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120V single phase will always be line to ground circuit. But if there is an available 120Volt line to line circuit in the building, is it permitted by code to be utilized regardless if the loads are light fixtures, receptacles or other general loads?
Hey Jessie thanks for your question. Alternating current systems supplying premises wiring must be grounded so the maximum voltage to ground does not exceed 150 volts as stated in 250.20(B)(1). See the definitions of Premises Wiring and Voltage to Ground in Article 100 for more information.
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