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The authority having jurisdiction (AHJ) is responsible for interpreting electrical code rules within a specific area. This entity can be a local building department, electrical inspector, or another designated authority that enforces building codes and safety regulations. The AHJ's role is crucial because they determine how the codes are applied in practice, including approval of plans, inspection of work, and ensuring compliance with safety standards.

By establishing guidelines and seeing that they are followed, the AHJ helps to safeguard public safety, ensuring that electrical installations meet prescribed safety standards. This authority is in the best position to understand both the specific code requirements and the local context, making their interpretations essential for compliance and enforcement.

While the building inspector may enforce the codes, and the electrical engineer may design systems in accordance with them, the ultimate decision-making authority lies with the AHJ. Similarly, the local fire department may have a role in overall safety but does not typically interpret electrical codes specifically.