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Code Question of the Day

The Code Question of the Day (CQD) is NECA and ELECTRICAL CONTRACTOR Magazine’s flagship National Electrical Code (NEC®) public forum for the industry. The daily distribution of Q&A generates a lively dialogue and shares relative Code-based practical responses.

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September 13, 2024

Question:

Hi CQD, we have an installation where we increased the wire from 3/0-copper to 500Kcmil-copper, for a 200-amp circuit, to compensate for voltage drop. The inspector is requiring the equipment grounding conductor to be upsized as well. Is this required by code? What is the code article? Thanks Jeff L. 

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September 12, 2024

Question:

Good morning, what are the placarding requirements when PV equipment i.e., Inverter, Production Meter, ESS etc… cannot be installed in the same location as the service disconnect? All the best, Tom B. 

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Answer:

Hi Tom, Part IV of Article 690 provides guidance on the various marking requirements for PV system installations.  

Additionally, section 705.10 requires a permanent plaque directory that complies with the following: 

  1. Installed at each service equipment location or at a readily visible location 

  1. The plaque must denote the location of each power source disconnecting means for the building or structure.  

  1. The plaque or directory must be grouped with other on-site power source directories.  

  1. The plaque must be marked with the wording: “CAUTION: MULTIPLE SOURCES OF POWER”.