From: "Frank Haber" 

We'll just be emitting gas here until you measure that AC input voltage. 
You have two options.

1. Stay up all day and all night with a pencil and notebook, and record
readings every few minutes.
2. Get something that logs or records those readings, like a Dranetz.
 Warning - a simple multimeter often doesn't take waveform into account.  The
Dranetz does ("true RMS," or something close)

(BX is still supposed to be illegal in Manhattan, except to replace
existing BX.  I think. EMT only.  No Romex need apply (rats).

And never trust a landlord.

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