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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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    I was thinking of the cable. Domestically, unless you live right next door to the transformer, PSSC is unlikely to exceed 6 kA. In the industrial context, I was thinking that by the time that you have distributed through a main panel and so on down to a BS 61439 board, you may dropped below 6 kA or so.
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  • 0
    I was thinking of the cable. Domestically, unless you live right next door to the transformer, PSSC is unlikely to exceed 6 kA. In the industrial context, I was thinking that by the time that you have distributed through a main panel and so on down to a BS 61439 board, you may dropped below 6 kA or so.
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