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Topic Title: Max Zs for 35A 1361 fuse
Topic Summary: Anyone?
Created On: 26 January 2010 08:18 PM
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 26 January 2010 08:18 PM
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stureid

Posts: 843
Joined: 28 November 2004

Hi folks

Just as the subject says really - does anyone know the max Zs for a BS1361 35A fuse? (It's in an old Wylex 1-way unit).

Unfortunately with fuses being non-linear I wouldn't have a clue how to start calculating it

Thanks in advance.

-------------------------
Regards
Stuart

http://www.redelectrical.co.uk
http://www.redrenewables.co.uk
 26 January 2010 08:55 PM
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Avatar for rocknroll.
rocknroll

Posts: 8824
Joined: 03 October 2005

1.92 @ 240V

1.84 @ 230V



Ref: Lawson Fuse Book!

regards

-------------------------
"Take nothing but a picture,
leave nothing but footprints!"
-------------------------
"Oh! The drama of it all."
-------------------------
"You can throw all the philosophy you like at the problem, but at the end of the day it's just basic electrical theory!"
-------------------------
 26 January 2010 08:56 PM
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stureid

Posts: 843
Joined: 28 November 2004

Much obliged!

-------------------------
Regards
Stuart

http://www.redelectrical.co.uk
http://www.redrenewables.co.uk
 26 January 2010 09:20 PM
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Inrush

Posts: 694
Joined: 19 December 2007

The old Wylex data I have tends to disagree

I have a max current of 262 and 158 Amps for disconnection times of 0.4 and 5 seconds respectively, giving:

Zs (0.4S 230V): 0.87 Ohms
Zs (5.0S 230V): 1.45 Ohms

Interestingly there is a note which states:

'Protective device ratings 10A, 35A, and 40A are not in BS 1361. They are manufactured to the same requirements but then tested and certified to BS 88.'
 06 January 2013 09:00 PM
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SherlockOhms

Posts: 320
Joined: 05 April 2011

Was there ever a definitive answer to this one?

I have a similar 35A 88-1 in an old switch fuse unit feeding a shower.
I'd like to have some accurate date to use to convince the customer to upgrade.

Any more info on this would be appreciated.

S.
 06 January 2013 09:51 PM
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leckie

Posts: 1682
Joined: 21 November 2008

Perhaps inrush's data is based on 80 percent value, that would ne in line with R&R's info. Shower will need to be at .4secs though.
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