Part $1$: Load Calculation, Single$-$Family Dwelling

When an electrician installs the wiring in a new building, he or she often needs to determine the service amperage. To accurately determine the service amperage, the electrician must be able to calculate all of the various loads associated with general lighting circuits, small$-$appliance branch circuits, and fixed$-$appliance circuits that supply ranges, dryers, and HVAC systems. The NEC has specific guidelines for performing these calculations.

In this exercise, you'll use the Standard Method to perform the load calculations for a one$-$family residence. As you work through this exercise, please write out all of your calculations. To receive credit for the questions, you must show exactly how you arrived at each solution. $($Use scrap paper for preliminary calculations, if you need to$.)$

Building Electrical Specifications

You'll be required to determine specific circuit loads, the minimum service, and related conductor sizes for a single$-$family home with the following electrical specifications:

Building Size: $3,800$ square feet $($exclusive of an unfinished basement not adaptable for future use, an unfinished attic, and open porches$)$

Small Appliance$-$Branch Circuits: $3$

Laundry$-$Branch Circuits: $1$

Fastened$-$in$-$Place Appliances:

Water heater $(28$kVA$)$

Dishwasher $(1,200$ VA$)$

Food Disposal $(1,200$ VA$)$

Attic Fans $(2)$ @ $750$ VA $(1,500$ VA total$)$

Clothes Dryer: $5$ kW

Ranges, Ovens, Cooktops: Range, $12$ kW

HVAC System: $3\mathrm{.}5-$ton AC system $240$ V$,17\mathrm{.}9$ A$,$ Air handler $3\mathrm{.}3$ A

Question $1$

Determine the total general lighting and receptacle load by calculating the general lighting load, the smallappliance branch circuit load, and the laundry branch circuit load. Apply any demand factor as applicable. Show your calculations in the word$-$processing document you created for your answers.

Question $2$

Determine the fixed$-$in$-$place appliance load. Show your calculations in the word$-$processing document you created for your answers.

Question $3$

Determine the line and the neutral load for the dryer circuit in this residence. Show your calculations in the word$-$processing document you created for your answers.

Question $4$

Determine the line and the neutral load for the range in this residence. Show your calculations in the wordprocessing document you created for your answers.

Question $5$

Determine the total AC load for the HVAC system in this residence. Show your calculations in the wordprocessing document you created for your answers.

Question $6$

Determine the largest motor load for this residence. Do not consider the AC unit as a motor load. Show your calculations in the word$-$processing document you created for your answers.

Question $7$

Based on your calculations for questions $1-6,$ determine the total demand in VA for this residence, the minimum service size, and the minimum conductor sizes $($THW$)$ for the ungrounded and grounding electrode conductors $($assume the neutral conductor to be the same as the ungrounded conductor$).$ Show your calculations in the wordprocessing document you created for your answers.