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			Connection to the switch is another length of bundled wire. I used the black from that run for the hot coming from the breaker and the white from the black coming off the tracks. So, technically, it's a hot on a white wire (that I marked).
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The cable being used here is 12-2 with ground cable, not 12/3. The 12 is the gauge, the 2 is two conductors (not wires). The ground is not a conductor, therefore is not counted.
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The markings on the cable indicated 12/3 so I used that in my description.
			
		
	
 Now I'm totally confused.  Can you post pictures?  Is this low voltage lighting?