16, 18, 20, will all work the same. I have all three and speaker wire, telephone wire, you name it... What you have on hand will work... """. Your track voltage will be 18 to 20 VAC... Your Accessories will be @22VAC max. (most transformers)... With what you are showing now, I don't think you have to worry about busing... When you expand'... it will be something to consider'....
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