I am trying to install a Nest Protect (co/smoke alarm) and need to connect a black wire to the power line (which is the the one with the red cap after I used a voltage detector) and the white wire to the neutral line. I need help with the following:
1) how do I know which is the neutral and which is the interconnect - I think the neutral is the single black line pictured with the yellow cap as the white line needs to be connected with the braided line for the other lights to work so I thought that would be the interconnect. Does that sound right?
2) how do I join the black wire from my Nest to the power line when the power line is those three lines with a copper tip in the red cap?