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I have taped the white line to block to show that the switched line from each switch is actually hot.
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I don't understand what you're saying here, makes no sense to me. I'm thinking you connected the two together to prove it's a switch loop but not sure. So, I'll try to explain a few things and maybe I'll answer your question by doing so.
If these switches have both a black and a white wire connected to them then they are wired in a switch loop fashion, meaing that the power comes into the circuit from the light. This means the white wire is actually a hot wire and not a neutral wire, so this white wire should be remarked at both ends to indicate it is a hot wire. Do this by coloring it black using a majic marker.
So, if you turn this switch off it will not disconnect the power in the circuit going to the light, the only way to remove the power is to open the breaker for this circuit. And this should be done no matter what you're working on.
If you've opened the breaker and you still read 30 volts then yes, rest assured that this is phantom voltage. These voltages can even be higher than 30 volts. Use an analog meter to verify and I bet you won't read anything. Here's a link that'll help explain some of the details.
http://repairfaq.ece.drexel.edu/REPA...ml#APPFAQJ_019
Hope this helps and ask back with anything else.