what you are saying is correct if the branch circuits are tied in any way to the UNGROUNDED conductors . if they are not then you can go to a fused disconnect to a invertors to a ac distribution panel to the standby system remember the orginal post was not a interactive system !!! I belive this makes a difference
----- Original Message -----
From: Roland Wiench<mailto:
[email protected]>
To: Electric Vehicle Discussion List<mailto:
[email protected]>
Sent: Wednesday, October 10, 2007 12:57 PM
Subject: Re: [EVDL] Vehicle to Ground
The NEC article is 625-25. Loss of Primary Source.
Means shall be provided such that upon loss of voltage from the utility or
other electric systems, energy cannot be backfed through the electric
vehicle supply equipment to the premises wiring,
The electric vehicle shall not be permitted to serve as a standby power
supply.
To prevent this back feeding from the EV to the service entrance, the
battery charging equipment is design to prevent this from happening.
If you wanted to do this method of standby power, your charger input power
would have to come from a emergency power panel that we normally install
after a transfer switch than is then connected to a main service panel.
The emergency power panel only feeds those circuits that are design and
limit to the load of the standby power.
The transfer switch will have to be a automatic type, when you loss the
commercial power, it will auto switch the standby power to the emergency
power panels. You will not then get back feed into the commercial power.
The best way is to just plug in the correct size power cables into a onboard
inverter system that has all the safety features directly into the devices
you want keep running, by passing the service entrance.
Roland
----- Original Message -----
From: "Bob Rice" <
[email protected]<mailto:
[email protected]>>
To: "Electric Vehicle Discussion List" <
[email protected]<mailto:
[email protected]>>
Sent: Wednesday, October 10, 2007 11:12 AM
Subject: Re: [EVDL] Vehicle to Ground
>
> ----- Original Message -----
> From: "Frank John" <
[email protected]<mailto:
[email protected]>>
> To: "Electric Vehicle Discussion List" <
[email protected]<mailto:
[email protected]>>
> Sent: Wednesday, October 10, 2007 12:44 PM
> Subject: Re: [EVDL] Vehicle to Ground
>
>
> >
> > I think what Roland is describing is known as a "separately derived
> > system" and it is appropriate for neutral to be bonded to ground at the
> > generator. I'm rusty on my code but I seem to remember that an
> > alternative wiring scheme is available when the bond at the generator
> > doesn't
> > exist and neutral is shared with the mains circuit. Generator frame
> > grounding is probably
> > appropriate in either case.
> >
> > Bob Rice mentioned back-feeding and turning off the main breaker to
> > isolate the house circuits. I would strongly encourage folks NOT to do
> > this: breakers can "leak" current which can lead to interesting
> > experiences when the power comes back on. Don't ask me how I know....
> > install a properly rated transfer switch.
>
> Hi EVerybody;
> > Good point. But I never had any problems with the "isolated" house. I
> > just unplugger thd Jenny and turned on the main breaker to see IF the
> > Real
> > Power came back on. When it did, I was plesently surprised, as I never
> > knew WHEN it came back!
>
> > Roland, can you please provide the NEC reference that prohibits using an
> > EV to provide emergency power? I'd like to read that section.
>
> With powering houses AC Propulsion powered car inverter setup has this
> feature. You can provide meaningful amounts of power from yur T zero.Must
> be
> illegal SOMEWHERE? God forbid? I'm sure just running a 'stench chord out
> to
> my Jetta and just plugging it in in the driveway is illegal<g>!?
>
> Pluggin' Along
>
> Bob
>
>
> >
> > thanks
> >
> >
> >
> > ----- Original Message ----
> > From: Roland Wiench <
[email protected]<mailto:
[email protected]>>
> > To: Electric Vehicle Discussion List <
[email protected]<mailto:
[email protected]>>
> > Sent: Wednesday, October 10, 2007 11:44:15 AM
> > Subject: Re: [EVDL] Vehicle to Ground
> >
> >
> > Hello Bill,
> >
> > At the generator, the neutral and ground is normally connected
> > together. In
> > a generator installation, we are require to drive a three foot ground
> > rod
> > next to the generator and connect the generator ground to this.
> >
> > As for the EV in providing emergency power to a building, there is a
> > section
> > in the NEC, that it states, that a electric vehicle shall not be use
> > for
> > emergency power for a building.
> >
> > The reason for a standard EV not to be use as a emergency power source,
> > is
> > that there may be no phase lose protection, low voltage protection, and
> >
> > transfer switch devices as emergency generators have. You must also
> > have
> > mechanical protection for your feeder wires to a transfer switch that
> > is
> > than hard wire into your emergency panel. If you have equipment that
> > have
> > these safety equipment in it or you design this safety equipment and
> > submit
> > it to the state electrical board and then you set up a test and demo
> > with
> > all the instrumentation to prove it works safety for approvable, then
> > you
> > may get a exception to the NEC rules. This is how we can get some of
> > the
> > NEC exceptions or changes made.
> >
> > Roland
> >
> >
> > ----- Original Message -----
> > From: "Bill Dennis" <
[email protected]<mailto:
[email protected]>>
> > To: "Electric Vehicle Discussion List" <
[email protected]<mailto:
[email protected]>>
> > Sent: Wednesday, October 10, 2007 8:27 AM
> > Subject: [EVDL] Vehicle to Ground
> >
> >
> >> We have frequent power outages at our house, so a few years ago, I
> > wired
> >> up for receptacles that were totally separate from the house's main
> >> wiring system. During a power outage, I'd feed power from a portable
> >> generator into these receptacles with a generator, to keep the
> > house's
> >> heating system, refrigerator, TV and a few lights working. The
> >> generator sat on rubber feet, so was not connected to the ground.
> > Now,
> >> instead of a generator, I use the EV's traction pack, which again is
> > a
> >> floating ground. So my two questions are: do I need to tie the
> >> traction pack to ground when I'm using it this way, or is it okay to
> >> leave ground floating? And even more basically, have I broken any
> > NEC
> >> rules wiring the outlets this way?
> >>
> >> Bill Dennis
> >>
> >> _______________________________________________
> >> For subscription options, see
> >> http://lists.sjsu.edu/mailman/listinfo/ev<http://lists.sjsu.edu/mailman/listinfo/ev>
> >>
> >
> > _______________________________________________
> > For subscription options, see
> > http://lists.sjsu.edu/mailman/listinfo/ev<http://lists.sjsu.edu/mailman/listinfo/ev>
> >
> >
> >
> >
> >
> >
> >
> > ____________________________________________________________________________________
> > Need a vacation? Get great deals
> > to amazing places on Yahoo! Travel.
> > http://travel.yahoo.com/<http://travel.yahoo.com/>
> >
> > _______________________________________________
> > For subscription options, see
> > http://lists.sjsu.edu/mailman/listinfo/ev<http://lists.sjsu.edu/mailman/listinfo/ev>
> >
> >
> > --
> > Internal Virus Database is out-of-date.
> > Checked by AVG Free Edition.
> > Version: 7.5.488 / Virus Database: 269.13.28/1023 - Release Date:
> > 9/22/2007 1:27 PM
> >
> >
>
> _______________________________________________
> For subscription options, see
> http://lists.sjsu.edu/mailman/listinfo/ev<http://lists.sjsu.edu/mailman/listinfo/ev>
>
_______________________________________________
For subscription options, see
http://lists.sjsu.edu/mailman/listinfo/ev<http://lists.sjsu.edu/mailman/listinfo/ev>
_______________________________________________
For subscription options, see
http://lists.sjsu.edu/mailman/listinfo/ev