Electrician Inspector’s Perspective
AHJ: Field problems
Question: How are jurisdictions enforcing 230.71(B)? Specifically, regarding meter pedestals, and 320-ampere continuous, 2-200-ampere main breaker type services.
Answer: Referencing 230.71(B)(4), the key wording for consensus is “in a separate compartment.” Included in the minutes is a 230.71(B) compliant example of service equipment with more than one service disconnect in a single enclosure. Pictures say a thousand words, simply stated; Where there is more than one service disconnect in an enclosure, not to be confused with branch and feeder OCPD’s, this would not comply with 230.71(B), unless they are in separate compartments within the service equipment enclosure.
Question: Why is PV the only renewable energy source AHJ’s require an electrode system upgrade in addition to the scope of work?
Answer: When referencing 690.47, it is the building or structure supporting a PV system that the NEC requires to utilize an electrode system. No, AHJ’s are not “picking on” PV installers, but simply enforcing 690.47. Many older homes do not have compliant electrode systems. This brings the question; What is a compliant electrode system? Although electrode system is not defined, section 250.50 does provide prescriptive guidance on how to form the electrode system. Where a roof mounted array is installed, forming an electrode system per 250.50 for the building or structure is required per 690.47.
Question: Does the 2020 NEC now require tamper-resistant receptacles in business offices?
Answer: Referencing 406.12(5), only business offices in clinics, medical and dental offices, and outpatient facilities require tamper-resistant receptacles. This should not be applied in general to all business offices.
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