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Free NC Electrical Contractor Exam (Unlimited) Practice Questions
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Question 1 of 10Bonding and Grounding
An electrician needs to decide which of four systems at a plant must be grounded under 250.20(B), since the system voltages fall between 50 V and 1000 V. The plant has several distribution arrangements, and the electrician must separate those that are required to be grounded from those that are permitted to run ungrounded. Which system must be grounded?
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