To clear up and correct a few things - I was confusing the wiring that is there with other wiring that I recently inspected, because I saw the 277V phase voltage of the building lighting drop to 260V (due to the same 500ft of wire loop) and that was 12 AWG, but connected to a 20A breaker. The circuit that I am using to charge has a 30A breaker and 10 Awg wire, so that was confusion that I caused. Still, to see it drop from 211 to 197V (14V) is quite significant but unavoidable when the transformer and the building feed is at one side of the warehouse and the roll-up door where the 208V plus is located on the other side, over 200ft away. The reason that EVSE is advertising 40A is because it is a "portable" with a 14-50 plug and I have fabricated a conversion cable to a 14-50 outlet for that 30A circuit, so I need to set the charging vehicle to limit current until I have found how to get control of the setting in the EVSE and can change it to 24A when plugging into a 30A circuit like now. Most times I am charging with my Leaf, so there is no urgency to get this solved. Hope this clarifies, Cor.
On Fri, Sep 13, 2024 at 1:26 PM EV List Lackey via EV <ev@lists.evdl.org> wrote: > > On 13 Sep 2024 at 12:56, (-Phil-) via EV wrote: > > > You shouldn't be pulling more than 20A on #12 anyway > > For sure, and that only for short periods. Continuous loads shouldn't exceed > 16 amps (80% of maximum). > > Not to be too preachy here, but if you really have AWG 12, your wiring is > pretty seriously undersized - dangerously so, unless it's protected with a > fuse or breaker at 20a, which doesn't seem to be the case. > > For 40 amp protection, AWG 8 copper or AWG 6 aluminum would be the minimum. > > However, the NEC recommends (but I don't think requires) no more than 5% > total voltage drop from main panel to point of use. At 500', AWG 4 copper > will get you 6% voltage drop, and AWG 1 aluminum 5%. > > David Roden, EVDL moderator & general lackey > > To reach me, don't reply to this message; I won't get it. Use my > offlist address here : http://evdl.org/help/index.html#supt > > = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = > > How is the world ruled, and how do wars start? Diplomats > tell lies to journalists, and then believe what they read. > > -- Karl Kraus > = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = > > _______________________________________________ > Address messages to ev@lists.evdl.org > No other addresses in TO and CC fields > HELP: http://www.evdl.org/help/ > _______________________________________________ Address messages to ev@lists.evdl.org No other addresses in TO and CC fields HELP: http://www.evdl.org/help/
