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Registered User
Join Date: Jul 2013
Location: Emerald Isle, NC
Posts: 503
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Some older residential has 3-phase, usually to run HVAC equip. It will have a high leg that will read 220v to ground, two other legs which read 110v to ground. Not too common today.
Local code will supersede NEC in many communities. This will often cover the 15a-20a recep mismatch. Some local codes disallow 14ga. branch circuit wiring. Breaker is sized to the wire, not the recep.
Carter
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