Electrical-Level 3, Chapter 1

What is the decimal equivalent of ​square root of 3?

1.732

The general lighting load​ (expressed as a unit load per square​ foot) for a warehouse is​ _____.

1/4VA/sq ft

What is the​ current-carrying ampacity for each of 10 No. 10 THHN copper conductors installed in a single​ conduit?

20A

What is the minimum conductor ampacity for four​ 1,000W, 208V,​ 1Ø electric baseboard​ heaters?

24.04A

Branch circuit conductors supplying continuous duty loads are calculated at​ _____.

25% of the rated load

A continuous load is defined by the NEC​® as a load whose maximum current is expected to continue for at least​ _____.

3 hours

What is the total load for two small appliance branch circuits rated at​ 20A, 120V?

3,000VA

The voltage drop for a​ 208V, 1Ø circuit with a load of​ 26.5A, using No. 8 stranded copper conductors at a circuit length of 145

5.98V

The voltage drop for a​ 208V, 1Ø circuit with a load of​ 26.5A, using No. 8 stranded copper conductors at a circuit length of 145 is​ _____.

5.98V

What is the recommended maximum voltage drop in a​ three-phase branch circuit with a voltage supply of​ 208V?

6.24V

How many receptacles are required for 90 linear feet of show window​ area?

8

What is the demand load for one range with a nameplate rating of​ 10.8kW?

8kW

Which size copper branch circuit conductors are required to supply an air conditioning unit with a nameplate rating of​ 33.5A, 208V,​ 3Ø?

No. 6

The load for 6 of​ multi-outlet assembly used simultaneously is​ _____.

​1,080VA

What is the​ capacity, in​ amperes, for a 20A circuit breaker supplying a continuous​ load?

16A

What is the calculated load on a 120V branch circuit that is to supply twenty 60W incandescent​ fixtures?

10A

What is the calculated​ load, in​ amps, for a 120V circuit supplying four 150W recessed incandescent fixtures and six recessed fluorescent fixtures operating​ continuously? (Each fluorescent ballast is rated at​ 0.65A.)

11.125A

This question requires you to refer to the tables located in NEC Article 430. What is the motor full load current​ (FLA) for a​ 2hp, 230V,​ single-phase motor?

12A

How many receptacle outlets in a​ dentist's office can be connected to a​ 20A, single-phase 120V circuit if all of the outlets will supply noncontinuous​ loads? (Note: NEC Section​ 220.14(I) assigns a load of 180VA to each nonresidential​ outlet.)

13

What is the maximum number of​ general-purpose noncontinuous duty duplex receptacles that can be connected to a​ 20A, 120V circuit in a commercial​ building? What is the NEC​® required load rating for each​ receptacle?

13​ receptacles; 180VA

What is the maximum number of​ general-purpose noncontinuous duty duplex receptacles that can be connected to a​ 20A, 120V circuit in a commercial​ building? What is the NEC​® required load rating for each​ receptacle? At a​ minimum, a 60' long show window would need​ _____ receptacles.

13​ receptacles; 180VA

Using the resistance​ formula, the voltage drop for an​ 18A, 208V,​ 3Ø load with a total circuit length of 105 using No. 10 solid copper conductors is​ _____.

3.96V

The general lighting load for a store is​ _____.

3VA/sq ft

A continuous load has a maximum current of 25A. What is the minimum rating of the branch circuit that can be​ installed?

40A

What is the demand​ load, in​ amps, for one household electric range with a nameplate rating of​ 16.75kW, 1Ø,​ 240V?

41.67A

What is the demand​ load, in​ amps, for a single circuit supplying one​ wall-mounted oven rated​ 11.75kW, 1Ø,​ 240V, and a countertop cooking unit rated​ 9.6kW, 1Ø,​ 240V?

48.33A

At a​ minimum, a 60' long show window would need​ _____ receptacles.

5

The voltage drop for a​ 480V, 3Ø circuit with a load of​ 26.5A, using No. 8 stranded copper conductors at a circuit length of 145

5.18V

Load calculations for circuits supplying lighting units with ballasts are based upon​ _____.

the ampere ratings of the ballasts

The voltage drop between the point of service and the farthest outlet in a branch circuit should not exceed​ _____.

​3%

What is the total​ load, in​ VA, for two small appliance branch circuits in a​ single-family dwelling?

​3,000VA

A warehouse has​ 12,500 ft2 of floor area. What is the estimated general lighting load in​ VA?

​3,125

What is the​ load, after applying the appropriate demand​ factor, for six pieces of commercial kitchen equipment with a total VA rating of​ 54,000VA?

​35,100VA