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The minimum ampacity for a feeder supplying a dwelling unit is specified based on the National Electrical Code (NEC) requirements, which set standards for electrical installations to ensure safety and reliability. Typically, a minimum of 100 amps is required for single-family dwellings. This level of ampacity provides adequate capacity to support the electrical demands of modern homes, which may include appliances, HVAC systems, lighting, and other electrical loads.

Choosing 100 amps as the minimum ensures that there is enough power available to handle typical residential needs without risking overloading the system. Builders and electricians must consider current and future electrical demands when determining the necessary feeder size, and 100 amps is generally recognized as a standard baseline for residential service.

Other options, such as 50 amps, 75 amps, and 150 amps, do not meet the code requirements for standard dwelling units. While a 50 or 75 amp feeder may suffice for smaller and less power-intensive applications, they do not accommodate the average household's full electrical load. A 150 amp feeder, while providing more capacity, exceeds what is typically mandated for a standard dwelling unit, possibly leading to unnecessary costs without a corresponding need.