“Piggyback” Circuit Breakers – U.S.
In an earlier post it was indicated that piggyback breakers, i.e. two breakers occupying the space of one breaker can only be installed in those panel boxes exhibiting an “A” and “B” per breaker number. Why is this? What’s the reasoning behind this? It’s not because they won’t function in a ‘normal’ box.
I was touring a house on the market and another party was quizzing the owner about the amp service and a chance peek inside the box revealed three such piggyback devices. The owner said that they were installed in 1983 and have worked fine. Why is the NEC against the devices and what is the NEC article number prohibiting their use.