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6AWG copper wire would be the minimum because that a 60A subpanel but with a 105ft distance you have actually too lot voltage drop and also need come go as much as 4AWG copper to keep the voltage drop in ~ acceptable limits (usually 5%).
The National electric Code publication / post 110.14 (c)(1) identify temperature restrictions for circuits and feeders the 100 amp or less. If the circuit is 100 amp or less you have to size the conductors based on the 60-degree celsius obelisk unless the breaker and the devices terminations are rated for 75 or 90 degrees.
You need to use a #4 conductor to feed a 60 amp circuit.
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What dimension wire required for 100a subpanel 120ft far from residence sub panel? greatest amp draw will be a home window A/C unit, and also a pool pump
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