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    sandhu's Avatar
    sandhu Posts: 1, Reputation: 1
    New Member
    		  
    #1

    Jul 16, 2007, 10:47 PM
    Derating factor for cable
    Q. What is derating factor for cable laying when different size of cables are laid together?
    tkrussell's Avatar
    tkrussell Posts: 9,659, Reputation: 725
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    #2

    Jul 17, 2007, 02:54 AM
    Combining different size cables is not cause to derate. Derating is needed when the amount of current carrying conductors is greater than the ampacity of the standard 3 current carrying conductors will create more heat. Another reason to derate is if the wiring passes through an area with higher than normal ambient temperature.
    danar's Avatar
    danar Posts: 69, Reputation: 2
    Junior Member
    		  
    #3

    Jul 25, 2007, 11:09 PM
    Hi, sir tkrussel
    How about direct burial cables is deration applied if 4 cables(3C-300mmsq xlpe cu) are laid in one trench? What will be the suggested spacing and depth of the trench to attain minimum deration?
    Thanks.
    fathima123's Avatar
    fathima123 Posts: 3, Reputation: 1
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    #4

    Jan 9, 2010, 10:13 PM
    Ambient temperature is 60deg centigrade.What is flexible cable size I have to use for 63A breaker inside the Low voltage switchgearpanel having IP-65protection.
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