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Saturday, April 21st 2012, 8:33pm

how many people use both COM posts when two are provided?

I am building my own irrigation controller for 12 zones, and I am wondering if I should have two COM positions or if one if enough. Any feeback would be appreciated. Thanks!


Supreme Member

Posts: 407

Location: Houston, Texas


Sunday, April 22nd 2012, 9:49am

This is if your have one common for the front yard and one for the front, or if you don't want to make a splice in the field before the timer. This is a convenient option, but most people don't over think it. It is a wire option that is nice because some times the wire is heavy gauge and you can't put 2 commons on the terminal strip because your wire is too thick.

If you are residential install, do what is convenient. But pay attention to wire sizing charts!!


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Monday, April 23rd 2012, 8:47am

Todd's got it.

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