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Topic Title: BS1361 time-current curves
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Created On: 02 November 2013 02:29 PM
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 02 November 2013 02:29 PM
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JZN

Posts: 562
Joined: 16 November 2006

Quick question. The fuses in the "KMF" type of switch fuse often found in domestics are BS1361 I think. The regs only carry current/time curves for MCBs, 3036 wire fuses and BS88. What curves do we use for a submain protected by a BS1361 fuse?

Thanks

Jon

PS there's another question on it's way depending on the answer to this!
 02 November 2013 02:32 PM
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JZN

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Just found one in the van as it happens. It's marked as IEC/EN60269.

Is that same as BS88?

John
 02 November 2013 04:30 PM
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John Peckham

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John

You need a copy of the 17th(RED) Edition Regs. book for 1361 time current curves and Zs values.

-------------------------
John Peckham

http://www.astutetechnicalservices.co.uk/
 02 November 2013 09:25 PM
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UKPN

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what size is your sub-main?

Regards
 03 November 2013 03:16 PM
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JZN

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It's a 5 metre run of 3-core 16mm armoured cable. It has a KMF switch next to the cut out. Cut out is labelled 100 Amp. I've not looked in the KMF yet but I'm assuming it is 80 Amp. Will take a proper look in a few days when I go back to do some work on the property.

Thanks
John
 04 November 2013 05:52 AM
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ssohnoherewego

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Amendment 1 of BS 7671:2008 contains some important changes concerning new fuse standards which took effect in March 2010. These changes can be seen in the maximum earth fault loop impedance (Zs) values in Tables 41.2 and 41.4. (Table 41.3 concerns circuit-breakers) The new fuse standards are:

BS 88-2 which has replaced BS 88-2.2 and BS 88-6.

BS 88-3 which has replaced BS 1361
 04 November 2013 10:26 PM
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UKPN

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max Zs for 80amp BS 1361 = 0.52 ohm.

Regards
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