Where must the service disconnecting means be installed relative to the point where service conductors enter the building?
Not quite. The answer is C: At a readily accessible location, either outside the building or nearest the point of entrance of the service conductors
230.70(A)(1) requires the service disconnect to sit at a readily accessible location, either outside the building or at the nearest point inside to where the service conductors enter — the goal is letting first responders and occupants kill power quickly, not burying the disconnect deep inside the structure.
Reference: NEC 2023 230.70(A)(1) (Service Disconnect Location)
Checked against multiple published sources
Two independent secondary sources agree on the requirement; neither is the code text. The ECM article is based on the 2011 NEC; the ExpertCE page cites the 2020 and 2023 editions without quoting them.
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