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Achieving acceptable Zs on a final circuit.

geov

Sorry, brain fog….existing three phase final circuit protected by a 63a type c mcb. Zs is well in excess of the tabulated value. Is it acceptable practice to put a BS88 fuse after the mcb (next to the db) to increase the maximum permitted Zs?

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    The question is what is causing the high Zs? You need to understand this first. What is the Zs at the DB? What cable and how long?  I would not be surprised if the Zs at the DB is too high too, presumably its supply is a lot more than 63A?

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    The question is what is causing the high Zs? You need to understand this first. What is the Zs at the DB? What cable and how long?  I would not be surprised if the Zs at the DB is too high too, presumably its supply is a lot more than 63A?

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