High Tech Pet humane contain HC-8000 Installation And Operation 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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