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EICR C3 mixed manufacturer breakers

Martyn
I know this will have been discussed in the past but we are on Amd 1 of the 18th now so I thought I would renew it.


The Best practice guides list mixed manufacturer breakers in a consumer unit or distribution board as a C3.


As far as I am aware Bs7671 does not have a Reg on it beyond manufacturers instructions and given EICR's are based on this standard perhaps it is justified on that basis.


Most on here will be familiar with the 16kA 'rule' in BSEN61439 Annex ZB or its predecessor BSEN60439 Annex ZA


I avoid C3's like the plague because they give all the wrong signals to a client and clearly by definition are for things which are a breach of the regs, I'm not too keen on the insurance risk of a C3 either.


My question here would be what fault rating can one apply to an enclosure where there are mixed breakers given a manufacturer will only have certified their equipment with their devices?


Enjoy!


Martyn
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    Alan Capon:

    I would say it depends. If you are using Devices that have a higher breaking capacity than the supply PSSC, then C3. If the Devices have a lower breaking capacity than the supply PSSC, then you will be relying on the dispensation, and there could be justification for a C2.

     




    But what about the enclosure itself Alan? Clearly the devices have a certified kA rating and that is fairly easy to ascertain but the enclosures kA rating is manufacturer certified subject to use of their prescribed devices, what figure could we assume other than 0kA for an enclosure not intended for mixed devices?

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    Alan Capon:

    I would say it depends. If you are using Devices that have a higher breaking capacity than the supply PSSC, then C3. If the Devices have a lower breaking capacity than the supply PSSC, then you will be relying on the dispensation, and there could be justification for a C2.

     




    But what about the enclosure itself Alan? Clearly the devices have a certified kA rating and that is fairly easy to ascertain but the enclosures kA rating is manufacturer certified subject to use of their prescribed devices, what figure could we assume other than 0kA for an enclosure not intended for mixed devices?

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