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UK diy (uk.d-i-y) For the discussion of all topics related to diy (do-it-yourself) in the UK. All levels of experience and proficency are welcome to join in to ask questions or offer solutions. |
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joining cores of multicore cable for beter ampacity
I want to use multicore cabel for domestic instalation ,but i dont
have 2,5 mm cable. But I have only 4 core by 1.5 mm. Can I join the cores 2 by 2 to reach a beter ampacity? And what MCB for this combination? The cable marker is - H05 V V - F |
#2
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joining cores of multicore cable for beter ampacity
In article .com,
"p" writes: I want to use multicore cabel for domestic instalation ,but i dont have 2,5 mm cable. But I have only 4 core by 1.5 mm. Can I join the cores 2 by 2 to reach a beter ampacity? Not viable. This would invoke the "conductors in parallel" part of the regs, and it just isn't viable in the scenario you describe as an alternative to buying the correct 2.5mm cable in the first place. -- Andrew Gabriel |
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joining cores of multicore cable for beter ampacity
But 1.5 mm by two is a 3mm. Isn"t this combination supposed to carry a
better load than a 2.5mm. Thank you! |
#4
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joining cores of multicore cable for beter ampacity
On 16 Nov 2005 00:05:36 -0800, "p" wrote:
But 1.5 mm by two is a 3mm. Isn"t this combination supposed to carry a better load than a 2.5mm. Thank you! Yes, but if you're determined to breach the wiring regulations why bother asking in the first place ? Andy |
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joining cores of multicore cable for beter ampacity
I'm asking because I dont have experience in that kind of work. I juist
want to know if it is possible to use it and how much load it is carryng. And whot ampacity of MCB to use for this. I juist want to ack someone with better experience than me. "" I want to use multicore cabel for domestic instalation ,but i dont have 2,5 mm cable. But I have only 4 core by 1.5 mm. Can I join the cores 2 by 2 to reach a beter ampacity? And what MCB for this combination? The cable marker is - H05 V V - F "" Thank you! |
#6
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joining cores of multicore cable for beter ampacity
"p" wrote in message oups.com... I want to use multicore cabel for domestic instalation ,but i dont have 2,5 mm cable. But I have only 4 core by 1.5 mm. Can I join the cores 2 by 2 to reach a beter ampacity? And what MCB for this combination? The cable marker is - H05 V V - F This reminds me of my impoverished days 20 years ago when I'd just bought my house and the interest rate was about 15 percent. I had been given a second hand shower - so I bought some bright orange 3 core 13 amp FLEX from J Bull Electrical - I was going to double it up ;-) A bit later I found some 10mm in a skip and hoarded that for "several" years. Fortunately I never actually got round to using either ...... |
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joining cores of multicore cable for beter ampacity
I'm asking because I dont have experience in that kind of work. I juist
want to know if it is possible to use it and how much load it is carryng. And whot ampacity of MCB to use for this. I juist want to ack someone with better experience than me. "" I want to use multicore cabel for domestic instalation ,but i dont have 2,5 mm cable. But I have only 4 core by 1.5 mm. Can I join the cores 2 by 2 to reach a beter ampacity? And what MCB for this combination? The cable marker is - H05 V V - F "" Thank you! |
#8
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joining cores of multicore cable for beter ampacity
In an earlier contribution to this discussion,
Andrew Gabriel wrote: In article .com, "p" writes: I want to use multicore cabel for domestic instalation ,but i dont have 2,5 mm cable. But I have only 4 core by 1.5 mm. Can I join the cores 2 by 2 to reach a beter ampacity? Not viable. This would invoke the "conductors in parallel" part of the regs, and it just isn't viable in the scenario you describe as an alternative to buying the correct 2.5mm cable in the first place. As a matter of interest, what's the rationale for banning this? It presumably would *work* - is it just that it may cause confusion to anyone working on it in future? -- Cheers, Set Square ______ Please reply to newsgroup. Reply address is invalid. |
#9
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joining cores of multicore cable for beter ampacity
I imagine one issue is current sharing between the conductors. Whilst
the current share may be close to 50/50 when installed, any slightly loose connection or corrosion of one conductor could cause one conductor to end up carrying most of the current. not good. |
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joining cores of multicore cable for beter ampacity
On 15 Nov 2005 23:37:37 -0800, "p" wrote:
I want to use multicore cabel for domestic instalation ,but i dont have 2,5 mm cable. But I have only 4 core by 1.5 mm. Can I join the cores 2 by 2 to reach a beter ampacity? And what MCB for this combination? The cable marker is - H05 V V - F In theory yes, but it is probably against regulations. sponix |
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joining cores of multicore cable for beter ampacity
Thanks! But anyone can tell me what kind of MCB I must use for this
cable? May be 32 Amps or lower rate? """ I want to use multicore cabel for domestic instalation ,but i dont have 2,5 mm cable. But I have only 4 core by 1.5 mm. Can I join the cores 2 by 2 to reach a beter ampacity? And what MCB for this combination? The cable marker is - H05 V V - F """ |
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joining cores of multicore cable for beter ampacity
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#13
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joining cores of multicore cable for beter ampacity
p wrote: But 1.5 mm by two is a 3mm. No. The measurement is the diameter of the core, but the current carrying capacity is related to the cross-sectional area. Two by 1.5mm has an area of 3.53 mm2 One by 2.5 has an area of 4.91 mm2. Isn't this combination supposed to carry a better load than a 2.5mm. No. You would need three 1.5mm cores to carry more than a 2.5mm core - and that assumes you can get all three cores to carry their fair share of current. That is a pretty poor assumption in the long run (which is almost certainly why parallel conductors are essentially banned in the regs). |
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joining cores of multicore cable for beter ampacity
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joining cores of multicore cable for beter ampacity
If doubling a cable diameter in this fashion is not Kosha then how come
a Ring Main is legal ? chris. |
#16
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joining cores of multicore cable for beter ampacity
In an earlier contribution to this discussion,
AJB wrote: In article .com, says... p wrote: But 1.5 mm by two is a 3mm. No. The measurement is the diameter of the core, but the current carrying capacity is related to the cross-sectional area. I think you're wrong. The measurement _is_ the cross-sectional area i.e 1.5mm^2 That is correct. A 2.5mm cable actually means a cross-section of 2.5 *square* mm - *not* a diameter of 2.5mm - so 2 x 1.5 *does* equal 3! [One might be forgiven for believing that a 2.5(sq)mm cable was 2.5mm in diameter because it's relatively close to that - at about 1.8mm. However, the difference is very obvious with larger cables. For example, a 10 (sq)mm cable has a diameter of only about 3.6mm.] -- Cheers, Set Square ______ Please reply to newsgroup. Reply address is invalid. |
#17
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joining cores of multicore cable for beter ampacity
On 16 Nov 2005 02:14:49 -0800 someone who may be "p"
wrote this:- I'm asking because I dont have experience in that kind of work. At least you are honest about that. I juist want to know if it is possible to use it It is possible to do most things, but not always advisable. Others have given reasons from the wiring regulations why your course of action is not advisable. I will give you another reason, you could set the building on fire. and how much load it is carryng. How much load a cable carries depends on the load attached to it. So far you have not said what the load is, or the type of circuit you are interested in. And whot ampacity of MCB to use for this. The rating of an MCB depends on the load and type of cable it is protecting (plus a few other things). I juist want to ack someone with better experience than me. Here is some advice. Don't try doing things with electricity, unless you thoroughly know what you are doing. You may well kill yourself, or someone else. -- David Hansen, Edinburgh I will *always* explain revoked encryption keys, unless RIP prevents me http://www.opsi.gov.uk/acts/acts2000/00023--e.htm#54 |
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joining cores of multicore cable for beter ampacity
On 16 Nov 2005 03:10:30 -0800, "p" wrote:
Thanks! But anyone can tell me what kind of MCB I must use for this cable? May be 32 Amps or lower rate? The way you keep on posting, we've switched from "could tell you" to "won't tell you". You are doing something that is forbidden, that is forbidden for good reason, and that is only "useful" as a sheer cheapskate measure. A major cause of electrical problems is people trying to save a little money like this. This is not a good thing and I doubt if anyone wants to encourage you in doing it. You're clearly going to do this anyway, but don't ask us to assist you. |
#19
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joining cores of multicore cable for beter ampacity
wrote: If doubling a cable diameter in this fashion is not Kosha then how come a Ring Main is legal ? 30A/32A ring circuit in 2.5mm^2 cable (or 1.5mm^2 MICC) is explicitly excluded from Conductors in Parallel regs. -- Andrew Gabriel |
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joining cores of multicore cable for beter ampacity
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#22
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joining cores of multicore cable for beter ampacity
In article .com,
p wrote: I want to use multicore cabel for domestic instalation ,but i dont have 2,5 mm cable. But I have only 4 core by 1.5 mm. Can I join the cores 2 by 2 to reach a beter ampacity? And what MCB for this combination? The cable marker is - H05 V V - F What country is this in? -- *I took an IQ test and the results were negative. Dave Plowman London SW To e-mail, change noise into sound. |
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Quote:
You have had good advice here but we can't stop you so it's your funeral. By the way a 100 metre reel of 2.5 mm T&E is about £15.00 so can't believe cost is an issue?? |
#24
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joining cores of multicore cable for beter ampacity
wrote in message oups.com... I imagine one issue is current sharing between the conductors. Whilst the current share may be close to 50/50 when installed, any slightly loose connection or corrosion of one conductor could cause one conductor to end up carrying most of the current. not good. Just like a ring main then. |
#25
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joining cores of multicore cable for beter ampacity
"Set Square" wrote in message
... In an earlier contribution to this discussion, AJB wrote: In article .com, says... p wrote: But 1.5 mm by two is a 3mm. No. The measurement is the diameter of the core, but the current carrying capacity is related to the cross-sectional area. I think you're wrong. The measurement _is_ the cross-sectional area i.e 1.5mm^2 That is correct. A 2.5mm cable actually means a cross-section of 2.5 *square* mm - *not* a diameter of 2.5mm - so 2 x 1.5 *does* equal 3! [One might be forgiven for believing that a 2.5(sq)mm cable was 2.5mm in diameter because it's relatively close to that - at about 1.8mm. However, the difference is very obvious with larger cables. For example, a 10 (sq)mm cable has a diameter of only about 3.6mm.] -- Cheers, Set Square Just pointing out that instead of typing 1.5mm^2 or 1.5(sq)mm you can type ² by holding down the Alt key while typing 253 on the number pad on the right of the keyboard like this: 1.5mm². 252 is cubed ³, 248 is degrees ° and 171 is ½. There's lots more. |
#26
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joining cores of multicore cable for beter ampacity
p wrote:
Thanks! But anyone can tell me what kind of MCB I must use for this cable? May be 32 Amps or lower rate? If you must do this against all sensible advice, then an MCB rating of 16A absolute maximum. -- Cheers, John. /================================================== ===============\ | Internode Ltd - http://www.internode.co.uk | |-----------------------------------------------------------------| | John Rumm - john(at)internode(dot)co(dot)uk | \================================================= ================/ |
#27
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joining cores of multicore cable for beter ampacity
"Peter Taylor" wrote in message ... Just pointing out that instead of typing 1.5mm^2 or 1.5(sq)mm you can type ² by holding down the Alt key while typing 253 on the number pad on the right of the keyboard like this: 1.5mm². 252 is cubed ³, 248 is degrees ° and 171 is ½. There's lots more. ooh I don't know ... I don't reckon you'd get away with that in some places - uk.misc for instance - strictly 7 bit, no smilies etc ! Thanks for the reminder - persuaded me to add "fr.rec.bricolage" to my subscribed groups :-) (é è ? ? ) |
#28
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joining cores of multicore cable for beter ampacity
"gentlegreen" wrote in message k... "Peter Taylor" wrote in message ... Just pointing out that instead of typing 1.5mm^2 or 1.5(sq)mm you can type ² by holding down the Alt key while typing 253 on the number pad on the right of the keyboard like this: 1.5mm². 252 is cubed ³, 248 is degrees ° and 171 is ½. There's lots more. ooh I don't know ... I don't reckon you'd get away with that in some places - uk.misc for instance - strictly 7 bit, no smilies etc ! Thanks for the reminder - persuaded me to add "fr.rec.bricolage" to my subscribed groups :-) (é è ? ? ) Mon plaisir, mon petit chou-chou! Not everybody knows about it though, do they? We all had to learn it at some stage. |
#29
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joining cores of multicore cable for beter ampacity
"John Rumm" wrote in message ... p wrote: Thanks! But anyone can tell me what kind of MCB I must use for this cable? May be 32 Amps or lower rate? If you must do this against all sensible advice, then an MCB rating of 16A absolute maximum. Not that this is wrong, but some of the messages on this thread are inviting this guy to frizzle himself. For all we know, he might be trying to get power to his 45A kiln in his shed 250 feet from the CU at the bottom of his garden. And I don't think he understands irony/sarcasm. The advice just has to be DON'T DO IT |
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joining cores of multicore cable for beter ampacity
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joining cores of multicore cable for beter ampacity
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#33
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joining cores of multicore cable for beter ampacity
On Thu, 17 Nov 2005 17:15:32 -0000, "Peter Taylor"
wrote: Not that I fully understand this, but I think these Alt-xxx characters are indeed part of the basic ASCII set. There are no "Alt -XX" characters, they're just characters. I use Alt-092 regularly for "\", just because this oddball Eunuchs keyboard doesn't have a key that every Windows box needs. For characters up to "¦" (Alt-127) then they're 7-bit ASCII characters and you'll find them on most keyboards. Other characters «© ½° é» etc. are 8-bit and are found in ANSI but not ASCII character sets. They'll work in almost all Usenet contexts (I don't think this is a _requirement_ for usenet, but in practice it's widely supported). Other character sets (UTF-8, ISO-8859-1 etc) that are different from ANSI will probably not work on usenet (there will be odd "broken" characters). They should work on the web if the server headers are configured correctly. Some (UTF-16) won't work for usenet at all. |
#35
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joining cores of multicore cable for beter ampacity
In uk.d-i-y, Peter Taylor wrote:
"Rob Morley" wrote in message news:MPG.1de615c336 ... In article , says... snip Just pointing out that instead of typing 1.5mm^2 or 1.5(sq)mm you can type ² by holding down the Alt key while typing 253 on the number pad on the right of the keyboard like this: 1.5mm². 252 is cubed ³, 248 is degrees ° and 171 is ?. There's lots more. |Usenet was originally a 7-bit medium, and 8-bit characters won't display |in software that expects text to be basic ASCII. There isn't a single |standard for an extension to the basic ASCII set anyway, so even if |software is 8-bit capable it won't necessarily display the character |that the author intended. Not that I fully understand this, but I think these Alt-xxx characters are indeed part of the basic ASCII set. It's just that there aren't enough keys on an English QWERTY keyboard to allot one key to every available character. Is that not right? Yes, that's not right. Type ASCII into Google to find out more. Here are the displayable characters of the basic ASCII character set: ! " # $ % & ' ( ) * + , - . / 0 1 2 3 4 5 6 7 8 9 : ; = ? @ A B C D E F G H I J K L M N O P Q R S T U V W X Y Z [ \ ] ^ _ ` a b c d e f g h i j k l m n o p q r s t u v w x y z { | } ~ The first character (above 0 and to the left of !) is the space character, which might or might be described as "displayable" :-) -- Mike Barnes |
#36
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joining cores of multicore cable for beter ampacity
"Bob Eager" wrote in message ... On Thu, 17 Nov 2005 17:15:32 UTC, "Peter Taylor" wrote: No. Basic ASCII uses codes between 0 and 127 decimal. And the codes between 0 and 31 are not 'visible'. IBM's extended ASCII puts printable characters in the 0-31 and 128-255 spaces. Any Alt-n code, where n is not between 32 and 127 (or 126, perhaps) is not part of basic ASCII. Thanks Bob & Andy. I just checked my binary basics and I was getting muddled between Standard and Extended, wasn't I. Happens too often these days! |
#37
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joining cores of multicore cable for beter ampacity
In article , Peter
Taylor wrote: "Rob Morley" wrote in message t... In article , ess says... snip Just pointing out that instead of typing 1.5mm^2 or 1.5(sq)mm you can type ² by holding down the Alt key while typing 253 on the number pad on the right of the keyboard like this: 1.5mm². 252 is cubed ³, 248 is degrees ° and 171 is ?. There's lots more. |Usenet was originally a 7-bit medium, and 8-bit characters won't display |in software that expects text to be basic ASCII. There isn't a single |standard for an extension to the basic ASCII set anyway, so even if |software is 8-bit capable it won't necessarily display the character that |the author intended. Not that I fully understand this, but I think these Alt-xxx characters are indeed part of the basic ASCII set. It's just that there aren't enough keys on an English QWERTY keyboard to allot one key to every available character. Is that not right? All characters are available using Alt-xxx but only a limited number of characters (as described in the paragraph above yours) are standard and so guaranteed to display the same on recipients screen as on sender's screen. -- John Cartmell john@ followed by finnybank.com 0845 006 8822 Qercus magazine FAX +44 (0)8700-519-527 www.finnybank.com Qercus - the best guide to RISC OS computing |
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