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Topic Title: BS 1363 Plug top
Topic Summary: Max cable size
Created On: 09 May 2013 02:40 PM
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 09 May 2013 02:40 PM
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mpg

Posts: 14
Joined: 21 December 2006

Hello,

I was wondering what the general opinion is regarding max flex size for BS1363 plug tops.
Would anyone try 2.5mm 3 core flex?
In my opinion although the cores will fit the terminals and obviously the current carrying capacity of the cable is more than sufficient, the flex itself makes for a very tight fit and isn't good practice.

Thank you,

Marc.
 09 May 2013 03:25 PM
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Ricicle

Posts: 843
Joined: 23 October 2006

I have just this morning terminated a 3 core 2.5mm flex into a Duraplug plug. It's comfortable but no real problem. I don't think you could go any bigger. A lot depends on the moulding inside the plug as well as to the size of the cores you can dress in there.

-------------------------
Empty barrels make the most noise.
 09 May 2013 03:44 PM
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sparkingchip

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I think you will find the maximum conductor size is 1.5mm which happily carries in excess of the maximum load of a 13 amp plug top, so therefore you should not really being trying to get a 2.5mm into the plug top.

Andy
 09 May 2013 04:08 PM
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OMS

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Provision shall be made for the entry and effective clamping without bending of 2-core and 3-core flexible cords for rewirable plugs as given in Table 11, Table 12, Table 13, Table 26 and Table 27 of BS 6500:2000, having nominal conductor cross-sectional areas not exceeding 1.5 mm2.

extracted from BS 1363-1:1995 and A4:2012

regards

OMS

-------------------------
Failure is always an option
 09 May 2013 04:24 PM
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Ricicle

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Well that's new to me ! Are we suppose to own BS1363 and BS6500 now before wiring plugs ?

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 09 May 2013 04:46 PM
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AJJewsbury

Posts: 11540
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Are we suppose to own BS1363 and BS6500 now before wiring plugs ?

I think BSI would prefer you to own the complete set of all standards before you get out of bed - how do you expect to safely cross the room without a knowledge of BS 5229:1975 ?
- Andy.
 09 May 2013 04:51 PM
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sparkingchip

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Now then having trained as a electrician at the old Kidderminster college there was a carpet loom in the adjoining workshop, so we had all these standards in the library in the carpet section.

Our one electrical lecturer did his apprenticeship in Brintons carpet factory and spent every Friday afternoon hoovering fluff out of motors as part of his training.
 09 May 2013 04:58 PM
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OMS

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Originally posted by: Ricicle

Well that's new to me ! Are we suppose to own BS1363 and BS6500 now before wiring plugs ?


Nope - you just need to know that it's not designed to accept anything larger than 1.5mm2 x 3 core flex.

You can wire it in anything you like - I used to have a supply to a temporary shed that had a plug top on the end of a bit of 2.5mm2 T&E installed in a bit of spare wavin gas pipe under the lawn

regards

OMS

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Failure is always an option
 09 May 2013 05:02 PM
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OMS

Posts: 19733
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Originally posted by: sparkingchip

Now then having trained as a electrician at the old Kidderminster college there was a carpet loom in the adjoining workshop, so we had all these standards in the library in the carpet section.



Our one electrical lecturer did his apprenticeship in Brintons carpet factory and spent every Friday afternoon hoovering fluff out of motors as part of his training.


After fluff removal did he then engage with BS 7390:1990

regards

OMS

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 09 May 2013 05:06 PM
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WiredScience

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I've just spotted a 2.5 twin and earth stuffed into a BS1363 plug top, (power to the shed) while quoting for some work today, so the maximum capacity seems to be limited only by ones skills with a lasso....
 09 May 2013 05:09 PM
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sparkingchip

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"After fluff removal did he then engage with BS 7390:1990 "

Email my wife with a copy please.
 09 May 2013 05:13 PM
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mpg

Posts: 14
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Thanks for the replies!

I have today emailed MK technical dept and they also state the max size is 1.5mm for there BS1363 plug range.

Regards,

Marc.
 09 May 2013 05:50 PM
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OMS

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Originally posted by: WiredScience

I've just spotted a 2.5 twin and earth stuffed into a BS1363 plug top, (power to the shed) while quoting for some work today, so the maximum capacity seems to be limited only by ones skills with a lasso....


Sounds like my old pitch then - suprised that shed's still there though

Right, off to tarnish me spurs - so don't come the cowboy with me sonny Jim -

regards

OMS

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Failure is always an option
 09 May 2013 05:56 PM
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perspicacious

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"Well that's new to me ! Are we suppose to own BS1363 and BS6500 now before wiring plugs ?"

Fancy letting the PAT guys having one over on an electrician

CoP for In-service I&T of Electrical Equipment 15.10.1 covers the need to use BS EN 60309 plugs on 2.5 mm2.

Regards

BOD
 09 May 2013 06:01 PM
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alancapon

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In theory, a Portable Appliance Test on anything fitted with a 13A plug and anything larger than 1.5mm² cable is a fail.

Regards,

Alan.
 09 May 2013 06:14 PM
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Jaymack

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It's possible to fit 1.5²mm twin and earth into a 13A plug, such is the inginuity of the great unwashed. I've had this a few times!

Retards
 09 May 2013 06:19 PM
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rocknroll

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What about appliances that have a 2 core 2.5 cable either with a fitted or moulded plug from the manufacturers.

Does this not conform to the min cable diameter of 11mm and the fact that the plug is not overcrowded as it would be with 3 x 2.5's

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!"
-------------------------
 09 May 2013 06:41 PM
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perspicacious

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"What about appliances that have a 2 core 2.5 cable either with a fitted or moulded plug from the manufacturers."

These too appear to be excluded from the extract OMS posted.

The only time I've seen what appears to be 2.5 mm2 3c in a BS 1363 plug (that wasn't DIY) is on the modular bus bar under floor 6 m or so leads that terminate to a multiway IEC block. I can't quite see the need for 2.5 cable when they are fitted with a 13 A fuse (presumably rather than the 6 mm bolt option)

Regards

BOD

Provision shall be made for the entry and effective clamping without bending of 2-core and 3-core flexible cords for rewirable plugs as given in Table 11, Table 12, Table 13, Table 26 and Table 27 of BS 6500:2000, having nominal conductor cross-sectional areas not exceeding 1.5 mm2.

extracted from BS 1363-1:1995 and A4:2012
 09 May 2013 07:06 PM
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OMS

Posts: 19733
Joined: 23 March 2004

I'm pretty certain that the standard doesn't allow for conductors bigger than 1.5mm2 - both 2c and 3c in accordance with the tables listed above.

Just for fun, I rejected about 600 of those leads you describe BOD on the grounds that they were assembled from parts being outside of the product standard requirements.

It went around the houses for a few weeks until the client persuaded me to accept them - and no doubt caused a bit of consternation in the suppliers and manufacturers camps

No brainer really - you've supplied me kit that doesn't comply with the product standard - take it away and sent me kit that does. Once the client accepted it, it wasn't my drama - and my reservations over the derrogation were plain for all to see anyway

Regards

OMS

-------------------------
Failure is always an option
 09 May 2013 07:14 PM
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ebee

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"2 core AND 3 core" ?

Hmmmmmm

I would have thought 2 core OR 3core , not AND

Fancy putting two flexes onto the same plugtop!

Whatever next?



-------------------------
Regards,
Ebee (M I S P N)

Knotted cables cause Lumpy Lektrik
IET » Wiring and the regulations » BS 1363 Plug top

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