about perfect for a 30 amp RV!
Hi, A buck/boost autotransformer? https://www.larsonelectronics.com/product/223930/1-phase-buck-boost-step-up-transformer-113v-primary-120v-secondary-31-25-amps-50-60hz Add some surge protect...
Forum Discussion
Dutch_12078 wrote:westernrvparkowner wrote:
You can look up the proposed NEC changes for yourself. The NEC isn't some proxy for irate park owners. It carries the weight of law across the country since every jurisdiction I know of requires compliance to the NEC.
NEC Article 551.20(E) "Autotransformers. Autotransformers shall not be used."
That's been in the NEC since at least the early 80's. I haven't looked back any farther than that...
You need to look at the context for the quote. It's relating to systems where there are two separate supplies, in particular the 12V system and the 120V system. While it isn't as clear as one would hope, the whole section is dealing specifically with devices that connect to both systems, i.e. the converter (or an inverter, etc.). It seems to me what they're really trying to get at is the idea that a converter must have its DC output isolated electrically from its AC input, rather than having them somehow tied or bonded together, as an autotransformer inherently does.
This makes good sense; if an autotransformer were used in a converter, you'd end up with a neutral/ground fault by design in the RV, and also significantly increase the risk of a hot skin condition. on the RV.
