Does this wiring meet the NEC standards?

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The white wire is being used as an ungrounded (hot) conductor, though it has not been properly marked as such. Looks like a fairly large wire, so it's surely feeding a larger 240 volt load. The breaker that it's terminated at, should be a double pole breaker, and is likely rated 50 amperes (check handle label for rating).

The load being supplied by this circuit will require 240 volts only, so a grounded (neutral) conductor will not be required. Because of this, the circuit will be wired with a two conductor (plus ground) cable. Two conductor cables are manufactured with a black, white, and bare (or green) conductor inside. When using this type of cable for 240 volt circuits, the white wire can be used as a hot conductor. According to National Electrical Code, the white wire should be marked to indicate this...

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The National Electrical Code, 2008 edition

The National Electrical Code (NEC), or NFPA 70, is a regionally adoptable standard for the safe installation of electrical wiring and equipment in the United States. It is part of the National Fire Codes series published by the National Fire Protection Association (NFPA), a private trade association.[1] Despite the use of the term "national", it is not a federal law. It is typically adopted by states and municipalities in an effort to standardize their enforcement of safe electrical practices.[2] In some cases, the NEC is amended, altered and may even be rejected in lieu of regional regulations as voted on by local governing bodies.

The "authority having jurisdiction" inspects for compliance with these minimum standards.[3][4]

Background[edit]

The NEC is developed by NFPA's Committee on the National Electrical Code, which consists of 19 (20 in 2008) code-making panels and a technical correlating committee....

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