If your lawn has additional areas connected with a passage and the mower is able to drive through it, then you should bear in mind the following rules:
1.
The minimal distance between the wires in such passage should be 15 cm / 6”.
2.
The minimal width of such passage should be 80 cm / 2.5ft”.
3.
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If your lawn has areas, that are completely separated (by a fence, sidewalk, pathway, etc.), then you can extend the perimeter wire to cover such secondary areas as shown in the picture.