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Logic problem in OSG - trivial

Ziggie
Page 79 OSG (blue edition)


Lcn is max fault current .......although the breaker may no longer be usable.

Lcs is max fault current .......can interupt safely without loss of performance.


.........


For domestic installations, the PFC is unlikely to exceed 6kA , up to which value the Lcn will equal Lcs.


usable , maybe usable, certainly usable?


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  • 0
    Generally we do not care if a device has to be replaced so long as users are not put at risk.

    In practice the two ratings may the same, for example a breaker may survive and be re-used a few times at 6kA but not disconnect reliably at the next common rating of 10kA, so both would be set to 6kA.


    Mike
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  • 0
    Generally we do not care if a device has to be replaced so long as users are not put at risk.

    In practice the two ratings may the same, for example a breaker may survive and be re-used a few times at 6kA but not disconnect reliably at the next common rating of 10kA, so both would be set to 6kA.


    Mike
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