Two Minute Drill #10 Copyright 2005 Ted "Smitty" Smith
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. The correct answer will transition in 10 seconds. You may also left click on the slide to manually transition. 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 Good luck Remember to start the slide show to activate the timer. Copyright 2005 Ted "Smitty" Smith
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. 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. Click on the slide to proceed. Copyright 2005 Ted "Smitty" Smith
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
Copyright 2005 Ted "Smitty" Smith wet locations (D)
What is the minimum headroom of working space required above a motor control center? 10 feet 3 feet 6.5 feet 5 feet Copyright 2005 Ted "Smitty" Smith
6.5 ft (E) Copyright 2005 Ted "Smitty" Smith
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
Copyright 2005 Ted "Smitty" Smith 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” Copyright 2005 Ted "Smitty" Smith
5/8 “ (C)(3) Copyright 2005 Ted "Smitty" Smith
The non-heating leads on heating cables must be a minimum of _______________ in length. 2 feet 3 feet 6 feet 7 feet Copyright 2005 Ted "Smitty" Smith
7 ft Copyright 2005 Ted "Smitty" Smith
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 Copyright 2005 Ted "Smitty" Smith
Blue Copyright 2005 Ted "Smitty" Smith
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. Copyright 2005 Ted "Smitty" Smith
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 Copyright 2005 Ted "Smitty" Smith
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
Copyright 2005 Ted "Smitty" Smith Equipment grounding (M)
Copyright 2005 Ted "Smitty" Smith A single grounding electrode conductor can be used to connect multiple grounding electrodes. True False
Copyright 2005 Ted "Smitty" Smith True (F)
Copyright 2005 Ted "Smitty" Smith A single rod or pipe electrode shall have a resistance of _________ ohms or less to ground. 10 ohms 15 ohms 25 ohms 50 ohms
Copyright 2005 Ted "Smitty" Smith
Copyright 2005 Ted "Smitty" Smith 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
Copyright 2005 Ted "Smitty" Smith Thermal Protection (E)(4)
Copyright 2005 Ted "Smitty" Smith Can the next standard sized overcurrent protective device be used to protect tap conductors for transformer secondary conductors? Yes No
Copyright 2005 Ted "Smitty" Smith NO (C)
Copyright 2005 Ted "Smitty" Smith All grounding electrodes as described in (A)(1) through (A)(6) that are ____________ at each building or structure served shall be bonded together to form the grounding electrode system. Present Approved Required Inspected
Copyright 2005 Ted "Smitty" Smith Present
Copyright 2005 Ted "Smitty" Smith 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
Copyright 2005 Ted "Smitty" Smith 100 cubic inches (D)
Copyright 2005 Ted "Smitty" Smith 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
Copyright 2005 Ted "Smitty" Smith .0625 inches (B)
Copyright 2005 Ted "Smitty" Smith 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
Copyright 2005 Ted "Smitty" Smith 250 kcmil (C) and Table 8 500 x 4= 2000 kcmil. 12.5% of 2000 kcmil is 250 A minimum of 250 kcmil wire is needed.
Copyright 2005 Ted "Smitty" Smith 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
Copyright 2005 Ted "Smitty" Smith Run above the top level 230.9(A)Ex
Copyright 2005 Ted "Smitty" Smith 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 100 A 150 A 200 A 225 A
Copyright 2005 Ted "Smitty" Smith 200A Table and Exception
Copyright 2005 Ted "Smitty" Smith 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
Copyright 2005 Ted "Smitty" Smith 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 Copyright 2005 Ted "Smitty" Smith
Can be rendered accessible without damaging the structure or finish Article 100 Copyright 2005 Ted "Smitty" Smith
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
Copyright 2005 Ted "Smitty" Smith 3/0 Table
Copyright 2005 Ted "Smitty" Smith 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
Copyright 2005 Ted "Smitty" Smith 300 kcmil (D) and Table 8 for circular mills
Copyright 2005 Ted "Smitty" Smith 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
Copyright 2005 Ted "Smitty" Smith 4 AWG (B) and Table 8 for circular mills
Copyright 2005 Ted "Smitty" Smith 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
Copyright 2005 Ted "Smitty" Smith False and would only be required if circuits were operating at more than 250 volts to ground.
Copyright 2005 Ted "Smitty" Smith The earth shall not be considered as an effective ground fault current path. True False
Copyright 2005 Ted "Smitty" Smith True 250.4(A)(5)
Copyright 2005 Ted "Smitty" Smith 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
Copyright 2005 Ted "Smitty" Smith their volume allowance (C)(2)
Copyright 2005 Ted "Smitty" Smith An emergency system shall be suitable for the ___________________ available fault current at its terminals. Minimum Maximum Listed rated
Copyright 2005 Ted "Smitty" Smith Maximum 700.5
Copyright 2005 Ted "Smitty" Smith 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
Copyright 2005 Ted "Smitty" Smith (A)(3)
Copyright 2005 Ted "Smitty" Smith 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
Copyright 2005 Ted "Smitty" Smith No (B)
Copyright 2005 Ted "Smitty" Smith 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 VA
Copyright 2005 Ted "Smitty" Smith 8800 VA Table Note 1
Copyright 2005 Ted "Smitty" Smith 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
Copyright 2005 Ted "Smitty" Smith VA of lighting load/120= 37.5A
Copyright 2005 Ted "Smitty" Smith Raceways that carry service-conductors that are embedded in masonry shall be __________. Sealed Arranged to drain Weatherproof None of the above
Copyright 2005 Ted "Smitty" Smith Arranged to drain
Copyright 2005 Ted "Smitty" Smith 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
Copyright 2005 Ted "Smitty" Smith 2 AWG T250.66
Copyright 2005 Ted "Smitty" Smith 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
Copyright 2005 Ted "Smitty" Smith None of the above. The actual answer is: Barrier Ex
Copyright 2005 Ted "Smitty" Smith True of False, the disconnect for a TVSS is not counted as one of the six disconnects allowed for a service. True False
Copyright 2005 Ted "Smitty" Smith True (A)
Copyright 2005 Ted "Smitty" Smith 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
Copyright 2005 Ted "Smitty" Smith 2 feet (C) Ex
Copyright 2005 Ted "Smitty" Smith 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. , (F) (C), , None of the above
Copyright 2005 Ted "Smitty" Smith , (F) 215.2(A)
Copyright 2005 Ted "Smitty" Smith 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
Copyright 2005 Ted "Smitty" Smith 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. Copyright 2005 Ted "Smitty" Smith
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
Copyright 2005 Ted "Smitty" Smith wet locations (D)
What is the minimum headroom of working space required above a motor control center? 10 feet 3 feet 6.5 feet 5 feet Copyright 2005 Ted "Smitty" Smith
6.5 ft (E) Copyright 2005 Ted "Smitty" Smith
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
Copyright 2005 Ted "Smitty" Smith 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” Copyright 2005 Ted "Smitty" Smith
5/8 “ (C)(3) Copyright 2005 Ted "Smitty" Smith
The non-heating leads on heating cables must be a minimum of _______________ in length. 2 feet 3 feet 6 feet 7 feet Copyright 2005 Ted "Smitty" Smith
7 ft Copyright 2005 Ted "Smitty" Smith
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 Copyright 2005 Ted "Smitty" Smith
Blue Copyright 2005 Ted "Smitty" Smith
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. Copyright 2005 Ted "Smitty" Smith
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 Copyright 2005 Ted "Smitty" Smith
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
Copyright 2005 Ted "Smitty" Smith Equipment grounding (M)
Copyright 2005 Ted "Smitty" Smith A single grounding electrode conductor can be used to connect multiple grounding electrodes. True False
Copyright 2005 Ted "Smitty" Smith True (F)
Copyright 2005 Ted "Smitty" Smith A single rod or pipe electrode shall have a resistance of _________ ohms or less to ground. 10 ohms 15 ohms 25 ohms 50 ohms
Copyright 2005 Ted "Smitty" Smith
Copyright 2005 Ted "Smitty" Smith 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
Copyright 2005 Ted "Smitty" Smith Thermal Protection (E)(4)
Copyright 2005 Ted "Smitty" Smith Can the next standard sized overcurrent protective device be used to protect tap conductors for transformer secondary conductors? Yes No
Copyright 2005 Ted "Smitty" Smith NO (C)
Copyright 2005 Ted "Smitty" Smith All grounding electrodes as described in (A)(1) through (A)(6) that are ____________ at each building or structure served shall be bonded together to form the grounding electrode system. Present Approved Required Inspected
Copyright 2005 Ted "Smitty" Smith Present
Copyright 2005 Ted "Smitty" Smith 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
Copyright 2005 Ted "Smitty" Smith 100 cubic inches (D)
Copyright 2005 Ted "Smitty" Smith 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
Copyright 2005 Ted "Smitty" Smith .0625 inches (B)
Copyright 2005 Ted "Smitty" Smith 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
Copyright 2005 Ted "Smitty" Smith 250 kcmil (C) and Table 8 500 x 4= 2000 kcmil. 12.5% of 2000 kcmil is 250 A minimum of 250 kcmil wire is needed.
Copyright 2005 Ted "Smitty" Smith 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
Copyright 2005 Ted "Smitty" Smith Run above the top level 230.9(A)Ex
Copyright 2005 Ted "Smitty" Smith 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 100 A 150 A 200 A 225 A
Copyright 2005 Ted "Smitty" Smith 200A Table and Exception
Copyright 2005 Ted "Smitty" Smith 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
Copyright 2005 Ted "Smitty" Smith 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 Copyright 2005 Ted "Smitty" Smith
Can be rendered accessible without damaging the structure or finish Article 100 Copyright 2005 Ted "Smitty" Smith
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
Copyright 2005 Ted "Smitty" Smith 3/0 Table
Copyright 2005 Ted "Smitty" Smith 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
Copyright 2005 Ted "Smitty" Smith 300 kcmil (D) and Table 8 for circular mills
Copyright 2005 Ted "Smitty" Smith 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
Copyright 2005 Ted "Smitty" Smith 4 AWG (B) and Table 8 for circular mills
Copyright 2005 Ted "Smitty" Smith 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
Copyright 2005 Ted "Smitty" Smith False and would only be required if circuits were operating at more than 250 volts to ground.
Copyright 2005 Ted "Smitty" Smith The earth shall not be considered as an effective ground fault current path. True False
Copyright 2005 Ted "Smitty" Smith True 250.4(A)(5)
Copyright 2005 Ted "Smitty" Smith 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
Copyright 2005 Ted "Smitty" Smith their volume allowance (C)(2)
Copyright 2005 Ted "Smitty" Smith An emergency system shall be suitable for the ___________________ available fault current at its terminals. Minimum Maximum Listed rated
Copyright 2005 Ted "Smitty" Smith Maximum 700.5
Copyright 2005 Ted "Smitty" Smith 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
Copyright 2005 Ted "Smitty" Smith (A)(3)
Copyright 2005 Ted "Smitty" Smith 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
Copyright 2005 Ted "Smitty" Smith No (B)
Copyright 2005 Ted "Smitty" Smith 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 VA
Copyright 2005 Ted "Smitty" Smith 8800 VA Table Note 1
Copyright 2005 Ted "Smitty" Smith 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
Copyright 2005 Ted "Smitty" Smith VA of lighting load/120= 37.5A
Copyright 2005 Ted "Smitty" Smith Raceways that carry service-conductors that are embedded in masonry shall be __________. Sealed Arranged to drain Weatherproof None of the above
Copyright 2005 Ted "Smitty" Smith Arranged to drain
Copyright 2005 Ted "Smitty" Smith 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
Copyright 2005 Ted "Smitty" Smith 2 AWG T250.66
Copyright 2005 Ted "Smitty" Smith 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
Copyright 2005 Ted "Smitty" Smith None of the above. The actual answer is: Barrier Ex
Copyright 2005 Ted "Smitty" Smith True of False, the disconnect for a TVSS is not counted as one of the six disconnects allowed for a service. True False
Copyright 2005 Ted "Smitty" Smith True (A)
Copyright 2005 Ted "Smitty" Smith 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
Copyright 2005 Ted "Smitty" Smith 2 feet (C) Ex
Copyright 2005 Ted "Smitty" Smith 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. , (F) (C), , None of the above
Copyright 2005 Ted "Smitty" Smith , (F) 215.2(A)
Copyright 2005 Ted "Smitty" Smith 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
Copyright 2005 Ted "Smitty" Smith System 210.5(C)