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Selecting Sprinkler Wire

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I am going to purchase some 18 gauge wire for my sprinkler system. I will have 10 zones with 3 different valve boxes. Do I need to selecting a multi-strand wire for the total valves ( 10+ 1 common wire) or can I select a strand number for the number of valves that will be at one location.

Example: Valve box 1 - 4 valves
Valve box 2 - 4 valves
Valve box 3 - 2 valves

Could I get by with running three paths of 5 stranded wire since the most valves that will be hooked up will be 4?

Thanks
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