Simplex 4100ESi Installation Manual page 79

See Figure 60 to check that cable distances are acceptable. For a Class A loop circuit, cable distance
refers to the full distance around the loop. For a Class B spur circuit, cable distance refers to the
distance from the panel to the furthest end of the cable.
Figure 60. IDNet cable distance and device limits for common cable sizes
IDNet sounder bases and 6 point I/O modules do not draw their alarm load from the loop; they are
powered from separate 24V terminals.
Where devices such as sounder bases are supplied from a 24V source, and cover more than one zone,
the power cable must be isolated between zones by a 4090-9117AU Power Isolator Module.
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