voltage question

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I am working at an old apartment building going in and remod them and service calls. In most of these places i am finding strange voltages like 23 v and 75 v hot to ground and neutral. The whole place is wired in aluminum about every box i opened rec were burned up wires broken. Wires decayin fallin apart at joints in the boxes. I don't know what is causing this if anyone knows it would be greatly appreciated.
 
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