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SPDs in domestic DBs - no OCPD required.

alanblaby

Following a few debates here, and in other places about whether over-current protection is required for SPDs, BEAMA issued a statement in January saying, extra OCPDs are not always required for SPDs. Full details in the link below. 

As an aside, I do check the BEAMA site semi-regularly, but didnt spot this one until I had an email from Dehn yesterday.

Beama SPD guidance

Parents

  • I wonder what the suppliers'/DNOs' position is on this. How often do SPDs go short circuit?

  • in reply to Chris Pearson

    How often do SPDs go short circuit?

    Even if they do, 99% of the time it should still be dealt with by the SPD's own internal protection - it's only in rare circumstances (akin to faults that exceed breaking capacity of MCBs) that the DNO's fuse would be called upon for backup protection.

       - Andy.

  • in reply to Chris Pearson

    Thanks Alan for posting this. I also first heard about it in the Dehn circular yesterday. One to slip between the pages of the brand new orange book which arrived yesterday?!

    Chris Pearson said:
    I wonder what the suppliers'/DNOs' position is on this.

    If the ENA are involved then assumedly the individual DNOs are okay with it?! Or at least a majority are.

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  • in reply to Chris Pearson

    Thanks Alan for posting this. I also first heard about it in the Dehn circular yesterday. One to slip between the pages of the brand new orange book which arrived yesterday?!

    Chris Pearson said:
    I wonder what the suppliers'/DNOs' position is on this.

    If the ENA are involved then assumedly the individual DNOs are okay with it?! Or at least a majority are.

Children
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