It is called the common wire because it is connected to all the valves on that manifold. Common WireĮach multi-strand bundle must dedicate one wire as the common wire, which can be considered a ‘negative’ or a ‘ground’ wire. Each wire will have its own color such as white, black, blue, green, and red. 18 gauge wire should be used as this is the gauge that is approved for underground usage. For example, 18-5 is a group of 5, 18 gauge wires. Most systems will use multi-strand wire, which is a group of single, insulated strands of wire wrapped together as one, typically in black insulation. The controller then has modules for different wires that are labeled for zones (represented by the number of the zone), common ports, master valves (required for some systems), and rain sensors (if available). The AC transformer steps-down the power from 110 to 24 volts (approximately), which is operating voltage for the Spruce Controller and most irrigation controllers. For indoor use, these controllers can be plugged straight into a common house electrical outlet in the United States, Canada, and any other region that uses 110V for mains electricity. Most standard digital controllers, including Spruce, run off of 110/120 volts AC.
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