High Tech Pet HUMANE CONTAIN X-10 Installation, Operating And Training Manual page 16

Calculate the total length of wire required to ensure that you have
enough to complete the installation. Remember that twisted wire counts
as twice its length since there are two strands. Figure 7 shows a basic
wire length calculation.
In preparing your layout, note that you will need to allow for a field width
of at least 3 feet (preferably 6 – 10 ft.) on each side of the boundary wire.
Your dog will need at least another 5 to 10 ft. for a safe roaming area.
Avoid making passageways too narrow or your dog may be hesitant to
use them.
WIRE LENGTH CALCULATION
BURIED WIRE
TWISTED
WIRE
Length of Field Wire = 15' + 85' + 220' + 100' + 190' + 30' = 640'
Length of Twisted Wire = 8' x 2 = 16'
Total Wire Required 656'
Figure 7
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