Master Electrician Exam (NEC)Special Occupancies, Equipment, and ConditionsEasy
A master electrician is installing a new service for a recreational vehicle (RV) site in a campground. The RV site is intended for a large RV requiring a 50-amp, 120/240-volt supply. According to NEC Article 551, what is the minimum overcurrent protective device (OCPD) rating required for the individual RV site supply equipment?
- A60 amperes
- B50 amperes
- C30 amperes
- D100 amperes
Show answer & explanationAnswer & explanation
Correct answer: B. 50 amperes
NEC Article 551 specifies the minimum OCPD ratings for RV site supply equipment based on the type of connection. For a 50-amp, 120/240-volt supply, a 50-ampere OCPD is required.
Why the other options are wrong
- A. 60 amperes is not a standard minimum OCPD rating specified for RV site supplies of this type.
- C. 30 amperes is typically for 120-volt only or smaller RVs, not a 120/240-volt, 50-amp service.
- D. 100 amperes is excessive and not the minimum required for a 50-amp RV site supply.
RV Site OCPD Rating
The minimum overcurrent protective device (OCPD) rating for recreational vehicle (RV) site supply equipment is determined by the intended RV connection type and voltage, as specified in NEC Article 551.
- NEC Article 551 governs RV park wiring.
- Common RV connections are 20A, 30A (120V), and 50A (120/240V).
- OCPD rating must match or exceed the intended supply rating.
Memory trick: Rec Vee's Power Needs: Right OCPD, Right Voltage.