What determines the maximum allowable ampacity for a service that is not established by code in Article 230?

The maximum allowable ampacity for a service that is not established by the National Electrical Code (NEC) Article 230 is determined by the rating of the service equipment used. This rating is crucial because it reflects the manufacturer’s defined capacity of the service equipment, including main circuit breakers, fuses, and other components that protect the electrical system.

When a service is installed, the equipment must be rated for the amount of current it will carry safely under expected operating conditions. Exceeding this rating can lead to overheating, equipment failure, or even fire hazards. Therefore, if the code does not specify an ampacity, the service's rating becomes the primary guideline, ensuring safety and compliance with both manufacturer specifications and the overall function of the electrical system.

Other factors, while they may influence the design and configuration of the electrical service, do not take precedence over the established ratings of equipment when it comes to determining ampacity.