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Discuss Which RCD to use for EV charging point? in the Electrical Forum area at ElectriciansForums.net

happyhippydad

happyhippydad

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I have found this one, but it is chint which I dislike:

I have also found this

but I am not sure if it is single phase. I never work with 3 phase so do not recognise if the RCD is for 3 phase (as it is rather wide!)
 
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plugsandsparks

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It needs to be 2 pole for SP same size as regular RCCB, you need 40A version and 30mA.

Basically an ordinary AC type rcd can get saturated by DC coming back from the car and thus it will not trip when it should.
 
Risteard

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I have found this one, but it is chint which I dislike:

I have also found this

but I am not sure if it is single phase. I never work with 3 phase so do not recognise if the RCD is for 3 phase (as it is rather wide!)
It's single phase. They used to do a three phase version with one phase wired through it but I think they got a single phase two pole version later. Either way it doesn't matter - it is configured for single phase. I haven't been able to beat them on price. (I have a trade account with them so pay less than the quoted prices also.)
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Incidentally I would remove the spare circuit breaker and blank it off. In spite of what it suggests it would be non-compliant to connect anything to the other circuit breaker as the RCD (which must interrupt all live conductors) must be dedicated solely to one EVSE and nothing else.
 
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plugsandsparks

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Gosh that is cheap, German engineering meets Chinese, I think the only Chint product i have bought is a 2P din mounted contactor...... Not sure i am ready to power the economy that had broken ours... lol
 
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ChrisElectrical88

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Is it the Tesla branded Charger? What earthing system is in the installation? Type A Double Pole 30mA RCD will be required, Type B are well expensive
 
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ChrisElectrical88

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Without 6mA DC leakage protection it has to be a Type B.
Type A RCBO will Give that protection?
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Just read the Manufacturing Instructions. Type A is fine for the Tesla Charger.
 
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pc1966

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Interesting. I've never come across an RCBO with Type B RCD characteristics - only RCCBs. Do you have a link to these devices?
I don't know if they are offered in the UK/ROI but this is what I remember seeing:
 
Risteard

Risteard

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Type A RCBO will Give that protection?
It won't. Excessive DC leakage could potentially disable a Type A RCD. The RCD wouldn't open if the leakage became excessive though. Therefore a Type B is required where there isn't equipment to prevent this.
 
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pc1966

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Could I ask why you've mentioned 3 phase supply @pc1966 ? My friends supply is single phase. Are the tesla chargers only compatible with 3 phase, I wouldn't have thought so?
I was thinking of thier fast charger, but I see they also do a 'normal' speed one as well.
 
Risteard

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