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If you have a question regarding coaxial, telephone, and building wire, power cable, insulation, extrusion, bunching, stranding, braiding, etc. post it here.

TOPIC: lay loss and elongation in conductor

lay loss and elongation in conductor 1 year 7 months ago #2530

HI, to all
how to calculate the lay loss and elongation factor of 3 layer aluminium compact conductor
thanks
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Re: lay loss and elongation in conductor 1 year 7 months ago #2534

Assuming that you are a product design engineer in a wire and cable company:
Mathematically determining the extra length of conductor used on each of the two built-up layers is by the use the Pythagoras equation. It is that straightforward.

Most however use a standard percentage of excess on each built-up layer and then slowly cut that back until they have an acceptable minimum standard for all layers.

We are not sure what you mean by "elongation factor". Please give us more information on what you mean or are after.

Thank you.
Regards,
Peter J. Stewart-Hay Principal
Stewart-Hay Associates
www.Stewart-Hay.com
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Re: lay loss and elongation in conductor 1 year 6 months ago #2550

Mr. Sharma,
Peter has explained the lay-loss principle above, regarding your elongation factor the following things matter always, both in Al and Cu conductor.
1. How the conductor been compressed ( By dies or by Rollers)
2. The material of compacting dies.
3. What is the EAB% of wire at RBD for Cu?
4. What are the UTS for Al wire?
5. Then the % compaction level at each stage of conductor mean at 7 wire then 12 then 18 then 24 then 30 and further.

To reach on final conclusion you have to make the conductor at least once. Then cut the 1m sample and weight the wires in each layer separately and get the ratio with weight of un-compacted wires.

Always take care during production.
The Wire Elongation should meet the design elongation always or near.
Do not change lay-length of the conductor in any layer.
Whenever changing the dies replicate it from the same source or cross check the final sample once again.

For lay loss factor if you need calculation steps let me know.
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The following user(s) said Thank You: Mr raj sharma

Re: lay loss and elongation in conductor 1 year 6 months ago #2555

Dear Surinder ji,
Thanks for your help,
Please send me the calculation steps also.

Regards
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Re: lay loss and elongation in conductor 1 year 6 months ago #2556

Dear Peter,
Thanks for ur help
Regards
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