spud1957 wrote:
WDP wrote:
enblethen wrote:
Most 30 amp rigs have a 30 amp main breaker in the rig.
Yes, there is fifty amps being supplied to the 10/3 shore power cord that is only rated for around 30 amps.
For the electrically challenged in this post, you don't SUPPLY 50 amps, you DRAW 30 amps, this limited by the main breaker in the TT.Perfectly acceptable and SAFE to use a 50 to 30amp adapter.
WDP
For those "electrically challenged", the 30 amp breaker in the converter is there to protect the load side of the converter, not the hot side of the converter. That is protected by the breaker at the outside post. The converter itself is capable, as a result of failure, of drawing more than 30 amps.
Section 14 of the Canadian Electrical Code basically says your circuit breaker needs to be sized based on the lowest rated element of the circuit. So if you are using an adapter or cord rated at 30A/125V you are required to use a 30 amp breaker.
Everything will work great until something fails. That's when you want to make sure everything is designed to code. Using an 30A adapter with a 50A breaker is not up to code in Canada. That is why the adapter states a 30A breaker is required!!!
Done.
S
I'm an EE and I don't quite understand your comments. Sure, a main breaker cannot exceed the rating of the panel it is in but by virtue of having a 30 amp breaker at the load end of a 30 amp shore power cord, it's not possible to draw more than 30 amps through it. I'm at a CG and not able to quote anything out of the CEC to show that is okay. You should note though, that the adapters all carry a CSA approval marking on them. If they weren't legal, I'm pretty sure there'd be no CSA approval on them.
If you ask an electrical inspector, you will also find that they do not concern themselves with anything that is plugged in via an extension cord or the cord itself - at least in Canada, unless something has changed recently.
