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250-ft 12 / 3 / Romex SIMpull Solid Indoor CU NM-B W/G Individual pack ( By-the-roll )

Southwire 250-ft 12 / 3 / Romex SIMpull Solid Indoor CU NM-B W/G Individual pack ( By-the-roll )

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I am installing 12/3 wire in a panel box. The red, neutral and ground are attached the black isn't. The Black is reading 80 volts. Is this normal?


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