$458$

CHAPTER $19$ Special$-$Purpose Outlets$-$Water Pump, Water Heater

$5.$ An $80-$gallon electric water heater is energized for the first time. Approximately how many hours would it take to raise the water temperature $80F(26\mathrm{.}67C)($from $40F$ to to $12048[\mathrm{.}89C$

CHAPTER $19$ Special$-$Purpose Outlets$-$Water Pump, Water Heater

$459$

$(17)$ a$.$ If both elements of the water heater in this residence are energized at the same time, how much current will they draw? $($Assume the elements are rated at $240$ volts.$)$

b$.$ What size and Type THHN wire is required for the load of both elements? Show calculations.

$18.$ a$.$ How much power in watts would the two elements in problem $17$ use if connected to $220$ volts? Show calculations.

b$.$ What is the current draw at $220$ volts? Show calculations.