Calculation Speed Drill Varied-1 ©Ted “Smitty” Smith 2011,2017

Click on the left mouse button to begin. Instructions This speed drill is designed to help you practice calculations. The slides will transition in three and one half minutes instead of two minutes. Attempt to answer the questions and then when the slide show completes, Check your answer. When you reach the end of the drill all of the slides will be repeated without the timer so you will have time to check and verify your answers at that time. Click on the left mouse button to begin.

What is the minimum sized THHN conductor that can be used for conductors between the controller and the motor of a part winding connected, 5 HP, single phase, 208 volt motor that has a nameplate rating of 23.9 amperes? All equipment has a 75 degree C temperature rating.

14 AWG

What is the demand on the main service entrance of an apartment complex that has a three phase, 480V service for 10 single phase, 208V ranges that have a nameplate rating of 14.2 kW?

37,950 VA

What size copper bonding jumper is required for the load side of a service if the service conductors are 4/0 copper and the main breaker is 200 amperes?

6 AWG

What is the maximum size inverse-time circuit breaker allowed for a 30 HP, three-phase, 208 volt, Design B motor for branch circuit, short circuit protection?

225 Amp

What is the demand on the main service entrance of a restaurant that has the following kitchen equipment? (3) Booster heaters for dishwashing equipment rated at 3.9 kW each (2) Deep fryers rated at 5.9 kW each (2) Electric grills rated at 11.2 kW each (1) Warming table rated at 2.9 kW

31.72 kVA

What is the minimum sized service that can be used for an office building that has a 480V, three phase service if the total calculated demand on the service is 798000 VA?

1000 Amp

What is the minimum circular mill rating for the feeder conductors that are run 100 ft from the service to an 84 amp calculated load supplied by 240 volt, three-wire system with a voltage drop of 3 percent applied? (CM is based on VD calculation)

30,100 CM

What size THWN copper conductors are required to supply a load on the secondary side of a transformer if the load is a continuous load of 50 amps and non-continuous load of 20 amps?

3 AWG

Calculate at continuous operation What is the load in VA for the following luminaires: 10-120 VA (each) recess luminaires 12-150 VA (each) incandescent luminaires 22-189 VA (each) electric discharge luminaires Calculate at continuous operation

8947.5 VA

What size copper grounding electrode conductor is required to a ground rod if the service conductors are rated 250 KCMIL copper?

6 AWG

What is the demand load in VA for 55-11 kW ranges installed in an apartment complex?

66,250 VA

What is the lighting load in VA for 140 ft of show window used at continuous operation?

35,000 VA

What is the general lighting load and receptacle load and small-appliance plus laundry load for 20-980 sq. ft dwelling units in a complex? (Calculate the load in VA)

51,150 VA

What is the demand load in VA for a range with a 16 kW rating?

9,600 VA

What is the load in VA for the general-purpose lighting load in a hotel or motel with 50 units of 420 sq. ft each?

18,800 VA

What is the demand on the main service entrance for 23- 4 What is the demand on the main service entrance for 23- 4.2 kW rated electric dryers?

40,250 VA

What is the load in VA for the general-purpose lighting load in a 2400 sq. ft beauty salon used continuously?

9,000 VA

What is the demand on the main service entrance in VA for a 11 kW range?

8,000 VA

What size THWN copper conductors are required to supply the secondary load of a transformer having a continuous load output of 212 amps? All terminations are rated at 90 degrees C.

300 kCMIL

What is the general lighting load and receptacle load and small-appliance plus laundry loads for a 3000 sq. Ft dwelling unit? (Calculate the load in VA)

6,675 VA

What is the maximum size nontime-delay fuse allowed for branch circuit, short circuit protection for a 40 HP, three-phase, 460 volt, Design B motor?

175 Amp

What is the demand on the main service of a dwelling unit for a 1 What is the demand on the main service of a dwelling unit for a 1.2 kW garbage disposal, a 3.2 kW water heater and a 2.1 kW dishwasher? None of the appliances are cord and plug connected.

6500 VA

What is the general lighting demand and receptacle demand and small-appliance plus laundry loads on the service entrance for a 6300 sq. ft dwelling unit? (Calculate the load in VA)

10,140 VA

What is the minimum volume allowance required in a plastic box for a duplex receptacle and (3) 14/2 NM cables?

12

What is the general lighting load and receptacle load and small-appliance plus laundry load for 15- 1280 sq. ft dwelling units in a complex? (Calculate the load in VA)

45,225 VA

What is minimum sized EMT which can be used for the installation of (4) 6 THHN, (3) 2 TW and (1) 12 THHN conductors?

1 ½ Inch

What is the general lighting demand and receptacle demand and small-appliance plus laundry in a multifamily dwelling unit with the following area? (Calculate the load in VA) 10-875 sq. ft dwelling units 10-920 sq. ft dwelling units 10-1050 sq. ft dwelling units

69,037.5 VA

What is the demand in VA for the general- purpose lighting load and core receptacle demand in a 7000 sq. ft office facility?

24,500 VA

What is the load in VA for a 208 volt, three- phase, 68 amp load operating for six hours and supplied by an individual branch circuit?

30,622 VA

What is the maximum size instantaneous trip breaker allowed for branch circuit, short circuit protection for a 20 HP, three-phase, 230 volt, Design A motor?

450 Amp

What is the minimum rating of an overload device required for a 5 horsepower, single phase, 208V motor with a marked service factor of 1.15 and a full load current of 22.6 amperes?

28.25 amps

What is the load in VA for the general-purpose lighting load in a 6800 sq. ft bank used continuously?

29,750 VA

What is the load in VA for the general- purpose lighting load in a school building with the following area: (Calculate at continuous operation) 20,000 sq. ft classroom area 5000 sq. ft auditorium area

81,250 VA

What is the minimum sized THHN conductor that can be used between the controller and the motor for a 15 HP, three phase, 208V, wye start, delta run connected motor that has a nameplate rating of 39.8 amperes, a marked service factor of 1.15 if all equipment is rated at 90 degrees C?

10 AWG

What is the demand load in VA for three pieces of cooking equipment with a 10 kW, 14 kW, and 16 kW rating installed in a dwelling unit?

15,400 VA

What is the demand load in VA and amps for 15, 208 volt, single phase cooking units rated 10 kW each on a three phase service?

37,500 VA

What is the minimum ampacity required for the secondary conductors of a transformer which are 23 feet in length when protected by a 300 amp overcurrent protection device on the primary side. The transformer has a 480 volt primary and 208 volt secondary?

230 Amps

What is the demand load in VA for a 5 kW dryer?

5000 VA

What size RHW copper conductors are required to supply a feeder with a continuous load of 172 amps and a non- continuous load of 80 amps? All terminations are rated at 90 degrees C.

350 kCMIL

What minimum sized SO cord which can be used to feed a 50 ampere, three phase, 208V load?

Size 5

What is the maximum sized time delay fuse allowed for branch circuit, short circuit protection of a 20 HP, three-phase, 208 volt, Design B motor?

110 Amp

What is the load in VA for the general- purpose lighting load in a 40,000 sq. ft store if 20,000 sq. ft is warehouse space? (Used at continuous operation)

81,250 VA

What is the load in VA for 50, 120 volt, lighting ballast rated at 1 What is the load in VA for 50, 120 volt, lighting ballast rated at 1.5 amps each and used for 8 hours a day?

11,250 VA

What is the demand load in VA for 10-3 kW cooktops and 10- 8 What is the demand load in VA for 10-3 kW cooktops and 10- 8.5 kW ovens installed in an apartment complex?

35,000 VA

What is the maximum sized time delay fuse which can be used to protect the feeder conductors for five, 10 HP, 480V three motors? Each motor has a name plate rating of 12.1 A, a marked service factor of 1.15, and they are design B. Each motor has a 20 Ampere time delay fuse branch circuit short circuit protection.

70 amps

What is the lighting load in VA for 140 ft of show window used at non- continuous operation?

28000 VA

A separate over load device shall be selected to trip at ____________ amperes for overload protection of a 7.5 HP, two phase, 230 V motor with a marked full load current of 13.6 amperes and a marked service factor of 1.15.

17 amps

What is the total current which can be carried by a 10 THHN aluminum conductor if it is installed in a conduit with a total of 8 current carrying conductors and the conduit is installed in an ambient temperature of 99 degrees F? All terminations will be rated at 90 degrees C.

22.3 Amps

What is the lighting load in VA for 100 ft of track lighting used at non-continuous operation?

7500 VA

What is the demand on the main service entrance for two cooktops with a 3 kW rating?

4500 VA

What size copper grounding electrode conductor is required to concrete encased electrode if the service conductors are four parallel runs of 500 KCMIL copper?

4 AWG

What is the lighting load in VA for the patient bedrooms in a 52,000 sq. ft hospital? Assume all loads will be used for 3 hours or more at a time.

13,500 VA

What is the demand on the main service entrance, in VA, for a 12 kW cooktop, 8 kW oven, and 4kW oven installed in a dwelling unit?

14,000 VA

What is the lighting load in VA for 15 continuous operated luminaires with a 75 VA ballast in each unit and 15 non-continuous operated luminaires with 75 VA in each unit?

2531.25 VA

What is the lighting load in VA for 50 continuous operated luminaires with a 150 VA ballast in each unit?

9375 VA

What is the general lighting demand including the receptacle load and small-appliance plus laundry demand in a multifamily dwelling unit with the following area? (Calculate the load in VA and round answer to nearest whole number) 5-1000 sq. ft dwelling units 5-1050 sq. ft dwelling units 5-1200 sq. ft dwelling units 5-1280 sq. ft dwelling units

53,438 VA

What size THWN copper conductors are required to supply the secondary side of a 480V to 208V, three phase transformer having a continuous load output of 194 amps? The transformer secondary conductors will not have overcurrent protection. They are 8 feet in length. The transformer primary conductors are protected by a 90 ampere inverse time circuit breaker. The secondary conductors terminate into a 200 A main breaker for a 208V three phase panel. The secondary conductors leave the transformer enclosure. All terminations are rated for 90 degrees C.

3/0 THWN

What is the voltage drop experienced on a 6 AWG aluminum conductor which is supplying a load of 23 amperes if the load is located 116 meters from the source of power? (Round answer to the nearest whole number)

14 Volts

What is the minimum sized THHN conductor which can be used to feed eight 5 HP, thee phase motors rated at 208V and 13.9 FLA, Design C and 1.15 service factor?

1/0 THHN

What is the primary line current of a 480 to 208 V three phase, delta-wye transformer if the secondary line current is 278 amperes? ( Assume 100% efficiency and round your answer to the nearest whole number.)

120 amps

What is the demand load in VA for five 10 kW and six 13 kW cooking units?

27,300 VA

What is the lighting load in VA for 203 ft What is the lighting load in VA for 203 ft. of track lighting used at continuous operation?

19,125 VA

What is the minimum sized THHN conductor which can be used to feed five arc welders. Each arc welder has a rating of 60 duty cycle and 28 amps I1eff.

1/0 THHN

What is the demand load in VA for 28-12 kW ranges installed in an apartment complex?

43,000 VA

What is the maximum sized inverse time circuit breaker which can be used to protect from overcurrent the RHW feeder conductors which are feeding four resistance welders which are rated at 30 duty cycle and 23 amperes? The feeders are 2 AWG aluminum.

300 amps

What is the load in VA for the general- purpose lighting load in a 8400 sq. ft church used continuously?

10,500 VA

What is the demand load in VA for 12-2 What is the demand load in VA for 12-2.5 kW ovens and a 12-3 kW cooktops installed in an apartment complex? ( Give your answer in kVA)

20.46 kVA

What is the load in VA for 150 ft of multioutlet assembly used to cord-and- plug connect loads that are used simultaneously?

27,000 VA

What is the minimum sized TW conductor which can be used to feed a 2 HP, single phase, 120V motor which is rated for 15 minute running and will be used for intermittent duty? The motor is rated at 21.8 FLA.

12 AWG

What is the ampacity of an XHHW aluminum, 8 AWG conductor installed in an ambient temperature of 102 degrees F? The conductor and all terminations are rated 90 degrees C.

39.5 amps

A 200 ampere, 208V single phase panel is installed for a single family dwelling. What is the minimum sized aluminum RHW conductor which can be used as a service entrance conductor?

4/0 RHW

What size copper grounding electrode conductor is required to a metal water main pipe if the service conductors are rated 350 KCMIL copper?

2 AWG

What is the demand load in VA for twenty five 15 kW ranges installed in an apartment complex?

46,000 VA

What is the maximum setting for the overload relay for a 30 HP, 480V, synchronous motor with a FLC of 26.1 amperes and a temperature rise of 40 degrees C? Assume the minimum setting has been tried and the motor will not start. Round your answer DOWN to the nearest whole number.)

36 amperes

What is the demand on the main service entrance of an apartment complex that has a single phase, 240V service for 31 dryers that have a nameplate rating of 4.3 KW? Copyright 2005 Ted "Smitty" Smith

48050 VA

What is the minimum required bending space required for four parallel runs of 250 kCMIL compact AA-8000 conductors if the conductors will enter the enclosure on the side opposite the termination lugs?

6.5 inches

A run of 4/0 THHN conductors will be ran vertically in a raceway A run of 4/0 THHN conductors will be ran vertically in a raceway. The total vertical length of the raceway is 376 feet. What is the minimum number of conductor supports that will need to be ordered for each conductor?

6

What is the demand load in VA for a 4 kW dryer?

5000 VA

What size copper equipment grounding conductor is required to ground to be ran with the ungrounded 4 THHN conductors feeding a piece of equipment which pulls a load of 18.2 amps. The conductors are fed by a 20 ampere circuit breaker? The ungrounded conductors in the circuit are size 4 THHN.

4 AWG

What is the fixed-appliance demand in VA for the ungrounded (phase) conductors with the following fastened in place appliances: 6000 VA water heater 1400 VA disposal 1050 VA compactor

8450 VA

What is the demand load in VA for 45 dryers rated at 6500 VA each?

73,125 VA

A recreational vehicle park will have ten 50A sites, fifteen 30A sites, ten 20A sites and five sites reserved for tent sites. What is the minimum demand on the main service entrance for all the sites?

38,130 VA

What is the minimum sized THHN conductor which can be used to feed a fixed storage type water heater rated at 100 gallons and 43.6 amperes?

6 AWG

What is the load in VA for 148 general- purpose duplex receptacles used to serve non- continuous operated loads in an office building?

36640 VA

What is the minimum number of 120V, 20 A circuits which can be used to feed 145 ft of multioutlet assembly used to cord-and-plug connect loads that are not used simultaneously? The assembly will have a duplex receptacle mounted every 12 inches.

3

What is the demand load in VA and amps for 15, 208 volt, single-phase cooking units rated 9 kW each?

30,000 VA

What is the demand in VA for a group of 208 volt, three-phase motors rated at 30 HP, 20 HP, and 10 HP? ( Assume these are the only motor loads on the service.) Round your answer to the nearest whole number.

69,035 VA

What minimum sized copper bonding jumper is required on the line side of a service if the service conductors are five parallel runs of 500 kCMIL copper?

350 kCMIL

Stop This is the end of the presentation. You can now review the slides and answers without the timer. Click the slide to advance to the next slide

What is the minimum sized THHN conductor that can be used for conductors between the controller and the motor of a part winding connected, 5 HP, single phase, 208 volt motor that has a nameplate rating of 23.9 amperes? All equipment has a 75 degree C temperature rating.

14 AWG

What is the demand on the main service entrance of an apartment complex that has a three phase, 480V service for 10 single phase, 208V ranges that have a nameplate rating of 14.2 kW?

37,950 VA

What size copper bonding jumper is required for the load side of a service if the service conductors are 4/0 copper and the main breaker is 200 amperes?

6 AWG

What is the maximum size inverse-time circuit breaker allowed for a 30 HP, three-phase, 208 volt, Design B motor for branch circuit, short circuit protection?

225 Amp

What is the demand on the main service entrance of a restaurant that has the following kitchen equipment? (3) Booster heaters for dishwashing equipment rated at 3.9 kW each (2) Deep fryers rated at 5.9 kW each (2) Electric grills rated at 11.2 kW each (1) Warming table rated at 2.9 kW

31.72 kVA

What is the minimum sized service that can be used for an office building that has a 480V, three phase service if the total calculated demand on the service is 798000 VA?

1000 Amp

What is the minimum circular mill rating for the feeder conductors that are run 100 ft from the service to an 84 amp calculated load supplied by 240 volt, three-wire system with a voltage drop of 3 percent applied? (CM is based on VD calculation)

30,100 CM

What size THWN copper conductors are required to supply a load on the secondary side of a transformer if the load is a continuous load of 50 amps and non-continuous load of 20 amps?

3 AWG

Calculate at continuous operation What is the load in VA for the following luminaires: 10-120 VA (each) recess luminaires 12-150 VA (each) incandescent luminaires 22-189 VA (each) electric discharge luminaires Calculate at continuous operation

8947.5 VA

What size copper grounding electrode conductor is required to a ground rod if the service conductors are rated 250 KCMIL copper?

6 AWG

What is the demand load in VA for 55-11 kW ranges installed in an apartment complex?

66,250 VA

What is the lighting load in VA for 140 ft of show window used at continuous operation?

35,000 VA

What is the general lighting load and receptacle load and small-appliance plus laundry load for 20-980 sq. ft dwelling units in a complex? (Calculate the load in VA)

51,150 VA

What is the demand load in VA for a range with a 16 kW rating?

9,600 VA

What is the load in VA for the general-purpose lighting load in a hotel or motel with 50 units of 420 sq. ft each?

18,800 VA

What is the demand on the main service entrance for 23- 4 What is the demand on the main service entrance for 23- 4.2 kW rated electric dryers?

40,250 VA

What is the load in VA for the general-purpose lighting load in a 2400 sq. ft beauty salon used continuously?

9,000 VA

What is the demand on the main service entrance in VA for a 11 kW range?

8,000 VA

What size THWN copper conductors are required to supply the secondary load of a transformer having a continuous load output of 212 amps? All terminations are rated at 90 degrees C.

300 kCMIL

What is the general lighting load and receptacle load and small-appliance plus laundry loads for a 3000 sq. Ft dwelling unit? (Calculate the load in VA)

6,675 VA

What is the maximum size nontime-delay fuse allowed for branch circuit, short circuit protection for a 40 HP, three-phase, 460 volt, Design B motor?

175 Amp

What is the demand on the main service of a dwelling unit for a 1 What is the demand on the main service of a dwelling unit for a 1.2 kW garbage disposal, a 3.2 kW water heater and a 2.1 kW dishwasher? None of the appliances are cord and plug connected.

6500 VA

What is the general lighting demand and receptacle demand and small-appliance plus laundry loads on the service entrance for a 6300 sq. ft dwelling unit? (Calculate the load in VA)

10,140 VA

What is the minimum volume allowance required in a plastic box for a duplex receptacle and (3) 14/2 NM cables?

12

What is the general lighting load and receptacle load and small-appliance plus laundry load for 15- 1280 sq. ft dwelling units in a complex? (Calculate the load in VA)

45,225 VA

What is minimum sized EMT which can be used for the installation of (4) 6 THHN, (3) 2 TW and (1) 12 THHN conductors?

1 ½ Inch

What is the general lighting demand and receptacle demand and small-appliance plus laundry in a multifamily dwelling unit with the following area? (Calculate the load in VA) 10-875 sq. ft dwelling units 10-920 sq. ft dwelling units 10-1050 sq. ft dwelling units

69,037.5 VA

What is the demand in VA for the general- purpose lighting load and core receptacle demand in a 7000 sq. ft office facility?

24,500 VA

What is the load in VA for a 208 volt, three- phase, 68 amp load operating for six hours and supplied by an individual branch circuit?

30,622 VA

What is the maximum size instantaneous trip breaker allowed for branch circuit, short circuit protection for a 20 HP, three-phase, 230 volt, Design A motor?

450 Amp

What is the minimum rating of an overload device required for a 5 horsepower, single phase, 208V motor with a marked service factor of 1.15 and a full load current of 22.6 amperes?

28.25 amps

What is the load in VA for the general-purpose lighting load in a 6800 sq. ft bank used continuously?

29,750 VA

What is the load in VA for the general- purpose lighting load in a school building with the following area: (Calculate at continuous operation) 20,000 sq. ft classroom area 5000 sq. ft auditorium area

81,250 VA

What is the minimum sized THHN conductor that can be used between the controller and the motor for a 15 HP, three phase, 208V, wye start, delta run connected motor that has a nameplate rating of 39.8 amperes, a marked service factor of 1.15 if all equipment is rated at 90 degrees C?

10 AWG

What is the demand load in VA for three pieces of cooking equipment with a 10 kW, 14 kW, and 16 kW rating installed in a dwelling unit?

15,400 VA

What is the demand load in VA and amps for 15, 208 volt, single phase cooking units rated 10 kW each on a three phase service?

37,500 VA

What is the minimum ampacity required for the secondary conductors of a transformer which are 23 feet in length when protected by a 300 amp overcurrent protection device on the primary side. The transformer has a 480 volt primary and 208 volt secondary?

230 Amps

What is the demand load in VA for a 5 kW dryer?

5000 VA

What size RHW copper conductors are required to supply a feeder with a continuous load of 172 amps and a non- continuous load of 80 amps? All terminations are rated at 90 degrees C.

350 kCMIL

What minimum sized SO cord which can be used to feed a 50 ampere, three phase, 208V load?

Size 5

What is the maximum sized time delay fuse allowed for branch circuit, short circuit protection of a 20 HP, three-phase, 208 volt, Design B motor?

110 Amp

What is the load in VA for the general- purpose lighting load in a 40,000 sq. ft store if 20,000 sq. ft is warehouse space? (Used at continuous operation)

81,250 VA

What is the load in VA for 50, 120 volt, lighting ballast rated at 1 What is the load in VA for 50, 120 volt, lighting ballast rated at 1.5 amps each and used for 8 hours a day?

11,250 VA

What is the demand load in VA for 10-3 kW cooktops and 10- 8 What is the demand load in VA for 10-3 kW cooktops and 10- 8.5 kW ovens installed in an apartment complex?

35,000 VA

What is the maximum sized time delay fuse which can be used to protect the feeder conductors for five, 10 HP, 480V three motors? Each motor has a name plate rating of 12.1 A, a marked service factor of 1.15, and they are design B. Each motor has a 20 Ampere time delay fuse branch circuit short circuit protection.

70 amps

What is the lighting load in VA for 140 ft of show window used at non- continuous operation?

28000 VA

A separate over load device shall be selected to trip at ____________ amperes for overload protection of a 7.5 HP, two phase, 230 V motor with a marked full load current of 13.6 amperes and a marked service factor of 1.15.

17 amps

What is the total current which can be carried by a 10 THHN aluminum conductor if it is installed in a conduit with a total of 8 current carrying conductors and the conduit is installed in an ambient temperature of 99 degrees F? All terminations will be rated at 90 degrees C.

22.3 Amps

What is the lighting load in VA for 100 ft of track lighting used at non-continuous operation?

7500 VA

What is the demand on the main service entrance for two cooktops with a 3 kW rating?

4500 VA

What size copper grounding electrode conductor is required to concrete encased electrode if the service conductors are four parallel runs of 500 KCMIL copper?

4 AWG

What is the lighting load in VA for the patient bedrooms in a 52,000 sq. ft hospital? Assume all loads will be used for 3 hours or more at a time.

13,500 VA

What is the demand on the main service entrance, in VA, for a 12 kW cooktop, 8 kW oven, and 4kW oven installed in a dwelling unit?

14,000 VA

What is the lighting load in VA for 15 continuous operated luminaires with a 75 VA ballast in each unit and 15 non-continuous operated luminaires with 75 VA in each unit?

2531.25 VA

What is the lighting load in VA for 50 continuous operated luminaires with a 150 VA ballast in each unit?

9375 VA

What is the general lighting demand including the receptacle load and small-appliance plus laundry demand in a multifamily dwelling unit with the following area? (Calculate the load in VA and round answer to nearest whole number) 5-1000 sq. ft dwelling units 5-1050 sq. ft dwelling units 5-1200 sq. ft dwelling units 5-1280 sq. ft dwelling units

53,438 VA

What size THWN copper conductors are required to supply the secondary side of a 480V to 208V, three phase transformer having a continuous load output of 194 amps? The transformer secondary conductors will not have overcurrent protection. They are 8 feet in length. The transformer primary conductors are protected by a 90 ampere inverse time circuit breaker. The secondary conductors terminate into a 200 A main breaker for a 208V three phase panel. The secondary conductors leave the transformer enclosure. All terminations are rated for 90 degrees C.

3/0 THWN

What is the voltage drop experienced on a 6 AWG aluminum conductor which is supplying a load of 23 amperes if the load is located 116 meters from the source of power? (Round answer to the nearest whole number)

14 Volts

What is the minimum sized THHN conductor which can be used to feed eight 5 HP, thee phase motors rated at 208V and 13.9 FLA, Design C and 1.15 service factor?

1/0 THHN

What is the primary line current of a 480 to 208 V three phase, delta-wye transformer if the secondary line current is 278 amperes? ( Assume 100% efficiency and round your answer to the nearest whole number.)

120 amps

What is the demand load in VA for five 10 kW and six 13 kW cooking units?

27,300 VA

What is the lighting load in VA for 203 ft What is the lighting load in VA for 203 ft. of track lighting used at continuous operation?

19,125 VA

What is the minimum sized THHN conductor which can be used to feed five arc welders. Each arc welder has a rating of 60 duty cycle and 28 amps I1eff.

1/0 THHN

What is the demand load in VA for 28-12 kW ranges installed in an apartment complex?

43,000 VA

What is the maximum sized inverse time circuit breaker which can be used to protect from overcurrent the RHW feeder conductors which are feeding four resistance welders which are rated at 30 duty cycle and 23 amperes? The feeders are 2 AWG aluminum.

300 amps

What is the load in VA for the general- purpose lighting load in a 8400 sq. ft church used continuously?

10,500 VA

What is the demand load in VA for 12-2 What is the demand load in VA for 12-2.5 kW ovens and a 12-3 kW cooktops installed in an apartment complex? ( Give your answer in kVA)

20.46 kVA

What is the load in VA for 150 ft of multioutlet assembly used to cord-and- plug connect loads that are used simultaneously?

27,000 VA

What is the minimum sized TW conductor which can be used to feed a 2 HP, single phase, 120V motor which is rated for 15 minute running and will be used for intermittent duty? The motor is rated at 21.8 FLA.

12 AWG

What is the ampacity of an XHHW aluminum, 8 AWG conductor installed in an ambient temperature of 102 degrees F? The conductor and all terminations are rated 90 degrees C.

39.5 amps

A 200 ampere, 208V single phase panel is installed for a single family dwelling. What is the minimum sized aluminum RHW conductor which can be used as a service entrance conductor?

4/0 RHW

What size copper grounding electrode conductor is required to a metal water main pipe if the service conductors are rated 350 KCMIL copper?

2 AWG

What is the demand load in VA for twenty five 15 kW ranges installed in an apartment complex?

46,000 VA

What is the maximum setting for the overload relay for a 30 HP, 480V, synchronous motor with a FLC of 26.1 amperes and a temperature rise of 40 degrees C? Assume the minimum setting has been tried and the motor will not start. Round your answer DOWN to the nearest whole number.)

36 amperes

What is the demand on the main service entrance of an apartment complex that has a single phase, 240V service for 31 dryers that have a nameplate rating of 4.3 KW? Copyright 2005 Ted "Smitty" Smith

48050 VA

What is the minimum required bending space required for four parallel runs of 250 kCMIL compact AA-8000 conductors if the conductors will enter the enclosure on the side opposite the termination lugs?

6.5 inches

A run of 4/0 THHN conductors will be ran vertically in a raceway A run of 4/0 THHN conductors will be ran vertically in a raceway. The total vertical length of the raceway is 376 feet. What is the minimum number of conductor supports that will need to be ordered for each conductor?

6

What is the demand load in VA for a 4 kW dryer?

5000 VA

What size copper equipment grounding conductor is required to ground to be ran with the ungrounded 4 THHN conductors feeding a piece of equipment which pulls a load of 18.2 amps. The conductors are fed by a 20 ampere circuit breaker? The ungrounded conductors in the circuit are size 4 THHN.

4 AWG

What is the fixed-appliance demand in VA for the ungrounded (phase) conductors with the following fastened in place appliances: 6000 VA water heater 1400 VA disposal 1050 VA compactor

8450 VA

What is the demand load in VA for 45 dryers rated at 6500 VA each?

73,125 VA

A recreational vehicle park will have ten 50A sites, fifteen 30A sites, ten 20A sites and five sites reserved for tent sites. What is the minimum demand on the main service entrance for all the sites?

38,130 VA

What is the minimum sized THHN conductor which can be used to feed a fixed storage type water heater rated at 100 gallons and 43.6 amperes?

6 AWG

What is the load in VA for 148 general- purpose duplex receptacles used to serve non- continuous operated loads in an office building?

36640 VA

What is the minimum number of 120V, 20 A circuits which can be used to feed 145 ft of multioutlet assembly used to cord-and-plug connect loads that are not used simultaneously? The assembly will have a duplex receptacle mounted every 12 inches.

3

What is the demand load in VA and amps for 15, 208 volt, single-phase cooking units rated 9 kW each?

30,000 VA

What is the demand in VA for a group of 208 volt, three-phase motors rated at 30 HP, 20 HP, and 10 HP? ( Assume these are the only motor loads on the service.) Round your answer to the nearest whole number.

69,035 VA

What minimum sized copper bonding jumper is required on the line side of a service if the service conductors are five parallel runs of 500 kCMIL copper?

350 kCMIL