Surely you only got a shock because there was a current path through you to earth somewhere - even if it was only through your feet/shoes...?
MW On 23 Jun 2013, at 03:40, Al wrote: > If you touch a battery terminal when the charger is on you will get shocked > whether you are touching the vehicle or not. Ask me how I know. > > Al > > > do not need to be touching the vehicle to get shocked > ----- Original Message ----- From: "tomw" <[email protected]> > To: <[email protected]> > Sent: Saturday, June 22, 2013 10:27 AM > Subject: Re: [EVDL] Isolated vs non-isolated [was 100ah pack on the cheap] > > >> "/On the Manzanita Micro charger, when I look at the AC plug, I see a >> grounding pin and 3 other blades. I assume that the unit is "grounded". On >> the recharging end, I see a small Anderson connector and a green wire which >> I assume is a grounding wire./ " >> >> The white neutral wire is clipped off and not connected to anything inside >> the charger. The charger enclosure is connected to the green ground wire. >> >> /"If the unit is grounded, what is the danger or dangerous act?/" >> >> You touching a battery terminal and vehicle chassis ground at the same time >> since the pack is at the potential of the AC outlet to which the charger is >> connected. I dropped a lead on a cell log8 datalogger when connecting it to >> my pack while charging with a PFC30. When it touched the grounded steel >> battery box it triggered the GFCI breaker in my subpanel, but the cell log 8 >> was destroyed (doesn't take much). Now I connect the cell log8 to cells >> THEN turn on the charger using the switch on the front of the charger. >> >> "...if the pack is being recharged and the case is attached to the car frame >> , what should I **not** touch? What can I touch and not be in danger?" >> >> As above, you can't touch both a battery terminal and chassis ground. You >> also cannot touch any exposed conductors connected to the input of the >> Regbus and ground simultaneously, as the Regbus also has AC on it while the >> charger is connected to AC. >> >> "If I can't touch the car, then that **is** very very dangerous." >> >> You can touch the car all you want, as long as you don't touch a battery >> terminal or connection to one at the same time. You also do not want to >> leave the pack or wiring with AC on it exposed while charging so someone >> else can touch it. This is not a problem if you have your batteries >> enclosed in boxes as I do, with no exposed conductors. Just remember the >> charger circuitry is at the potential (voltage) of the AC you have it >> connected to and the ground of the charger circuitry is connected to the >> charger enclosure which is usually bolted to the vehicle chassis. So if you >> connect yourself between the charger circuitry (via regbus or output) and >> chassis ground, you give AC a connection to ground through your body. >> >> "/If the charger is plugged in and **not** recharging, what is the danger?/" >> >> There is no AC on the plugged in charger circuitry unless the switch on the >> front is in the ON position. If it is ON, but not charging due to the >> current knob being turned all the way down, there is still AC on the charger >> circuitry and you can get a shock as described above. >> >> Some mount the charger with the enclosure isolated from vehicle chassis >> ground so there is no longer a path for AC current flow from the charger >> ground to chassis ground. >> >> >> >> -- >> View this message in context: >> http://electric-vehicle-discussion-list.413529.n4.nabble.com/100ah-pack-on-the-cheap-tp4663470p4663763.html >> Sent from the Electric Vehicle Discussion List mailing list archive at >> Nabble.com. >> _______________________________________________ >> 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) > _______________________________________________ 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)
