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more aimed at securespark
I thank you, kind Sir!
more aimed at securespark
That's quite true.It's not really the refuelling system, but the vehicles - all that would be needed would be for the vehicle to be disabled when something was inserted into its filler pipe (very easy to implement), and vehicles are being 'designed from scratch' all the time.
I don't know, but I am as certain as I can be that it is more likely.I took his point to be that if such measures are (rightly or wrongly) deemed unnecessary with liquid fuel, they would probably also be (again, rightly or wrongly) deemed unnecessary with charging systems. ... unless, that is, you know that it is much more likely that people will 'drive off whilst plugged in' than to drive off with a fuel nozzle still inserted in their vehicle.
You may be right (particularly, as you suggest, in the early days before people become familiar with the charging process) - albeit there is a difference between "more likely and "much more likely". In any event, it seems that others agree with you, since we seem to be being told that most/all EVs do have an interlock (which, given how easy it is to implement, would seem a strange thing to omit).I don't know, but I am as certain as I can be that it is more likely.... unless, that is, you know that it is much more likely that people will 'drive off whilst plugged in' than to drive off with a fuel nozzle still inserted in their vehicle.
I feel sure that they really do mean 70V RMS. I agree that this is stated explicitly only once in the Amendment [in 722.411.4.1(ii)] but, throughout BS7671, it is assumed (quite probably stated somewhere), that when an AC voltage is mentioned, it means RMS voltage. I am not aware of anywhere in BS7671 where there is a reference to a peak AC voltage. The IET article mentioned early explains where the 70V figure comes from....I did at first look at the 70 volt max between earthing terminal and earth then realised 50 volt RMS = 70 volt peak but in some sections it not to exceed 70 volt and in others not exceed 70 volt RMS I wonder if this was an error?
Although we are used to seeing 50V as the maximimum permitted touch voltage, it appears that 50V may be rather conservative in terms of IEC 60479-5.The 70V touch voltage figure is taken from Table 2c (Ventricular fibrillation for alternating current 50/60Hz) of IEC 60479-5 (Ed. 1.0), Effects of current on human beings and livestock – Part 5: Touch voltage threshold values for physiological effects. This standard gives a value of 71V for both hands-to-feet, in water-wet conditions with medium contact area (12.2 cm2).
This was a Cougar
I can see a need for a vehicle like that to have to depart as a matter of urgency, so there'd be an interest in a system which facilitated that.Some ambulances have an auto eject function on charging leads.
I was going to ask if anybody knew what the experiences are in places where they use block heaters.My cousin in Canada forgot to unplug the lead to the sump heater and drove out of the garage with it still connected.
Like it just won't start if the charging lead is plugged in.
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