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Initial Length of Run from Interface to First ICM
In addition to the above wire sizing chart, if the chart recommends 14 AWG (2.5 mm
2
) wire path and the
initial run of wire between the Interface and the first ICM on the wire path is greater than 2,500 feet
(750m) then the initial length of wire (from interface to the first ICM) should be upsized by one additional
wire size to 12 AWG (4.0mm
2
). This is only necessary when 14 AWG (2.5 mm
2
) is the recommended wire
size. If the chart recommends 12 AWG (4.0 mm
2
) based on number of units and total length of run of the
wire path, then additional upsizing in a long initial run of wire is not necessary.
Wire Design Examples
Example 1 – An installation requires 300 ICMs on a single wire path and the Trunk wire length will be up
to 10,000 feet (3,000 meters). Utilizing the sizing chart the Trunk wire should use 14 AWG (2.5 mm
2
) MAXI
wire for the installation. Although there are multiple branches off the main Trunk wire, these are not part
of the calculation when determining the size of the Trunk wire. Each branch will also be 14 AWG (2.5 mm
2
)
wire.
IC System Design Guide, v2.4
13
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