On 25 Dec 2016 at 13:03, Cor van de Water via EV wrote: > Even though the (cold-exposed) breaker might not trip, please remember the > purpose of the breaker is to protect the *wire* after the breaker from > overload.
The breaker is also intended to protect the receptacle and connected equipment. That's why a 30a recept is protected at 30a. It'a also the reason that plugs and receptacles are matched by rating: you can't plug a 50a plug into a 30a receptacle and vice versa. For example, if you could connect an appliance or EVSE with a 30a rated plug and cord to a receptacle protected by a 50a breaker, the breaker wouldn't protect the connected plug and cord properly. They could get hot and melt, causing a fire, even if the wiring to the receptacle remained cool and save and the breaker didn't trip. (I hope that's clear, I don't think I described it all that well.) The code makes an exception to this plug/receptacle matching requirement for circuits <= 20a. I assume this is because of the overall lower power available in those circuits, but I don't write the code. David Roden - Akron, Ohio, USA EVDL Administrator = = = = = = = = = = = = = = = = = = = = = = = = = = = = = EVDL Information: http://www.evdl.org/help/ = = = = = = = = = = = = = = = = = = = = = = = = = = = = = Note: mail sent to "evpost" and "etpost" addresses will not reach me. To send a private message, please obtain my email address from the webpage http://www.evdl.org/help/ . = = = = = = = = = = = = = = = = = = = = = = = = = = = = = _______________________________________________ UNSUBSCRIBE: http://www.evdl.org/help/index.html#usub http://lists.evdl.org/listinfo.cgi/ev-evdl.org Read EVAngel's EV News at http://evdl.org/evln/ Please discuss EV drag racing at NEDRA (http://groups.yahoo.com/group/NEDRA)
