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Discuss Type C MCB needed for EV Charging? in the Electrical Forum area at ElectrciansForums.co.uk.

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  1. Marcus Vaughan
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    Marcus Vaughan Regular EF Member

    Location:
    Sheffield
    Hi all,

    I've not a lot of experience with EV but was called to a local job to investigate a loss of power to a 32amp 7.2KW EV charger.

    It turned out the 32A MCB (Type B) had failed, and would not even operate when completely removed from the board.

    I happened to have a matching Contactum B32 breaker (2nd hand) - so put that in to literally 'get them back on the road'.

    Anyhow - the customer then tells me he has been advised that the breaker should be a type C.

    I've not heard of this before, and the manufacturer was fairly non-committal "You can put in a type C if you want"

    Can anyone advise if EV chargers are susceptible to inrush due to the transformer?

    It's a Rolec EVHomecharge http://assets.rolecserv.com/files/p...547ae/WallPod EV Tethered Data Sheet - 02.pdf

    I wonder what other peoples experiences of this issue is?

    No problem with changing to a type C in terms of Max Zs etc.

    ...but not an easy part to replace if I am going to stick to the same manufacturer. Breaker on the left is what I have put in - but I can't find a contactum 7 series type C anywhere. I think I've got a 9 series though.

    upload_2019-4-13_9-41-3.png

    Installation details,
    TNS
    Ze=0.12 ohms
    circuit length is only a couple of meters in SWA - R1+R2 = 0.03 ohms
    40A 30mA RCCB at the charging point.
    No faults.

    The old MCB was of poor quality and nearly split in two with over - tightening. I think there has been frequent tripping and resetting.

    Thoughts? Type C standard practice for EV?

    Cheers.
     
  2. buzzlightyear
    Online

    buzzlightyear please let me back in to the prison cell. Electrician's Arms

    Location:
    star command
    Don't worry about buying the actual charging unit at this stage. To do the notification under your current scam membership, just add a new 32A circuit on a Type C MCB/RCBO at the DB and terminate to a rotary isolator next to where the charging point will go if & when you buy .
    that was posted about 45mins a go by a fellow spark .
     
  3. Marcus Vaughan
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    Marcus Vaughan Regular EF Member

    Location:
    Sheffield
    Just spotted that - cheers.
     
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  4. buzzlightyear
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    buzzlightyear please let me back in to the prison cell. Electrician's Arms

    Location:
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    Devon Chris why is that bad spelling, when I copied and paste it from the forum and from tony Michell?:mad::mad:
     
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  5. TonyMitchell
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    TonyMitchell Electrician's Arms

    Location:
    Berkshire, UK
    Buzz - probably because of "a go" vs. "ago" (a bit harsh) but academic as you deserve it anyway for spelling my name incorrectly above...:D
     
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  6. Gavin John Hyde
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    Gavin John Hyde Electrician's Arms

    Location:
    Somerset
    Business Name:
    Sulis Electrical Services Ltd
    The rolec ev chargers usually have a 40 amp type c rcbo in them for a 32 amp charge / 20 amp rcbo for a 16 amp charge load.
    When i discussed this on a training day they were non commital about the supply mcb. They did say with a short cable run there tech people found more nuisance tripping. With longer cable runs less so. But a type c is a safer bet. With the earlier rolec units it was rebadged chint and quality was iffy the newer ones are much better.
    Guess its a case of cable calcs and circuit design.
    Personally i would always install type c mcb. If i have to install an upfront type a rcd for the evbox elvi charger then i use a rolec rcbo with type a protection and 40amp type c to protect the charger as the internal dc monitoring in the charger doesnt on its own meet regs. Rolec only charge around 20 quid for these too which is a good price.
     
  7. Marcus Vaughan
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    Marcus Vaughan Regular EF Member

    Location:
    Sheffield
    Thanks for that detailed reply. Good information. It seems to make sense to go with a type C if I can find one, and the circuit is very short.
     
  8. buzzlightyear
    Online

    buzzlightyear please let me back in to the prison cell. Electrician's Arms

    Location:
    star command
    CONTACTUM MCB CPB RANGE ALL AMP TYPES SP Circuit Breaker C TYPE - *FREE P&P* FLIE BAY .
     
  9. Marcus Vaughan
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    Marcus Vaughan Regular EF Member

    Location:
    Sheffield
    Unfortunately I have asked Contactum if I can use their CP range in this board - and they said no - and recommended a board change!
     
  10. buzzlightyear
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    buzzlightyear please let me back in to the prison cell. Electrician's Arms

    Location:
    star command
  11. Devonchris
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    Devonchris Regular EF Member

    Location:
    Devon
    Business Name:
    O
    Sorry Buzz
    Must have caught that while scrolling on the phone. Now cancelled. I would never criticise your spelling, I love it.
     
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  12. Charlie_
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    Charlie_ Electrician's Arms

    Think we need some new icons, perhaps a sorry icon and a thank you icon would be useful
     
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  13. buzzlightyear
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    buzzlightyear please let me back in to the prison cell. Electrician's Arms

    Location:
    star command
    [​IMG]
    this will do .
     
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