What determines the size of service conductors according to NEC Article 230?

The determination of the size of service conductors according to NEC Article 230 is based primarily on load calculations, which include demand factors. Load calculations take into account the total anticipated electrical load that the service conductors must support. This ensures that the conductors can safely carry the load without overheating or causing damage to the system. Demand factors consider that not all loads are used at full capacity simultaneously, allowing for efficient conductor sizing that meets the needs of the installation while adhering to safety standards.

Other factors like voltage rating, length of the conductor run, and type of insulation play roles in electrical installations, but they do not directly dictate the size of service conductors as comprehensively as load calculations. Understanding load requirements is crucial for ensuring that the electrical system operates safely and effectively, hence making it the primary consideration for conductor sizing.