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If 1/0 THHN is rated at 150 amps @75 degrees and #4 THHN is rated at 85 amps. Can I runs 2 strands of #4 in place of 1 length of 1/0. Technically it would handle even more amps than 1/0. It's a short run.
 

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A "Handy Husband"
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Not code compliant.
 

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Licensed electrician
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Wires need to be larger than 1/0 before they can be paralleled.
 
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