You are asked to install a water heater, rated at 3-kW, 240 V. Calculate the load in amperes, and determine the branch-circuit ampere rating.
What will be an ideal response?
Since, The Code® requires the water heater rating of not less than 125% :
amperes=(watts*1.25)/volts
amperes=(3,000*1.25)/240
amperes=3,750/240=15.6A
Therefore, the branch-circuit ampere rating should be 20A.
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