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Surge protection devices without overcurrent protection

Zs

Hello all, greetings from a desk day.

I am just off the phone with our genius SPD lady at SPD.  I mentioned the latest Fusebox distribution board which does not have an overcurrent device for the SPD.  The device is a Fusebox SPD1MT2 type 2 direct to busbar surge protection device.   She tells me that it is not compliant in accordance with section 524.4.5 and am inclined to agree.

www.fusebox.shop/.../spd1mt2

So, I installed one a week or so ago.  Purchased in good faith, and guilty of assuming an overcurrent device would be there,   I was a touch surprised when I saw no MCB for the SPD.

Their website states product description states 'with No MCB required'. 

I'm reading now that overcurrent can (in italics) be built into the device but my conversation with SPD hinted at some industry 'naughtiness'.  

Any views? Where do we stand with that then, in terms of compliance as installers?

thank you, 

Zs

Parents

  • Hi,

    I don't think Regulation 524.4.5 exists in the latest version of BS 7671, unless I'm mistaken?

    As per the datasheet below it looks like the SPD relies on upstream fuse protection (<=100A gG required).

    Kind regards, 

Reply

  • Hi,

    I don't think Regulation 524.4.5 exists in the latest version of BS 7671, unless I'm mistaken?

    As per the datasheet below it looks like the SPD relies on upstream fuse protection (<=100A gG required).

    Kind regards, 

Children
  • in reply to Bh

    Interesting. thank you for finding that.  It does say that, and it says its a Gg so  That must be the incomer?  So, I wonder if that regulation for 'overcurrent with respect to short-circuit currents is being met?  It does still exist in the brown book. And, I might stick my neck out and question as much as 100A protection in terms of disconnecting the device.

    I'm sure the manufacturer wouldn't have done anything untoward, but I'm designing for a TPN thatched residence right now and I must turn every stone.

    Zs

  • in reply to Bh
    Bh said:
    I don't think Regulation 524.4.5 exists in the latest version of BS 7671, unless I'm mistaken?

    No, but 534.4.5 does.

  • in reply to Chris Pearson

    Apologies, my typo.

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