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flex or not flex . i am comflexed (Read 18783 times)
Goodsparks
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Re: flex or not flex . i am comflexed
Reply #17 - Sep 30th, 2008, 6:12pm
 
You could use ferrules, sockets with additional terminals, through crimps onto a solid / stranded cable, or if the run is as straightforward as you say, just replace the run with a more suitable cable.

Because flex isn't generally specified for installation use, you'll have trouble finding current ratings / volt drop ratings for the usual installation reference methods. (In trunking / insulating wall / clipped direct etc)

I think its one of those areas, as Lec says its not normal and doesn't 'feel' right so generally would be picked up as a deviation and classed as unsatisfactory.

Flex is ok for caravan wiring though i seem to remember  Wink

Paul
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wozzy
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Re: flex or not flex . i am comflexed
Reply #18 - Sep 30th, 2008, 11:09pm
 
using flex is obviously not good practice, but how can it be a 'fail out right' on a periodic? surely it would be a code 4? and therefore still satisfactory?
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All advice is at least two years out of date.
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Lectrician
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Re: flex or not flex . i am comflexed
Reply #19 - Oct 1st, 2008, 6:21am
 
I think that is the general concensus - It would be a code 4.
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Re: flex or not flex . i am comflexed
Reply #20 - Oct 1st, 2008, 8:47am
 
Quote:
...I have now spent a lot time trawling through the Regs and am hard put to find where it forbids the use of flexible cable for fixed circuits. To the contrary...

...Regs 17edition  (page 98) (521.9.1).  A flexible cable or flexible cord shall be used for fixed wiring only where the relevant provisions of the regulations are met.


Exactly.

And, because its use is NOT a deviation in itself, no recommendation code should be used (provided, of course, that it satisfies the requirements of the regs). It is incorrect to comment on preferences, myths and fables in a PIR; all observations must be supportable by one or more actual regulations.

You said, "as it was a flexible cable it was failed out right.". I would be interested to hear how your 'competent person' justified that assessment.

Quote:
I haven't found anywhere in the Regulations, Yet, that prohibits a stranded and a solid conductor in the same terminal.


And you won't.

But you should consider the requirements of Section 526, especially 526.1 and 526.2, items (ii), (iii) & (iv)
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supra59
Re: flex or not flex . i am comflexed
Reply #21 - Oct 13th, 2008, 8:13pm
 
so why not just solder the ends of the flex just a thought  Huh
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cosbycarl
Re: flex or not flex . i am comflexed
Reply #22 - Oct 13th, 2008, 8:38pm
 
Why not just twist the ends of the flex and double them over (use pliers to compress them a bit more too), also double the solid ends over and then you will have a nice tight fit!!

Thats what i do, when wiring boilers you have a mixture of flat twin and 5, 4, or 3 core flex, you wouldnt pull that up in a periodic? I know i wouldn't.
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Re: flex or not flex . i am comflexed
Reply #23 - Nov 23rd, 2008, 7:42pm
 
It concerns me that the author of the post considers a flexible cable more suitable than a 2.5mm 6242Y twin & earth cable for domestic fixed wiring, and that this has not been addressed.

Both flexible cables and solid or stranded twin & earth cables have there purposes in domestic situations, but should be used appropriately, and to the minimum size requirements of the regulations as already stated.
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cosbycarl
Re: flex or not flex . i am comflexed
Reply #24 - Dec 22nd, 2008, 10:18pm
 
I would like to add that i have read that flex cables have to be visible throughout their length, which is why its not suitable for domestic installations where wiring cables under floorboards etc... is common place.

When i read this, it reminded me of somebody actually telling me this quite a few years back now, when i asked the question as to why we didnt use it for rewires.
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Re: flex or not flex . i am comflexed
Reply #25 - Dec 23rd, 2008, 7:32am
 
Quote:
I would like to add that i have read that flex cables have to be visible throughout their length..


And I have to ask, Carl, where did you read that?




(You may have seen 413.3.4 and not realised that section 413 only applies to electrical separation.)
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Lectrician
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Re: flex or not flex . i am comflexed
Reply #26 - Dec 23rd, 2008, 7:36am
 
It has always been one of those things taught at college, and is no doubt in some books somewhere, but there is no mention of this specifically in the regs.  Not sure if there ever was.  I can remember being taught this at college though.

They also frowned heavily on clipping flex.  For example, the spur feeding a heater should be close enough and well situated for the flex to leave the spur and enter the heater without need to clip.
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Re: flex or not flex . i am comflexed
Reply #27 - Dec 23rd, 2008, 12:48pm
 
Thanks for the info Chubbs.

Good to see words accompanying the smilies Kiss

Perhaps it is Ding logged into your account  Grin

All the best  Smiley
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ChubbyPhaseWire
Re: flex or not flex . i am comflexed
Reply #28 - Dec 23rd, 2008, 12:54pm
 
Smiley
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Re: flex or not flex . i am comflexed
Reply #29 - Dec 23rd, 2008, 1:00pm
 
Thats more like it Tongue
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ChubbyPhaseWire
Re: flex or not flex . i am comflexed
Reply #30 - Dec 23rd, 2008, 1:02pm
 
Lectrician wrote on Dec 23rd, 2008, 12:48pm:
Thanks for the info Chubbs.

Good to see words accompanying the smilies Kiss

Perhaps it is Ding logged into your account  Grin

All the best  Smiley

Lips Sealed
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Re: flex or not flex . i am comflexed
Reply #31 - Dec 23rd, 2008, 5:48pm
 
Quote:
so why not just solder the ends of the flex just a thought  Huh


Mechanically it creates a potential fracture point at the junction of the soldered bit and the rest of the flex.
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Would all Third Party Apologists kindly mind their own business .....
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cosbycarl
Re: flex or not flex . i am comflexed
Reply #32 - Dec 23rd, 2008, 8:46pm
 
dingbat wrote on Dec 23rd, 2008, 7:32am:
And I have to ask, Carl, where did you read that?


I think you know the answer to that one ding, that crap book i recently purchased!

Grin

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cosbycarl
Re: flex or not flex . i am comflexed
Reply #33 - Jan 8th, 2009, 10:44pm
 
I found the reg where it states that a flex cable has to be visible along its length in case of mechanical damage, its reg 413.3.4 or page 57. Thing is though, its only if the circuit or install has the protective measure of electrical separation, so doesnt apply under normal conditions, but would if there was a shaver socket installed i suppose (or other methods of electrical separation)
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« Last Edit: Jan 8th, 2009, 10:45pm by cosbycarl »  
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