Two side-notes regarding Neutral wiring: 1. The J1772 plug or charger does not use Neutral at all, many chargers either do not have a Neutral wire connector (so, all you are left to do is to snip off the Neutral wire from the 4-wire cord when connecting up the charger, really not any difference from having a 10-50 outlet and a 3-wire cord, or you can do the following: 2. When I opened my electric dryer after swapping it for a natural gas heated dryer (to reduce electric load so more of my home charging falls into the baseline tariff) I noticed that the ground and Neutral wires were connected together inside the dryer. This was not a mis-wiring, as the factory wiring was designed to connect the ground and Neutral together. I was under the impression that nowhere in the electric system should ground and Neutral be bonded together, except at the service entrance. Yet, as long as the dryer was plugged in, it would provide that connection. Strange...
Indeed, the NEMA 10-30 (dryer) and 10-50 (stove) outlets had only ground and 2x phase, but appliances were running light loads between one phase and the ground. Clearly defeating the whole purpose of the ground wire... Cor van de Water Chief Scientist Proxim Wireless Corporation http://www.proxim.com Email: [email protected] Private: http://www.cvandewater.info Skype: cor_van_de_water Tel: +1 408 383 7626 -----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of EVDL Administrator Sent: Sunday, December 08, 2013 12:13 AM To: Electric Vehicle Discussion List Subject: Re: [EVDL] a nickel of my time On 7 Dec 2013 at 23:51, Cor van de Water wrote: > the 10-50 is 3-prong (240V only, no Neutral so no 120V) However, many, perhaps most, electric stoves DID use the combined ground and neutral for a 120 volt tap. This wasn't really very safe. I've read that this odd situation - a 3 wire feed to stove and electric clothes dryer receptacles, with neutral and ground combined - was permitted during the second world war in an effort to save copper. Dryers often drove the drum light from the 120v tap, and many times the motor too. Stoves used it for indicator lights, oven lights, and panel lights. The code allowing this wasn't changed until the late 20th century (I don't recall the exact date). Existing installations are grandfathered, but if you make any changes, code requires that you update to a 4-wire (separate neutral and ground) feed and 4-pin receptacle. But if you already have a 3-pin dryer, range, or welder receptacle in your garage, it's fine to charge your EV from one of these 3- pin receptaces as long as your charger is 240 volts only. As for whether I'd use it for charging I shared with the public - well, maybe not. But then with the legal situation what it is today, I might think twice about allowing strangers to charge on my property regardless. I know it sounds uncharitable, but I'd hate to get sued if somebody got shocked or injured using my 14-50 or whatever receptacle to charge his EV. 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 For EV drag racing discussion, please use NEDRA (http://groups.yahoo.com/group/NEDRA) _______________________________________________ UNSUBSCRIBE: http://www.evdl.org/help/index.html#usub http://lists.evdl.org/listinfo.cgi/ev-evdl.org For EV drag racing discussion, please use NEDRA (http://groups.yahoo.com/group/NEDRA)
