151430-L8 IDP and SD SLC Device Installation
7-4
Figure 7-1 and Figure 7-2 show how wire length is determined for out-and-back tap and T-tap style wiring.
Figure 7-1 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 7-2 Calculating Wire Run Length for a T-tap
IDP device max loop resistance = 40 ohms
SD device max loop resistance = 50 ohms
IDP device max loop resistance = 40 ohms
SD device max loop resistance = 50 ohms
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