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Pvc V Xple
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<blockquote data-quote="Sidewinder" data-source="post: 388403" data-attributes="member: 9512"><p>Is it OK?</p><p></p><p>If you are thinking about rating it for 90 deg C then the devices at the terminations MUST also be 90 deg C rated.</p><p></p><p>Almost, all are not.</p><p></p><p>SO, whilst the tabulated CCC of XLPE is higher than PVC this is due to the increased operating temperature, which is actually wasteful anyway due to the increased Joule heating losses over the life of the cable.</p><p></p><p>However, you cannot rate XLPE @ 90 deg, thus utilise the higher CCC in the tables unless, you can guarantee that the termination temperatures will be acceptable to the connected devices.</p><p></p><p>Most "normal" B type MCB's encountered only have a 70 deg C rating.</p><p></p><p>Now PVC is rated according to the BGB @ 38A for a 6mm buried direct or in underground duct.</p><p></p><p>How much is not buried, if 18m is?</p><p></p><p>If the buried section dominates then it may not be OK regardless whether it is PVC or XLPE.</p><p></p><p>If it was predominantly on traywork, then it would probably be OK regardless of the cable type.</p></blockquote><p></p>
[QUOTE="Sidewinder, post: 388403, member: 9512"] Is it OK? If you are thinking about rating it for 90 deg C then the devices at the terminations MUST also be 90 deg C rated. Almost, all are not. SO, whilst the tabulated CCC of XLPE is higher than PVC this is due to the increased operating temperature, which is actually wasteful anyway due to the increased Joule heating losses over the life of the cable. However, you cannot rate XLPE @ 90 deg, thus utilise the higher CCC in the tables unless, you can guarantee that the termination temperatures will be acceptable to the connected devices. Most "normal" B type MCB's encountered only have a 70 deg C rating. Now PVC is rated according to the BGB @ 38A for a 6mm buried direct or in underground duct. How much is not buried, if 18m is? If the buried section dominates then it may not be OK regardless whether it is PVC or XLPE. If it was predominantly on traywork, then it would probably be OK regardless of the cable type. [/QUOTE]
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