You can create a new wiring rule set for a particular product line by defining a new node in the XML File.

<WiringRule description="Low Voltage">

The entry in quotes is the name of the rule set, which will appear in the Use Wiring Rules for drop-down list in the Shortest Distance dialog.

Define all your rules below this entry in the XML file. When you have finished entering your rules you will end the rule set by entering this line:

</WiringRule>

This marks the end of this particular rule set. All rules for this product line should appear between the two lines.