Master Electrician Exam (NEC)Special Occupancies, Equipment, and ConditionsMedium
A master electrician is installing a new service for a recreational vehicle (RV) site in an RV park. The site requires a 50-ampere, 120/240-volt receptacle. According to NEC, what is the minimum continuous ampere rating required for the individual overcurrent protective device (OCPD) protecting this receptacle?
- A60 amperes
- B40 amperes
- C30 amperes
- D50 amperes
Show answer & explanationAnswer & explanation
Correct answer: D. 50 amperes
NEC Section 551.71(A) specifies that each recreational vehicle site equipped with a 50-ampere, 120/240-volt receptacle shall have an individual overcurrent protective device with a continuous ampere rating not less than 50 amperes. This ensures the OCPD matches the receptacle rating.
Why the other options are wrong
- A. 60 amperes would be an overcurrent device larger than the receptacle rating, which is generally not permitted for protection of the receptacle itself.
- B. 40 amperes is not a standard OCPD size for a 50A RV receptacle; the OCPD must match the receptacle rating.
- C. 30 amperes is for a 30A RV receptacle, not a 50A one.
RV Site 50A OCPD
The minimum continuous ampere rating for the overcurrent protective device required for a 50-ampere, 120/240-volt recreational vehicle site receptacle according to the NEC.
- OCPD must match receptacle rating.
- NEC Article 551 covers RV parks.
- Ensures proper protection for RV connection.
Memory trick: Fifty-amp RV, fifty-amp breaker, for safety's sake, no faker!