Chapter 3: Dwelling Load Calculation

Heating or A/C loads are calculated at _____ of the nameplate rating and the largest load is used (Standard Calculation)

100%

Standard Calculation: One-Family Dwelling; What is the general lighting and receptacle load (line and neutral) for a 2800 sq ft dwelling with two small appliance branch circuits and one laundry branch circuit?

6465VA

Standard Calculation: One-Family Dwelling; what is the fixed appliance load (line and neutral) for a dwelling with the following 120V loads supplied from the same feeder? Water heater - 5000VA Dishwasher - 1200VA Food waste dispenser - 1000VA Trash compactor - 900 VA Attic fan - 1200VA

6975VA

Standard Calculation: Multifamily dwelling; What is the general lighting load (line and neutral) for an eight-unit multifamily dwelling with one 20A laundry branch circuit and three 20A small appliance circuits in each 2000 sq ft unit?

72,750 VA

Four or more appliances that are fastened-in-place in a one family dwelling are calculated at _____ of the total load for all four appliances. (Standard Calculation)

75%

Less than four separately controlled electric space-heating units in a dwelling unit are calculated at _____% of their nameplate ratings (Optional Calculation)

75%

Standard Calculation: One-Family Dwelling; What is the range demand load (line and neutral) for one 17 kW household electric range?

13,500 VA

Each single or multiple receptacle on a stringle strap is calculated at _____ VA

180 VA

the demand load for household electric ranges rated in excess of _____ kW is calculated per table 220.55 (Standard Calculation)

1¾

Each dwelling shall be supplied with a(n) _____ A branch circuit to supply laundry receptacle outlet(s)

20 A

Optional Calculation: One-Family Dwelling; What is the total of the "general loads" for a 3000 sq ft dwelling with the following loads? 2 - small appliance 20A branch circuits 1 - Laundry 20A branch circuit 1 - 8kW electric range 1 - 1.2kW dishwasher 1 - 5kW clothes dryer 1 - 1800VA blower motor

24,000 VA

Feeders for several motors are calculated using the sum of the FLC tables of all motors plus _____% of the largest motor (Standard Calculation)

25

General lighting loads for dwelling units are calculated at _____ VA per square foot.

3 VA

After the minimum ampacity of the dwelling service has been calculated, Table _____ and 310.15(B)(7)(1) are used to determine the size of service-entrance conductors.

310.15(B)(16)

Standard Calculation: Multifamily dwelling; what is the total dryer load (line and neutral) for seven household dryers rated at 6.0 kW each?

32,250 VA

Standard Calculation: One-Family Dwelling; What is the range demand load (line and neutral) for three household electric ranges with nameplate ratings of 12 kW, 19 kW and 20 kW?

39,000 VA

a house (public) load is an electrical load which is metered separately and supplies common usage areas

True

a noncoinidental load is a load that is Not on at the same time as another load

True

Demand Factors may be applied to _____ of the six loads of the Standard Calculation.

4

The total load for household clothes dryers is calculated at _____ VA or the nameplate rating, whichever is higher

5000 VA

A(n) _____ is the amount of electricity required at a given time.

Demand

The Optional Calculation can be used to find the total ampacity of a multifamily dwelling with natural gas cooking equipment.

False

the maximum unbalance between any of the ungrounded conductors and the grounded conductors is described as _____

Feeder neutral load

The Optional Calculation for dwelling units consists of heating and A/C loads and _____ loads

General

For single-phase systems, the formula _____ is used to determine minimum ampacity of the ungrounded conductors.

I=VA/V

_____ outlet loads are calculated per the rules found in 430.22, 430.24 and 440.6

Motor

_____ loads are loads that are not on at the same time.

Noncoincidental

The total area of an occupancy is determined from the _____ dimensions of the building structure.

Outside