A residential property has a 100A main service. What is the minimum size of the overcurrent protection device required for a 20A branch circuit supplying a kitchen countertop outlet?

ICC E1 exam practice question · Services

A residential property has a 100A main service. What is the minimum size of the overcurrent protection device required for a 20A branch circuit supplying a kitchen countertop outlet?

A15A
20A
C25A
D30A

Exam tip

Always calculate the minimum overcurrent protection device size based on 125% of the circuit rating to ensure proper protection.

Why B is correct

According to 2023 NFPA 70 National Electrical Code (NEC) 210.11(B), the overcurrent protection device for a branch circuit must not be less than 125% of the circuit rating. For a 20A circuit, the minimum protection device size is 25A (125% of 20A).

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A residential property has a 100A main service. What is the minimum size of the overcurrent protection device required for a 20A branch circuit supplying a kitchen countertop outlet?

A residential property has a 100A main service. What is the minimum size of the overcurrent protection device required for a 20A branch circuit supplying a kitchen countertop outlet?

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