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Selk
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Single Core Cables - Above 95 sqmm

10/09/2019 5:44 AM

In a project, the specs says to use single core cables above 95 sqmm and up-to 95 sqmm, multi-core cables can be used.

The specs do not mention the advantages of using single core cables above 95 sqmm. If we go for single core cables, additional clamps, ladder size would get increase which would cause additional cost.

What are the advantages of using single core cables above 95sqmm?
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#1

Re: Single core Cables - above 95sqmm

10/09/2019 6:06 AM

Easier bending, for one thing.

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Randall
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#2

Re: Single core Cables - above 95sqmm

10/09/2019 6:38 AM

It might be better to phrase this question as the difference between solid and stranded rather than single core versus multicore: after all most domestic power cable are "multicore", three solid conductors in a single cable.

Solid core conductors are cheaper and more robust (resistant to corrosion and mechanical damage) than stranded.

If the cable doesn't need to flex once it's installed then why make it flexible, unless the ease of installation outweighs the other factors.

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#3

Re: Single Core Cables - Above 95 sqmm

10/09/2019 11:51 AM

I do not see how the use of single-core cables will increase cabling logistic demands. You will still need the same number of conductors regardless of them being single-core or multi-core. Because of the outer jacket, a multi-core cable can have a larger cross-sectional area than the sum of the single-core conductors.

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7anoter4
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#4

Re: Single Core Cables - Above 95 sqmm

10/09/2019 11:57 AM

I am sorry Randall, but this is not what o.p. asked. The cable about you are speaking is between 12 to 10 AWG but here it is about 4/0 awg and larger. In USA single core cable is recommended in order to facilitate an easier installation and in order to increase the ampacity [and to reduce so the conductor cross section area].In IEC World three ,four or five conductor cable is preferred: less reactance, current unbalance between parallel cable is minimum, no need clamps to support the cable against fault current force.

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#5

Re: Single Core Cables - Above 95 sqmm

10/09/2019 8:43 PM

Why would a spec give the advantages of one cable type over another?

For myself, after wrestling with 300mm² 3 core cables I’d go for singles every time.

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jhhassociates
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#6

Re: Single Core Cables - Above 95 sqmm

10/10/2019 3:21 AM

Single core 95mm2 cable weighs approximately about 1.2Kg/m. 3 core approx. 4.31Kg/m and 4 core approx. 5.39kg/m. Assuming a 100m cable run handling the 5 core means wrestling ½ tonne of semi rigid bar onto the cable tray. Any savings made by reduced number of clamps are more than lost in the additional manpower. 3,4 or 5 small clamps will not cost much more than 1 large clamp. At this size the cost increments between sizes is almost exponential. The bending radius of the larger cable would take up too much room and the intrusion into working space is likely to be unacceptable to the client. Finally, the specs. tell you what to use, so you are stuck with using what they say regardless of any cost considerations to you.
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7anoter4
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#8
In reply to #6

Re: Single Core Cables - Above 95 sqmm

10/14/2019 5:00 AM

I agree with you jhhassociates. However in a cable tray you may install all three cores together and draw them so mechanically -mainly if it is a solid bottom cable tray. In a ductbank all 40 m you have a manhole so the cable weight it is only 4.13*45=185 kg and it will be on the rolling drum most of the time. Also the 3 core cable is limited [usually] to 2*240 sqr.mm [ and aluminum might be easier, I suppose]

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#7

Re: Single Core Cables - Above 95 sqmm

10/10/2019 3:37 AM

One of the <...advantages...> is that the cost and time penalties of not doing it to specification are avoided.

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