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    donf's Avatar
    donf Posts: 5,679, Reputation: 582
    Printers & Electronics Expert
    		  
    #1

    Aug 2, 2008, 08:25 AM
    Additional information wanted
    Referencing question https://www.askmehelpdesk.com/electr...kv-244455.html

    For my edification and any one else who might be interested. Are the calculations for Overhead versus lateral service planning the same? I believe that since the pots (transformers) are significantly different so would the power distribution planning.
    tkrussell's Avatar
    tkrussell Posts: 9,659, Reputation: 725
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    #2

    Aug 2, 2008, 12:20 PM
    What are you referring to? Voltage drop?
    donf's Avatar
    donf Posts: 5,679, Reputation: 582
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    #3

    Aug 2, 2008, 06:18 PM
    TK,

    No, I was wondering how much different Roges183's site plan would be if he went overhead versus lateral for residential or commercial Service Entry layouts.
    tkrussell's Avatar
    tkrussell Posts: 9,659, Reputation: 725
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    #4

    Aug 2, 2008, 06:52 PM
    Oh Ok. Only the conductors can be smaller in an overhead system, due to higher ampacity being in free air. The distribution equipment will be the same size/rating.

    See NEC Table 310.17, I think, for free air ampacities.

    The Handbook has some good info on buried conductor sizing, note the duct bank heating effect. Wire sizes get crazy.
    donf's Avatar
    donf Posts: 5,679, Reputation: 582
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    #5

    Aug 3, 2008, 05:41 AM
    Thanks.
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