50 amp RV service recepticle
I'm getting ready to put a 50 receptacle for our new (to us) 5th wheel. We have always had 30 amp 5th wheels before and just used a 20 amp adapters in the barn and watched what we ran. Today I bought ...
Forum Discussion
time2roll wrote:Dutch_12078 wrote:Doable and reasonably safe... and I also read it is not allowed by NEC as the connector should be NEMA 14-30 so as not to imply more power is available. NEMA 14-50 should be connected to 40 or 50 amp power. Only reason to go 40a would be if you had a bunch of #8 wire from another project. If spending money go #6 and 50 amp.
He means a normal 50 amp installation, but using a dual 30 amp breaker instead of a 50 amp breaker, allowing a smaller wire size. I agree the material savings would hardly be worth it, and would only recommend it when the service panel load capacity is a factor.
I believe the requirement for a single receptacle on a branch circuit is that the receptacle shall not have an ampere rating less than the circuit's rating. That doesn't mean it can't be higher rated than the branch circuit, so a single 50A receptacle on a dedicated 30A circuit is not forbidden.
For multiple receptacle circuits, the rules are different, and multiple 50A receptacles on a 30A circuit would not generally be permitted (but they would be okay on a 40A or 50A circuit). There are also different rules for certain special applications (e.g. welders).
