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    Dwelling load calculation, water heater

    Ref: page 267 0f 2014 Elec. exam prep

    Examples calculate water heater at nameplate rating. NEC 422.13 states water heaters (120Gal. or less) shall be calculated as a continuous load (125%) Should the 4500W nameplate rating in the example be increased by 125%? Why or why not? Thanks!!

    #2
    WHs are calculated as continuous for branch circuit sizing, but not for feeder/service calculations.

    422.13 Storage-Type Water Heaters. A fixed storage type
    water heater that has a capacity of 450 L (120 gal) or
    less shall be considered a continuous load for the purposes
    of sizing branch circuits.
    [COLOR="blue"]"Electricity is really just organized lightning." George Carlin


    Derek[/COLOR]

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