Two Minute Drill #10 Copyright 2005 Ted "Smitty" Smith

Two Minute Drill #10

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This drill is a mixture of calculations and code look up questions. You have seen many of them before. Focus on time. Try to find all the answers before the slide transitions.

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Where handhold enclosures without bottoms are installed, all enclosed conductors and any splices or terminations, if present, shall be listed as suitable for ____________. Corosive atmospheres Special locations Wet locations None of the above

wet locations 314.30(D)

What is the minimum headroom of working space required above a motor control center? 10 feet 3 feet 6.5 feet 5 feet

6.5 ft 110.26(E)

What is the minimum sized service required for a 1500 square foot single family dwelling equipped with a 14.7 kW range at 240 volts and a 1.2 kW dishwasher at 120 volts and a 1.1 kW garbage disposal at 120 V, and 3.9 kW of air conditioning at 240 volts and 9 kW of electric heat at 240 volts? 100 A 110 A 125 A 150 A

125 A Article 220 Part III

How thick must sealing compound be in a ½” seal off in a class I, div. 1 area? ½” 5/8” ¾” 1”

5/8 “ 501.15(C)(3)

The non-heating leads on heating cables must be a minimum of _______________ in length. 2 feet 3 feet 6 feet 7 feet

7 ft 424.34

Each unit length of heating cable shall have a lead wire with a color code of ______________ if it is rated to operate at 208V. Yellow Blue Orange Red

Blue 424.35

The requirement of “shall be listed” indicates that a piece of material or equipment must ______________. be accepted by an authority having jurisdiction be tested by a qualified person be listed in a publication that is produced by an

organization accepted by the authority having jurisdiction and states that the equipment of material meets appropriate designated standards or has been tested and found suitable for a specific purpose.

be listed in a publication that is produced by an organization accepted by the authority having jurisdiction and states that the equipment of material meets appropriate designated standards or has been tested and found suitable for a specific purpose.

Article 100

Where submersible pump is used in a metal well casing, the well casing shall be bonded to the pump circuit __________ conductor. Equipment grounding Bonding jumper Grounded conductor None of the above

Equipment grounding 250.112(M)

A single grounding electrode conductor can be used to connect multiple grounding electrodes. True False

True 250.64(F)

A single rod or pipe electrode shall have a resistance of _________ ohms or less to ground. 10 ohms 15 ohms 25 ohms 50 ohms

25 250.56

A ballast in a fluorescent luminaire that is used for egress lighting and energized only during a failure of the normal supply shall not have ________________. Disconnecting means Switching means Thermal protection None of the above

Thermal Protection 410.73(E)(4)

Can the next standard sized overcurrent protective device be used to protect tap conductors for transformer secondary conductors? Yes No

NO 240.21(C)

All grounding electrodes as described in 250. 52(A)(1) through 250.52(A)(6) that are ____________ at each building or structure served shall be bonded together to form the grounding electrode system. Present Approved Required Inspected

Present 250.50

An enclosure mounted to structural or supporting elements of a suspended ceiling shall be not more than ______________________ in size and shall be securely fastened in place. 25 cubic inches 50 cubic inches 75 cubic inches 100 cubic inches

100 cubic inches 314.23(D)

Sheet metal boxes not over 100 cubic inches in size shall be made from steel not less than ______ inches thick. 1 inches .5 inches .0814 inches .0625 inches

.0625 inches 314.40(B)

What is the minimum sized main bonding jumper, copper, required if a conductor is used and the supply conductors consist of 4 parallel runs of 500 kcmil copper conductors? 1/0 AWG 3/0 AWG 250 kcmil 500 kcmil

250 kcmil 250.28(C) and Table 8

500 x 4= 2000 kcmil. 12.5% of 2000 kcmil is 250 A minimum of 250 kcmil wire is needed.

The service entrance of a building may be located less than three feet from a window as long as the conductors are installed so that they___________ of the window. Run parallel to the vertical edge Run above the top level Run along the bottom leve None of the above

Run above the top level 230.9(A)Ex

What is the maximum sized duel element time delay fuse that can be used to provide branch circuit short circuit protection for a 40 hp, 208V, three-phase, induction motor, that has a nameplate full load current of 96.5 amperes? The motor is a design B motor with a marked service factor of 1.15. 100 A 150 A 200 A 225 A

200A 430.52 Table and Exception

Sheet metals screws shall not be used to connect grounding conductors or _______________ to enclosures as applied to grounding requirements. Connection devices Neutral bus bars Mounting hardware None of the above

connection devices 250.8

Which of the following best describes the definition of accessible as applied to wiring methods: Easy Do not have to leave ground to access Can be rendered accessible without

damaging the structure or finish No sweat

Can be rendered accessible without damaging the structure or finish

Article 100

What is the minimum sized grounding electrode conductor required for a service that is supplied by (4) parallel runs of 500 kCMIL service entrance conductors? The conductors are copper and the grounding electrode conductor will also be copper. 3/0 AWG 300 kcmil 500 kcmil 1/0 AWG

3/0 Table 250.66

What is the minimum sized main bonding jumper that can be used for a service that is supplied by (3) parallel runs of 750 kcmil service entrance conductors? The service entrance conductors are copper. 1/0 AWG 2/0 AWG 300 kcmil 500 kcmil

300 kcmil 250.28(D) and Table 8 for circular mills

What is the minimum sized equipment grounding conductor that is required for a circuit that is protected by a 50 ampere overcurrent protective device if the ungrounded conductors are increased in size from a number 6 AWG, THHN to a number 2 AWG, THHN? All conductors are copper. 10 AWG 8 AWG 6 AWG 4 AWG

4 AWG 250.22(B) and Table 8 for circular mills

A junction box that is 18" x 18" x 6" that has two 1 1/2" EMT conduits entering and exiting through concentric knockouts and the conduits contain conductor that are number 4 AWG, THHN must be equipped with grounding bushings, threaded bosses or bonding lock nuts to accommodate the bonding and continuity requirements of article 250 of the NEC. The circuits in the junction box are operating at 208 volts, three-phase. True False

False 250.96 and 250.97 would only be required if circuits were operating at more than 250 volts to ground.

The earth shall not be considered as an effective ground fault current path. True False

True 250.4(A)(5)

Only those conduit bodies that are durably and visibly marked by the manufacturer with __________ shall be permitted to contain splices, taps, or devices. Their size Their volume allowance Their dimensions Their manufacturer

their volume allowance 314.16(C)(2)

An emergency system shall be suitable for the ___________________ available fault current at its terminals. Minimum Maximum Listed rated

Maximum 700.5

When grounding the outer conductive shield of a coaxial cable the maximum sized ground required shall be ______________ AWG copper 2 AWG 4 AWG 6 AWG 8 AWG

6 820.100(A)(3)

If a system is a three phase, three wire Delta configured system, operating at 230 Volts, is it required to be a grounded system? Yes No

No 250.20(B)

What is the demand on the main service entrance of a single family dwelling of a range with a nameplate rating of 13.9 kVA at 240 volts? 8000 VA 8800 VA 9600 VA 10000 VA

8800 VA Table 220.55 Note 1

What is the minimum number of 15 ampere lighting circuits required for a 1500 square foot single family dwelling equipped with a 14.7 kW range at 240 volts and a 1.2 kW dishwasher at 120 volts and a 1.1 kW garbage disposal at 120 V, and 3.9 kW of air conditioning at 240 volts and 9 kW of electric heat at 240 volts? 1 2 3 5

3 4500 VA of lighting load/120= 37.5A

Raceways that carry service-conductors that are embedded in masonry shall be __________. Sealed Arranged to drain Weatherproof None of the above

Arranged to drain 230.53

What is the minimum sized grounding electrode conductor that can be used if the service entrance conductors are 250 kCMIL copper? 1 AWG 2 AWG 3 AWG 3/0 AWG

2 AWG T250.66

A cable tray may serve to carry service-entrance conductors along with other conductors as long as there is a ________. Constraint Listed device Approved means None of the above

None of the above. The actual answer is: Barrier

230.44Ex

True of False, the disconnect for a TVSS is not counted as one of the six disconnects allowed for a service. True False

True 230.71(A)

The service head for entrance-conductors should be located above the point of attachment but may be located elsewhere as long as the attachment is within __________ feet. 1 feet 2 feet 3 feet 8 feet

2 feet 230.54(C) Ex

The size of a feeder, grounded conductor shall not be smaller than required by_________, except that _________ shall not apply where grounded conductors are run in parallel. 250.122, 250.122(F) 110.14(C), 130.4 220.55, 310.16 None of the above

250.122, 250.122(F) 215.2(A)

Where the premises wiring system has branch circuits supplied from more than one nominal voltage system, each ungrounded conductor of a branch circuit, where accessible, shall be identified by __________. Phase Color code System supply

System 210.5(C)

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.

Where handhold enclosures without bottoms are installed, all enclosed conductors and any splices or terminations, if present, shall be listed as suitable for ____________. Corosive atmospheres Special locations Wet locations None of the above

wet locations 314.30(D)

What is the minimum headroom of working space required above a motor control center? 10 feet 3 feet 6.5 feet 5 feet

6.5 ft 110.26(E)

What is the minimum sized service required for a 1500 square foot single family dwelling equipped with a 14.7 kW range at 240 volts and a 1.2 kW dishwasher at 120 volts and a 1.1 kW garbage disposal at 120 V, and 3.9 kW of air conditioning at 240 volts and 9 kW of electric heat at 240 volts? 100 A 110 A 125 A 150 A

125 A Article 220 Part III

How thick must sealing compound be in a ½” seal off in a class I, div. 1 area? ½” 5/8” ¾” 1”

5/8 “ 501.15(C)(3)

The non-heating leads on heating cables must be a minimum of _______________ in length. 2 feet 3 feet 6 feet 7 feet

7 ft 424.34

Each unit length of heating cable shall have a lead wire with a color code of ______________ if it is rated to operate at 208V. Yellow Blue Orange Red

Blue 424.35

The requirement of “shall be listed” indicates that a piece of material or equipment must ______________. be accepted by an authority having jurisdiction be tested by a qualified person be listed in a publication that is produced by an

organization accepted by the authority having jurisdiction and states that the equipment of material meets appropriate designated standards or has been tested and found suitable for a specific purpose.

be listed in a publication that is produced by an organization accepted by the authority having jurisdiction and states that the equipment of material meets appropriate designated standards or has been tested and found suitable for a specific purpose.

Article 100

Where submersible pump is used in a metal well casing, the well casing shall be bonded to the pump circuit __________ conductor. Equipment grounding Bonding jumper Grounded conductor None of the above

Equipment grounding 250.112(M)

A single grounding electrode conductor can be used to connect multiple grounding electrodes. True False

True 250.64(F)

A single rod or pipe electrode shall have a resistance of _________ ohms or less to ground. 10 ohms 15 ohms 25 ohms 50 ohms

25 250.56

A ballast in a fluorescent luminaire that is used for egress lighting and energized only during a failure of the normal supply shall not have ________________. Disconnecting means Switching means Thermal protection None of the above

Thermal Protection 410.73(E)(4)

Can the next standard sized overcurrent protective device be used to protect tap conductors for transformer secondary conductors? Yes No

NO 240.21(C)

All grounding electrodes as described in 250. 52(A)(1) through 250.52(A)(6) that are ____________ at each building or structure served shall be bonded together to form the grounding electrode system. Present Approved Required Inspected

Present 250.50

An enclosure mounted to structural or supporting elements of a suspended ceiling shall be not more than ______________________ in size and shall be securely fastened in place. 25 cubic inches 50 cubic inches 75 cubic inches 100 cubic inches

100 cubic inches 314.23(D)

Sheet metal boxes not over 100 cubic inches in size shall be made from steel not less than ______ inches thick. 1 inches .5 inches .0814 inches .0625 inches

.0625 inches 314.40(B)

What is the minimum sized main bonding jumper, copper, required if a conductor is used and the supply conductors consist of 4 parallel runs of 500 kcmil copper conductors? 1/0 AWG 3/0 AWG 250 kcmil 500 kcmil

250 kcmil 250.28(C) and Table 8

500 x 4= 2000 kcmil. 12.5% of 2000 kcmil is 250 A minimum of 250 kcmil wire is needed.

The service entrance of a building may be located less than three feet from a window as long as the conductors are installed so that they___________ of the window. Run parallel to the vertical edge Run above the top level Run along the bottom leve None of the above

Run above the top level 230.9(A)Ex

What is the maximum sized duel element time delay fuse that can be used to provide branch circuit short circuit protection for a 40 hp, 208V, three-phase, induction motor, that has a nameplate full load current of 96.5 amperes? The motor is a design B motor with a marked service factor of 1.15. 100 A 150 A 200 A 225 A

200A 430.52 Table and Exception

Sheet metals screws shall not be used to connect grounding conductors or _______________ to enclosures as applied to grounding requirements. Connection devices Neutral bus bars Mounting hardware None of the above

connection devices 250.8

Which of the following best describes the definition of accessible as applied to wiring methods: Easy Do not have to leave ground to access Can be rendered accessible without

damaging the structure or finish No sweat

Can be rendered accessible without damaging the structure or finish

Article 100

What is the minimum sized grounding electrode conductor required for a service that is supplied by (4) parallel runs of 500 kCMIL service entrance conductors? The conductors are copper and the grounding electrode conductor will also be copper. 3/0 AWG 300 kcmil 500 kcmil 1/0 AWG

3/0 Table 250.66

What is the minimum sized main bonding jumper that can be used for a service that is supplied by (3) parallel runs of 750 kcmil service entrance conductors? The service entrance conductors are copper. 1/0 AWG 2/0 AWG 300 kcmil 500 kcmil

300 kcmil 250.28(D) and Table 8 for circular mills

What is the minimum sized equipment grounding conductor that is required for a circuit that is protected by a 50 ampere overcurrent protective device if the ungrounded conductors are increased in size from a number 6 AWG, THHN to a number 2 AWG, THHN? All conductors are copper. 10 AWG 8 AWG 6 AWG 4 AWG

4 AWG 250.22(B) and Table 8 for circular mills

A junction box that is 18" x 18" x 6" that has two 1 1/2" EMT conduits entering and exiting through concentric knockouts and the conduits contain conductor that are number 4 AWG, THHN must be equipped with grounding bushings, threaded bosses or bonding lock nuts to accommodate the bonding and continuity requirements of article 250 of the NEC. The circuits in the junction box are operating at 208 volts, three-phase. True False

False 250.96 and 250.97 would only be required if circuits were operating at more than 250 volts to ground.

The earth shall not be considered as an effective ground fault current path. True False

True 250.4(A)(5)

Only those conduit bodies that are durably and visibly marked by the manufacturer with __________ shall be permitted to contain splices, taps, or devices. Their size Their volume allowance Their dimensions Their manufacturer

their volume allowance 314.16(C)(2)

An emergency system shall be suitable for the ___________________ available fault current at its terminals. Minimum Maximum Listed rated

Maximum 700.5

When grounding the outer conductive shield of a coaxial cable the maximum sized ground required shall be ______________ AWG copper 2 AWG 4 AWG 6 AWG 8 AWG

6 820.100(A)(3)

If a system is a three phase, three wire Delta configured system, operating at 230 Volts, is it required to be a grounded system? Yes No

No 250.20(B)

What is the demand on the main service entrance of a single family dwelling of a range with a nameplate rating of 13.9 kVA at 240 volts? 8000 VA 8800 VA 9600 VA 10000 VA

8800 VA Table 220.55 Note 1

What is the minimum number of 15 ampere lighting circuits required for a 1500 square foot single family dwelling equipped with a 14.7 kW range at 240 volts and a 1.2 kW dishwasher at 120 volts and a 1.1 kW garbage disposal at 120 V, and 3.9 kW of air conditioning at 240 volts and 9 kW of electric heat at 240 volts? 1 2 3 5

3 4500 VA of lighting load/120= 37.5A

Raceways that carry service-conductors that are embedded in masonry shall be __________. Sealed Arranged to drain Weatherproof None of the above

Arranged to drain 230.53

What is the minimum sized grounding electrode conductor that can be used if the service entrance conductors are 250 kCMIL copper? 1 AWG 2 AWG 3 AWG 3/0 AWG

2 AWG T250.66

A cable tray may serve to carry service-entrance conductors along with other conductors as long as there is a ________. Constraint Listed device Approved means None of the above

None of the above. The actual answer is: Barrier

230.44Ex

True of False, the disconnect for a TVSS is not counted as one of the six disconnects allowed for a service. True False

True 230.71(A)

The service head for entrance-conductors should be located above the point of attachment but may be located elsewhere as long as the attachment is within __________ feet. 1 feet 2 feet 3 feet 8 feet

2 feet 230.54(C) Ex

The size of a feeder, grounded conductor shall not be smaller than required by_________, except that _________ shall not apply where grounded conductors are run in parallel. 250.122, 250.122(F) 110.14(C), 130.4 220.55, 310.16 None of the above

250.122, 250.122(F) 215.2(A)

Where the premises wiring system has branch circuits supplied from more than one nominal voltage system, each ungrounded conductor of a branch circuit, where accessible, shall be identified by __________. Phase Color code System supply

System 210.5(C)

Two Minute Drill #10 Copyright 2005 Ted "Smitty" Smith

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