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Topic Title: XLPE
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Created On: 03 April 2013 07:47 PM
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 03 April 2013 07:47 PM
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mrcornbeef

Posts: 248
Joined: 05 December 2005

Just a quick one
when ordering SWA from wholesalers without giving them any spec ,is it likely most cables now xlpe and is it rated at 70 or 90 degrees
Thanks
 03 April 2013 10:09 PM
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hertzal123

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As far as I know its all XLPE these days and its rated at 90degC.
Regards,Hz.
 03 April 2013 11:08 PM
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jsa986

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Agreed XLPE 90 degrees

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Edited: 04 April 2013 at 10:43 AM by jsa986
 04 April 2013 09:39 AM
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perspicacious

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Have a read of the cautionary note 1 in Table 4E4A

Regards

BOD
 04 April 2013 10:39 AM
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AJJewsbury

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And indeed 134.1.4 and note b of table 52.1 of 523.1 - i.e. unless the terminals it is connected to are rated for 90 degrees, you're obliged to use the 70-degree ratings (at least in the vicinity of the terminations).
- Andy.
 04 April 2013 10:44 AM
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jsa986

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The op is asking what it comes "as standard" from wholesalers, not considerations for its applications.

Interesting points to consider though

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 04 April 2013 10:55 AM
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AJJewsbury

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The op is asking what it comes "as standard" from wholesalers, not considerations for its applications.

"just a little extra" from the forum
- Andy.
 04 April 2013 10:59 AM
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Legh

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I think its a case of buyer beware. Advice is given, as stated, in 4E4A as to how it should be used.
I suspect that the manufacturing costs are lower, cable CSA is smaller so XLPE is used rather than PVC.

Legh

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 04 April 2013 11:12 AM
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perspicacious

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"Interesting points to consider though"

Posted due to the number of times I've questioned the use of XLPE and the answer comes back from the contractor as his cable calculation software gives the use of XLPE being ok......

Typically, the software assumes that the contractor has read 512.1.5 and doesn't want to change the data input to 70 deg C.....

As an aside, has anyone ever received confirmation from a manufacturer that their equipment is suitable for use at a temperature exceeding 70 deg C at the equipment in normal service?

Regards

BOD
 04 April 2013 11:27 AM
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perspicacious

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It seems that nothing has changed in the last 7 years or so

Regards

BOD

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 04 April 2013 12:46 PM
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jsa986

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Originally posted by: AJJewsbury

The op is asking what it comes "as standard" from wholesalers, not considerations for its applications.


"just a little extra" from the forum

- Andy.


Agreed, something I hadn't considered in my reply and valid points, form both you and perspicacious

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 04 April 2013 12:52 PM
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OMS

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Perhaps the other point to consider is the actual CSA of steel armour in an XLPE cable is actually less than that in an equivalent sized PVC insulated cable

Not usually a problem, but one to be aware of in terms of calculating Zs - and certainly one to be mindful of if selecting a CPC in accordance with Table 54.7

Regards

OMS

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 04 April 2013 05:16 PM
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mrcornbeef

Posts: 248
Joined: 05 December 2005

Thank you for replies
much appreciated
IET » Wiring and the regulations » XLPE

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