,000 feet. This requirement must be met in addition to the maximum distance
requirements for the various wire gauges.
Figure 5-2 Calculating Wire Run Length for a T-tap