Discuss Best EV Charger without Earth Rod? in the Electrical Tools and Products area at ElectriciansForums.net

Midwest

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Esteemed
Arms
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essentially yes, there is a good video online from efixx / myenergi who make the zappi that explains how it monitors the voltage between conductors to determine if there is an open-pen fault. they had to present it to the iet to get approval.
I've read the zappi link and watched JW vid on the subject and both talk about the issue of monitoring the voltage, and the fact that an unbalance 3 phase load, that in some cases with a broken pen conductor the voltages won't be outside of the 207 -253. Then the that 70v, could be higher. Does the zappi have this sensing coil, similar to an RCD? This also seems to have its issues.
 

pc1966

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I think the Zappi has some sort of "3-pole RCD" to detect an earth fault current from MET to outdoors, probably as well as out-of-range voltage trip.

There was a video on it at some point, no real info, just saying how theirs is better than the TT/rod or Matt:E approaches.
 

Midwest

-
Esteemed
Arms
I think the Zappi has some sort of "3-pole RCD" to detect an earth fault current from MET to outdoors, probably as well as out-of-range voltage trip.

There was a video on it at some point, no real info, just saying how theirs is better than the TT/rod or Matt:E approaches.
From the JW vid I've watched, because a car is isolated from earth, this 'RCD' will only work when someone is stood on true earth touches the car metal work. I don't what the Zappi charger actually does, but they've applied for a patent, so are not saying much.

The Podpoint seems to use the same voltage monitoring system. But no mention of the 'RCD' device.
 

pc1966

Esteemed
Arms
Supporter
I don't what the Zappi charger actually does, but they've applied for a patent, so are not saying much.
Patents can be granted for near-trivial variations unfortunately.

I would be very surprised if it is anything revolutionary, most likely it is simply monitoring the CPC current (probably also another to check the live current imbalance) and tripping all live & CPC on a detected fault.

So an RCD by another name...or the VOELCB given a current-sensing makeover!
 

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