Two Minute Drill #8 Copyright 2005 Ted "Smitty" Smith Practice Code Look Up

Two Minute Drill #8

Copyright 2005 Ted "Smitty" Smith

Practice Code Look Up

Directions


Left click on the presentation ICON located at the bottom of the slide directory to the left of the this slide.

Each slide will transition to the correct answer automatically in 2:00 minutes or less. The correct answer will transition in 10 seconds.

Do not worry about writing down the correct answer for now. You will have the opportunity to do that at the end of the two minute drill exercise.

Good luck

Further More


Remember do not worry about writing down the right answer for now. When you reach the end all of the slides will be repeated without the timer so you can take your time to find the ones you missed and write down the correct answers then.

Concentrate on finding the answers using the targeting method and then worry about the correct answers after you reach the slide that says the end.

All of the questions now will be multiple choice. Click on the slide to proceed.

Conductors


Conductors larger than ___________ AWG may be marked as grounded and equipment grounding conductors by using the correctly colored electrical tape and wrapping it around the conductors insulation. A. 2 B. 4 C. 6 D. 8

Conductors


C. 6 AWG 250.119(A) and 200.6(B)

Equipment


A ballast in a fluorescent luminaire that is used for egress lighting and energized only during the a failure of the normal supply shall not have thermal protection. A. TrueB. False

Equipment


A. True 410.73(E)(4)

Grounding


Contact devices or yokes designed and listed as __________________ shall be permitted in conjunction with the supporting screws to establish the grounding circuit between the device yoke and flush-type boxes. A. self tappingB. secured in placeC. self groundingD. automatically grounded

Grounding


C. self grounding 250.146(B)

Calculations


A motor circuit feeds three squirrel cage motors. The circuit is a three-phase, 208V circuit. Motor A is a three phase, 40hp, with a nameplate FLC of 101.6 A, a Marked Service Factor of 1.2, and is a design B motor. Motor B is a three phase, 15hp, with a nameplate FLC of 39.2 A and is a Design C motor, and Motor C is a single phase, 7.5hp, with a nameplate FLC of 33.8 A, a marked service factor of 1.6 and is a design K motor. All of the motors are protected with duel element fuses for short circuit branch circuit protection.

What is the minimum sized THHN conductor that can be used to feed this circuit?

A. 1/0 AWG

B. 200 Kcmil

C. 250 Kcmil

D. 300 Kcmil

Calculations


D. 300 Kcmil

Don’t forget to consider 110.14(C) when determining the conductor size.

Calculations


A motor circuit feeds three squirrel cage motors. The circuit is a three-phase, 208V circuit. Motor A is a three phase, 40hp, with a nameplate FLC of 101.6 A, a Marked Service Factor of 1.2, and is a design B motor. Motor B is a three phase, 15hp, with a nameplate FLC of 39.2 A, with a marked service factor of 1.15 and is a Design C motor, and Motor C is a single phase, 7.5hp, with a nameplate FLC of 33.8 A, a marked service factor of 1.6 and is a design K motor. All of the motors are protected with duel element fuses for short circuit branch circuit protection.

What is the minimum sized overload protection that could be used for motor C?

A. 36 A

B. 57.75 A

C. 49 A

D. None of the above

Calculations


C. 49 Amps 430.322(A)Do not round off answers or use standard

size fuses when determining over load sizes.

Calculations



What is the maximum sized short circuit branch circuit protection that can be used for motor A if a duel element, time delayed fuse where to be used?

A.177.8 AB.180 AC.200 AD.175 A

Calculations


C. 200 A

Remember that you round up to the next standard size for branch circuit protection and also that you use the table value for the full load current, not the name plate value.

The nameplate value is used only for determining the overload protection.

Calculations



What is the maximum size or setting of overload protection that can be used to protect motor C if an overload relay is used?

A. 47.32B. 43.94C. 42.25D. 38.33

Services


A. 47.32 430.32(C)

Remember to use the nameplate full load current

Calculations



What is the maximum sized duel element fuse that can be used to protect the feeder conductors for this motor circuit if motor A has 125A duel element fuses for branch circuit protection and motor B has 50 ampere duel element fuses for branch circuit protection and motor C has 50 ampere duel element fuses for branch circuit protection.

A. 190a B. 200a C. 215a D. 250a

Calculations


B. 200 a

Remember to round down to the next standard size for feeder protection. Also remember to look at 240.6 to ensure you are using the correct standard sizes.

Motors


Controllers, other than ______________ and molded case switches, shall have horsepower ratings at the application voltage not lower than the horsepower rating of the motor.

A. dual element fusesB. Instantaneous trip circuit breakersC. Inverse time circuit breakersD. None of the above

Motor


C. Inverse time circuit breakers 430.83(A)

Raceways


ENT must be secured in place every ______. A. 12 inchesB. 18 inchesC. 24 inchesD. 36 inches

Raceways


D. 36 inches 362.30(A)

Raceways


The minimum burial depth for a nonmetallic raceway under a 4 inch thick concrete exterior slab in a wide driveway for a commercial building shall be __________________ inches.

A. 4 inchesB. 12 inchesC. 18 inchesD. 24 inches

Raceways


24" Table 300.5 Col. 3

Calculations


What is the demand on the main service entrance cable for a 15.6kw rated range at 240V?

A. 8000 wattsB. 9000 wattsC. 9600 wattsD. 10000 watts

Calculations


9600 watts Tble 220.55 note 1

Equipment


In areas used for patient care, the grounding terminals of all receptacles and all non-current carrying conductive surfaces of fixed electric equipment ______________ shall be grounded by an insulated copper equipment grounding conductor.

Operating at over 100 VLikely to become energizedSubject to personal contactAll of these

Equipment


All of these 517.13(B)

Equipment


At what ambient temperature must conductors be coordinated for determining ampacity if they are installed above a radiant heating ceiling panel?

20 degrees C40 degrees C50 degrees CNone of above

Equipment


50 degrees C 424.94

Equipment Use


Receptacles mounted in boxes that are set back of the wall surface shall be installed so that the mounting ____________________ of the receptacle is held rigidly at the surface of the wall

Screws or nailsyoke or strap face platenone of these

Equipment Use


yoke or strap 406.4(A)

Equipment


Receptacle faceplate covers made of insulating material shall be noncombustible and not less than _____________ in thickness.

.10 in .04 in.01 in.22 in

Equipment


.10 in 406.5(C)

Equipment


Receptacles installed outdoors in a location protected from the weather or other damp locations shall be in an enclosure that is _____________________ when the receptacle is covered.

rain tightweatherproof rainproofweather tight

Equipment


weatherproof 406.8(A)

Equipment


Electric heaters of the cord and plug connected immersion type shall be constructed and installed so that current carrying parts are effectively ____________ from electrical contact with the substance in which they are immersed.

isolatedprotectedinsulated 422.44all of these

Equipment


insulated 422.44

Equipment


The minimum clearance between an electric space-heating cable and an outlet box used for surface luminaries shall not be less than _________________.

8 in 14 in18 in6 in

Equipment Use


8 in 424.39

Calculations


What is the minimum sized conductor that can be used for a 20 ampere load if the conductors will be installed in a conduit with a total of 9 current carrying conductors. The conductors will be TW conductors. A. 12 AWGB. 10 AWGC. 8 AWGD. 6 AWG

Feeders and Branch Circuits


10 AWG Tble 310.16 and Tble 310.15(B)(2)(a)

The End


Each of the slides will now be repeated.They are not timed in this segment. To

change a slide, click on the side with your left mouse button.

Be sure to physically look up the answers in your code book to improve your look up speed and skill.

Conductors


Conductors larger than ___________ AWG may be marked as grounded and equipment grounding conductors by using the correctly colored electrical tape and wrapping it around the conductors insulation. A. 2 B. 4 C. 6 D. 8

Conductors


C. 6 AWG 250.119(A) and 200.6(B)

Equipment


A ballast in a fluorescent luminaire that is used for egress lighting and energized only during the a failure of the normal supply shall not have thermal protection. A. TrueB. False

Equipment


A. True 410.73(E)(4)

Grounding


Contact devices or yokes designed and listed as __________________ shall be permitted in conjunction with the supporting screws to establish the grounding circuit between the device yoke and flush-type boxes. A. self tappingB. secured in placeC. self groundingD. automatically grounded

Grounding


C. self grounding 250.146(B)

Calculations


A motor circuit feeds three squirrel cage motors. The circuit is a three-phase, 208V circuit. Motor A is a three phase, 40hp, with a nameplate FLC of 101.6 A, a Marked Service Factor of 1.2, and is a design B motor. Motor B is a three phase, 15hp, with a nameplate FLC of 39.2 A and is a Design C motor, and Motor C is a single phase, 7.5hp, with a nameplate FLC of 33.8 A, a marked service factor of 1.6 and is a design K motor. All of the motors are protected with duel element fuses for short circuit branch circuit protection.

What is the minimum sized THHN conductor that can be used to feed this circuit?

A. 1/0 AWG

B. 200 Kcmil

C. 250 Kcmil

D. 300 Kcmil

Calculations


D. 300 Kcmil

Don’t forget to consider 110.14(C) when determining the conductor size.

Calculations



What is the minimum sized overload protection that could be used for motor C?

A. 36 A

B. 57.75 A

C. 49 A

D. None of the above

Calculations


C. 49 Amps 430.322(A)Do not round off answers or use standard

size fuses when determining over load sizes.

Calculations



What is the maximum sized short circuit branch circuit protection that can be used for motor A if a duel element, time delayed fuse where to be used?

A.177.8 AB.180 AC.200 AD.175 A

Calculations


C. 200 A

Remember that you round up to the next standard size for branch circuit protection and also that you use the table value for the full load current, not the name plate value.

The nameplate value is used only for determining the overload protection.

Calculations



What is the maximum size or setting of overload protection that can be used to protect motor C if an overload relay is used?

A. 47.32B. 43.94C. 42.25D. 38.33

Services


A. 47.32 430.32(C)

Remember to use the nameplate full load current

Calculations



What is the maximum sized duel element fuse that can be used to protect the feeder conductors for this motor circuit if motor A has 125A duel element fuses for branch circuit protection and motor B has 50 ampere duel element fuses for branch circuit protection and motor C has 50 ampere duel element fuses for branch circuit protection.

A. 190a B. 200a C. 215a D. 250a

Calculations


B. 200 a

Remember to round down to the next standard size for feeder protection. Also remember to look at 240.6 to ensure you are using the correct standard sizes.

Motors


Controllers, other than ______________ and molded case switches, shall have horsepower ratings at the application voltage not lower than the horsepower rating of the motor.

A. dual element fusesB. Instantaneous trip circuit breakersC. Inverse time circuit breakersD. None of the above

Motor


C. Inverse time circuit breakers 430.83(A)

Raceways


ENT must be secured in place every ______. A. 12 inchesB. 18 inchesC. 24 inchesD. 36 inches

Raceways


D. 36 inches 362.30(A)

Raceways


The minimum burial depth for a nonmetallic raceway under a 4 inch thick concrete exterior slab in a wide driveway for a commercial building shall be __________________ inches.

A. 4 inchesB. 12 inchesC. 18 inchesD. 24 inches

Raceways


24" Table 300.5 Col. 3

Calculations


What is the demand on the main service entrance cable for a 15.6kw rated range at 240V?

A. 8000 wattsB. 9000 wattsC. 9600 wattsD. 10000 watts

Calculations


9600 watts Tble 220.55 note 1

Equipment


In areas used for patient care, the grounding terminals of all receptacles and all non-current carrying conductive surfaces of fixed electric equipment ______________ shall be grounded by an insulated copper equipment grounding conductor.

Operating at over 100 VLikely to become energizedSubject to personal contactAll of these

Equipment


All of these 517.13(B)

Equipment


At what ambient temperature must conductors be coordinated for determining ampacity if they are installed above a radiant heating ceiling panel?

20 degrees C40 degrees C50 degrees CNone of above

Equipment


50 degrees C 424.94

Equipment Use


Receptacles mounted in boxes that are set back of the wall surface shall be installed so that the mounting ____________________ of the receptacle is held rigidly at the surface of the wall

Screws or nailsyoke or strap face platenone of these

Equipment Use


yoke or strap 406.4(A)

Equipment


Receptacle faceplate covers made of insulating material shall be noncombustible and not less than _____________ in thickness.

.10 in .04 in.01 in.22 in

Equipment


.10 in 406.5(C)

Equipment


Receptacles installed outdoors in a location protected from the weather or other damp locations shall be in an enclosure that is _____________________ when the receptacle is covered.

rain tightweatherproof rainproofweather tight

Equipment


weatherproof 406.8(A)

Equipment


Electric heaters of the cord and plug connected immersion type shall be constructed and installed so that current carrying parts are effectively ____________ from electrical contact with the substance in which they are immersed.

isolatedprotectedinsulated 422.44all of these

Equipment


insulated 422.44

Equipment


The minimum clearance between an electric space-heating cable and an outlet box used for surface luminaries shall not be less than _________________.

8 in 14 in18 in6 in

Equipment Use


8 in 424.39

Calculations


What is the minimum sized conductor that can be used for a 20 ampere load if the conductors will be installed in a conduit with a total of 9 current carrying conductors. The conductors will be TW conductors. A. 12 AWGB. 10 AWGC. 8 AWGD. 6 AWG

Feeders and Branch Circuits


10 AWG Tble 310.16 and Tble 310.15(B)(2)(a)

Documents

Two Minute Drill #8 Copyright 2005 Ted "Smitty" Smith Practice Code Look Up