Power connection
The thread about hot power cord got me thinking. My TT is 30amp service. If the site I have has a 50amp connection, I use a 50>30amp adaptor and use the 50amp. Is that what you do, or, do you just u...
Forum Discussion
Bumpyroad wrote:
does anybody see a potential problem with the 30 amp RV cord hooked to a 50 amp supply incase of short, excessive draw before the RV 30 amp breaker, etc.?
bumpy
If you are cutting firewood with a ax to close to the cord, or the lawnmowing crew runs over your cord, it will trip either the 50 or 30 amp cord equally fast.
The 30 amp breaker inside the RV will protect the #10 gauge cord from being overheated due to to many amps. #10 wire will not decompose at 32 amps, but rather is actually rated at 40 amps, however at that amperage will get rather warm, and the insulation can deterioate over time. Thus the NEC code requirement to have a maximum fuse size of 30 amps for #10 wire.
NEC does allow a "25 foot rule" where a conductor does not need to have fuse protection for it's size - IF there is overload protection within 25 feet of the time the wire size changes.
Thus a #10 wire can be connected to #000 wires protected at 150 amps safely, IF there is a overload protection within 25 feet of where the #10 wire is connected to the larger wire. The 30 amp circuit breaker that is factory installed in every 30 amp equippend RV is meeting that code requirement. (providing you are not using a 50' extension cord or something else is going on.).
Fred.
