New York State Master Electrician Practice Exam

Question: 1 / 400

What percentage change in dwelling unit circuits running through another unit requires it to be brought up to code?

30%

50%

In residential electrical work, when modifying or upgrading electrical systems in multifamily dwellings, the National Electrical Code (NEC) dictates that if you replace a percentage of the existing wiring in a dwelling unit, it may trigger the need to bring the entire system up to current code standards. A key threshold for this requirement is 50%.

When more than 50% of the dwelling unit circuits are dealt with, the work often touches on safety considerations and overall compliance with the NEC. The rationale behind this requirement is to ensure that any significant alterations do not compromise safety by retaining outdated or inadequate wiring and circuit arrangements that could pose risks to residents. By requiring a full upgrade to meet current codes once a certain percentage is replaced, it ensures that all aspects of the electrical system function properly together and are safe for use.

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70%

100%

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