Class B Wiring Diagram (With Isolators)
For Class B wiring with isolators, T-Tapping is allowed. SLC wiring may be split multiple times to form SLC wire branches. Maximum wire distance of
each of these SLC branches from panel to any device is the smaller of the values obtained from Table 7 and the Equation 1 shown below. Add the
alarm loads of all the devices on an SLC wire branch and apply to Equation 1. Add the unit loads (see section Compatible TrueAlert Devices for unit
loads) for all devices on an SLC wire branch and the number of isolators and apply to Table 7. Use of Table 7 requires that all SLC wire branches join
within 10 feet (3 m) of the panel. T-tap wire stubs are allowed on the SLC wire branches, but each tap must be less than 100 feet (30 m).
Note: Each B+ and B- terminal is rated for 2 identical wires. This allows up to 4 Class B T-Tap circuits directly from each Terminal Block. See Figure 12.
Figure 11: Equation 1: Maximum SLC Wire Branch Length Based on Appliance Alarm Current Load
Figure 12: Class B Wiring, with Isolators
Note: 4905-9929 isolator.
page 16 579-336 Rev. M
4100-5120, 4100-5121, 4100-5122 TrueAlert Power Supply Installation Instructions
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