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Topic Title: BS1362 (Plug top type fuse) distribution boards
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Created On: 16 February 2010 01:24 PM
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 16 February 2010 01:24 PM
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tattyinengland

Posts: 786
Joined: 23 November 2006

Recently I've come accross two of these, one in domestic and one in commercial. BS7671 only give two sizes for max Zs. I think it is for a 3Amp and a 13Amp fuse. On the commercial job I've got an 8 way DB with 5 Amp fuses for the heaing system supplying fan coil units.

How common are these boards?
Do they still produce these boards?
If not, when did they stop producing them?
Any more info on Zs figures for diferent sizes of BS1362s?

Cheers all!
 16 February 2010 01:43 PM
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OMS

Posts: 19688
Joined: 23 March 2004

I believe that they would contain BS 1361 fuses -0 T/C curves and limiting Zs are published in the bumper fun book

BS 1362 are plugtop fuses - ie Specification for general purpose fuse links for domestic and similar purposes (primarily for use in plugs)

BS 1361 however - Specification for cartridge fuses for a.c. circuits in domestic and similar premises

Compare the difference

Regards

OMS

-------------------------
Failure is always an option
 16 February 2010 01:50 PM
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tattyinengland

Posts: 786
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Hi OMS

These are very definitly plug top size fuses in the fuse carriers,rated at 5 Amps; there are currently in both boards BS1362 fuses in them. Do you get 1361 fuses at 5 amps that are the same size as plug top fuses?

Edit, I'm due to be back on thursday with the mandate to make these butchered circuits safe and I'll gladly post pictures when I can get them.

Edit 2: By butchered, I mean that a spark has messed about with the wiring downstream of the fuse and this needs work done on it.(I don't mean that t5he job has been butchered by having this type of fuse board)
 16 February 2010 02:19 PM
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AdrianWint

Posts: 262
Joined: 25 May 2006

I agree with OMS.

They aren't plug top fuses. I agree, that they look very very similar, but if you look closely you'll find that they are actually a different size & a 5A plug top fuse will not fit in the carrier (unless they have been butchered!) the difference is only a matter of a couple of mm, but they are different.

Some consumer units in the 80's used cartridge fuses in 5A, 15A, 20A & 30A ratings, the cartridges got bigger as the rating increased to stop the domestic punter from fitting the wrong size link. The 5A link was hence made a slightly differnt size to the plug top 5A link, although I have seen many a fuse holder 'adjusted' to take the plug top variety. I think you have come across one of these fuseboards.

Every day is a school day!

Adrian
 16 February 2010 02:40 PM
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Avatar for OMS.
OMS

Posts: 19688
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Do you get 1361 fuses at 5 amps that are the same size as plug top fuses?


Yes you can get BS 1361 fuses in 5A - see Page 244 of the big red bumber book of fun

As for dimensions

BS 1362 Fuse dimensions:

Dia - 6.3mm +0mm, -0.025mm

Length - 25.4mm +0.8mm, -0.4mm

BS 1361 Fuse - 5Ampere

Dia - 6.35mm +/- 0.1mm

Length - 23mm +0mm, -0.08mm

Not much in it but they aren't actually the same size.

Regards

OMS

-------------------------
Failure is always an option

Edited: 16 February 2010 at 04:03 PM by OMS
 16 February 2010 03:04 PM
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spinlondon

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OMS, could you go over those dimensions again please?
 16 February 2010 03:50 PM
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OMS

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Well spotted Spin - I've edited the original post

OMS

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Failure is always an option
 16 February 2010 04:04 PM
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tattyinengland

Posts: 786
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Thank you all for the input. I'll get some 1361 fuses and replace them for the existing 1362 ones! There was even a 13A 1362 fuse in a 5A fuse carrier that certainly looked like it fitted the carrier. I'm due to look further into the job on Thursday, cheers.
 17 February 2010 12:58 PM
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Paul1966

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Originally posted by: AdrianWint
Some consumer units in the 80's used cartridge fuses in 5A, 15A, 20A & 30A ratings, the cartridges got bigger as the rating increased to stop the domestic punter from fitting the wrong size link.


Not just the 1980's. BS1361 fuses were already in use decades before then, and carriers for new panels are still available today.
 17 February 2010 03:14 PM
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AJJewsbury

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Do you get 1361 fuses at 5 amps that are the same size as plug top fuses?

I've seen BS 1362 fuses shoved into BS 1361 boards too - not that unusual (even in domestic).

and carriers for new panels are still available today

And sometimes how I wish they were more commonly used - they can actually discriminate with plug fuses, quite unlike these fangled mechanical MCBs.

- Andy.
 09 July 2014 02:59 PM
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westfield6

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Originally posted by: OMS




BS 1362 are plugtop fuses - ie Specification for general purpose fuse links for domestic and similar purposes (primarily for use in plugs)



No they are not. They are plug fuses. Plug tops (lids) don't have fuses.
 09 July 2014 03:19 PM
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Avatar for OMS.
OMS

Posts: 19688
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Originally posted by: westfield6

Originally posted by: OMS

BS 1362 are plugtop fuses - ie Specification for general purpose fuse links for domestic and similar purposes (primarily for use in plugs)



No they are not. They are plug fuses. Plug tops (lids) don't have fuses.


You must be pretty bored to have dug this up after 4 years ?

OMS

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Failure is always an option
 10 July 2014 01:26 PM
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Zoomup

Posts: 349
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Originally posted by: OMS

Do you get 1361 fuses at 5 amps that are the same size as plug top fuses?




Yes you can get BS 1361 fuses in 5A - see Page 244 of the big red bumber book of fun



As for dimensions



BS 1362 Fuse dimensions:



Dia - 6.3mm +0mm, -0.025mm



Length - 25.4mm +0.8mm, -0.4mm



BS 1361 Fuse - 5Ampere



Dia - 6.35mm +/- 0.1mm



Length - 23mm +0mm, -0.08mm



Not much in it but they aren't actually the same size.



Regards



OMS


BS 1362. Originally one inch long and a quarter of an inch dia. i.e. 25.4 X 6.3mm nowadays.

Regards,

Z.
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