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Max Earth Fault loop impeadances for400A bs88 5 secs

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Discuss Max Earth Fault loop impeadances for400A bs88 5 secs in the Electrician Talk | All Countries area at ElectriciansForums.net

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mgbdanny

Hi their does anyone now were i can get maximum earth fault loop impedance for a BS88 400A fuse with a disconection time of 5 secs cheers danny
 
A book by Trevor E Marks published in 1999, A Hanbook for compliance has time curves for a 400A BS88 fuse.
400A 5 seconds = approx 3000A

Hot value
Zs = Uo/Ia = 230/3000 = 0•076ohms

Cold value
0•076 x 0•8 = 0•06ohms
 
Last edited by a moderator:
cheers guys ended up ringing the manufacturer of the fuse as recommended by the niceic which was cooper bussman and they quoted 0.9 ohms thanks for the reply that links spot on:D
 

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