Lee, "Internal" as in anything between the external interfaces. So yeah - in this case the wire that connects the J1772 coupler to the housing. Note that using steel cable and even getting somewhat close to the same resistance would make the cable several times heavier and stiffer, so much more difficult to handle. Steel has almost 9 times the resistance of copper, so a cable diameter 3 times that one of copper would be needed for the same resistance. However, since it is likely allowed to have (much) higher resistance as long as the temperature rise in the cable is similar, the thicker cable for the steel wire will also have more cooling surface, so it is allowed to have a higher resistance and produce more heat (slightly higher voltage drop). For example having only twice thicker cable instead of 3x would lead to approx twice the resistance and heat production, but since surface is also twice the area of the copper cable, the resulting temp rise is likely similar. Twice heavier and stiffer is probably still OK-ish to handle for the usual 6kW L2 cable, though it might already be cumbersome. There are ways t alleviate this though. Another approach is Alu wires, since Alu has only 60% higher resistance than copper.
Cor van de Water Chief Scientist Proxim Wireless Corporation http://www.proxim.com Email: cwa...@proxim.com Private: http://www.cvandewater.info Skype: cor_van_de_water Tel: +1 408 383 7626 -----Original Message----- From: Lee Hart [mailto:leeah...@earthlink.net] Sent: Monday, September 01, 2014 12:34 PM To: Cor van de Water; Electric Vehicle Discussion List Subject: Re: [EVDL] EVLN: Menacing Copper-Theives> A 'Cut & Steal'EVSEScourge From: Cor van de Water >Ehhh - the *internal* wiring of an EVSE, how can that be a standards >thing? >Who cares if the charging cable has copper, steel or aluminum wiring, as >long as it meets the current spec (and possibly the max resistance if >that is important (voltage drop)? Cor, perhaps you meant the *external* wire? In any case, I agree. The standards I'm familiar with (mainly UL and CSA) never specify the material that must be used; they only specify the properties that the material must have. I.e. wire must have a temperature rise of less than X deg.C at rated current (regardless of what material it's made of). So, I can't see any problems in principle with using a stranded steel cable for an EVSE, as long as the steel has enough cross sectional area to carry the current with an acceptable temperature rise and voltage drop. Be sure to prominently LABEL it "steel wire" in case the thieves can read. -- Excellence does not require perfection. -- Henry James -- Lee A. Hart http://www.sunrise-ev.com/controllers.htm now includes the GE EV-1 _______________________________________________ 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)
