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I just wound 100 feet of #10 romex THHN wire onto a 2" dia pvc conduit. I
also poly'ed a bunch of welding rods together to fit inside. I am hoping to
use this as a variac substitute, a variable inductor. I measured the
inductance with the rods in the coil and with them out of the coil, and the
numbers I found are 1.72millihenries with the rods fully inserted, and about
330microhenries with them not inside. (That last one might be off a bit, I
was paying more attention to the full insertion number.) 60Hz 120Vac
standard wall outlet is my power source. I forgot the formula for inductive
reactance. Anybody willing to crunch the numbers for me and tell me what
current range this will allow me? Another option is to arrange a brush deal
to use like a true variac. Just looking for some idea as to how useful this
will be, or what changes I ought to make. Thanks folks.
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