What is the maximum overcurrent protection allowed for a panelboard with an ampacity rating of 100 amps?

The maximum overcurrent protection for a panelboard is typically regulated to ensure that the amperage does not exceed the safe carrying capacity of the conductors and equipment. For a panelboard with an ampacity rating of 100 amps, the National Electrical Code (NEC) generally allows the overcurrent protection to be set at the panelboard's rated ampacity, which is 100 amps.

This means the circuit breaker or fuse protecting the panelboard should not exceed this rated capacity to prevent overheating and potential hazards. The option that specifies 100 amps aligns with this guideline, ensuring safety while also allowing the maximum allowable protection without exceeding the panelboard's capacity.

Lower protection levels, such as 80 amps, would not utilize the full capacity of the panelboard, while options exceeding 100 amps, such as 125 amps or 150 amps, would put the equipment and wiring at risk of overcurrent conditions. Therefore, selecting an overcurrent protection level of 100 amps adheres to the established standards and promotes safe electrical practices.