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testing cables

07/21/2008 7:36 AM

Hi

I tested 2 cables nym 3x2.5 seq mm

30amp for 1hour ambint temp 36

results

1st cable : pvc insulation temp 70c

2nd cable : pvc insulation temp 65c

whitch cable better

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Guru
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#1

Re: testing cables

07/21/2008 8:25 AM

<...which cable better...>

It depends upon the parameter being selected as to which one is 'better':

  • One of them is better than the other at dissipating heat.
  • One of them is better than the other at retaining it.

...though ambient conditions, the method of installation, etc., all have a bearing on the matter.

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#3
In reply to #1

Re: testing cables

07/24/2008 10:22 AM

thanks for your answer

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Power-User
Engineering Fields - Electrical Engineering - Ron Nombri Engineering Fields - Energy Engineering - Ron Nombri Engineering Fields - Power Engineering - Eternal Power Papua New Guinea - Member - Ron Nombri

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#2

Re: testing cables

07/22/2008 8:24 PM

In support of PWSlack's replay;

Try do an insulation test using a megger ohm meter on the two cables and see if there will be any slight difference in the insulation reading.

This may indicate which cable is possibly in weak insulation. Remenber to isolate and lock out_Tag Out the supply source first.

On the other hand, the selection of which cable to use will depend on the application and the environment to which the cable will be laid through.

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#4
In reply to #2

Re: testing cables

07/24/2008 10:22 AM

thanks for your answer

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Associate

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#5

Re: testing cables

07/24/2008 11:16 PM

hi

as u have tested both of the cables with keeping all the parameters identical,

2nd cable is better than 1st because for same ambient temperature, it dissipates more heat than 1st cable. which helps u to increase current by somewhat heigher than 30 ampeares so that its insulation reaches to 70° if it is safe.

regards

divyesh patel

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Users who posted comments:

Divyesh patel (1); Nidal (2); PWSlack (1); Ron Nombri (1)

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