Examples - Rain Bird IC System Design Manual

Example 3 – An installation requires 400 ICMs on a wire path and the trunk wire length will be up to
8,000 feet (2,439 meters). The length of run from the ICI to the first ICM on the wire path is 3,500 feet
2 TM
(1,067 meters). Utilizing the sizing chart the Trunk wire should use 14 AWG (2.5 mm ) MAXI wire for
the installation. As the initial 3,500 feet (1,067 meters) is greater than 2,500 feet it requires an increase
2
in wire size to 12 AWG (4.0mm ). The initial 3,500 feet (1,067 meters) of Trunk wire should be sized at
2
12 AWG (4.0mm ) from the ICI to the first ICM. After the first ICM, the Trunk wire can continue at 14
2
AWG (2.5mm ).
Although there are multiple branches off of the main Trunk wire, these are not part of the calculation
2
when determining the size of the Trunk wire. Each branch will also be 14 AWG (2.5 mm ).
TM
15
IC System Design Guide, v2.3