NEC ARTICLE CHANGES: 

 How they will affect you in 2020?

During the 2017 code cycle, changes in a general section of the code concerning ground fault protection were implemented. However, these changes were interpreted by many AHJ’s as applying to special occupancies such as Farm Buildings, RV’s and RV Parks. 
These changes would require ground fault protection on 30 and 50 amp RV circuits. 

A problem with this interpretation is:
That no manufacturer makes an RV pedestal with 30 or 50 amp Ground Fault protection. 
There are not any known instances of shock hazard which would have been prevented by ground fault protection on the 30 and 50 amp circuits. 

Some safety experts think requiring this protection would reduce overall safety because many people would take actions to prevent the spurious trips by bypassing the safety devices. 

The confusion caused by the differing interpretations has caused some AHJ’s to shut down RV Park construction for lack of compliance to the general standard (210.8(B)). 

Article 90.3 of the NEC provides that section 500 (Special Occupancies) “may supplement or modify the requirements” of the standard based on unique requirements of these special occupancies.

The panel also took steps to clarify the requirement that an RV can only be connected to one source of power. Meaning…
An RV cannot plug into the 50 amp, 30 amp and 20 amp (or any combination) to supply the RV’s electrical system.
Using the 20 amp receptacle for auxiliary loads exterior to the RV is not affected by this requirement. 
No RV is manufactured to use more than one power source. 
The addition of second power cords is an after-market process.

This clarification will help RV Park operators limit the use of more than one cord to an RV in their parks.

~ Wizard of Watts