IDEAL® Stay Wired to Win April Contest.
Test your knowledge with the Stay Wired to Win Electrical Quiz. The 5 Professional and 5 Apprentice participants with the highest score will move on to the August virtual finals. Ties will be determined by the least number of incorrect answers. Participation limited to one quiz attempt.
Service conductors shall have a clearance of __________ft. from doors and windows designed to open.
Where an overhead service mast is of sufficient strength it can be used to support?
What is the minimum vertical clearance for overhead service conductors that are 480 volts and run over commercial property not subject to truck traffic?
What is the maximum number of disconnecting means permitted for a service?
The service head for an overhead service shall be listed?
Ground-fault protection of equipment shall be provided for solidly grounded wye[KA1] electric services with more than 150 v to ground and less than 1000v phase to phase for each service disconnect rated _______ amps or more.
The NEC defines ________ as the conductors from the service point to the service disconnecting means.
Which of the following wiring methods is not permitted for service entrance conductors 1,000 volts or less?
What is the minimum vertical clearance of a 120/240 volt overhead service conductor over a roof with a slope of 5/12?
Which of the following methods is not permitted for service entrance conductors rated over 1000 volts when installed above ground?
What is the high leg voltage of a three-phase, four-wire delta system when the line voltage is 240?
What is the neutral current on a three-phase, 208/120-volt system when there are 15 amperes, 2 amperes, and 30 amperes on phase A, B, and C respectively?
What is the line to neutral voltage of a three-phase, four-wire wye system when the line voltage is 277 volts?
Given four resistors, 30 Ω, 80 Ω, 50 Ω, and 140 Ω installed in parallel, what is the total resistance?
What is the power consumed by resistor R
when resistor R
= 50 Ω, is connected in series with, R
=40 Ω, and in series with R
= 90 Ω. The resistors are supplied by a 120 volt, 60 Hz source?
What minimum size feeder circuit conductor would be required to stay within the NEC recommended volt drop percentage of 3% for a 480 volt, three-phase load, drawing 152 amperes, and at a length of 750 feet? (K=10.4)
Which of these does not produce harmonic currents?
Using the drawing shown, solve for the power consumed by R
=200 V, R
= 4 Ω, R
= 10 Ω, R
= 10 Ω, and R
= 1 Ω:
Solve for the total circuit current for the circuit shown when E
= 200 volts, F = 50 Hz, X
= 50 Ω, X
= 20 Ω, R = 5 Ω:
Which of the following will not improve a lagging power factor?
A building with a supply of 480/277 volts, three-phase, and 3000 ampere service has a current draw of 2250 amperes. The power factor is measured at 86%. How much true power is consumed by the building?
How many amperes would you expect to have in a three-phase circuit where you measure 5500 Watts, 480 volts, and you have a power factor of 91%?
What is the maximum amount of continuous load in amperes that may be added to a 200-ampere feeder OCPD that is not 100% rated and it already supplies 52 amperes of continuous load and 30 amperes of non-continuous load?
What is the frequency of a motor when operating at a speed of 3400 RPM and it is an 8-pole motor?
A three-phase power factor correction capacitor bank is connected to the load side of a motor overload device which supplies a three-phase motor. Which one of the following statements is correct for the installation?
What is the minimum size THW motor circuit conductor required for a three-phase motor with the following nameplate: 100 HP, 460 V, 112 FLA, 3Φ, 60 Hz, 1725 RPM, S.F. 1.15, Temp rise 50º C, Design letter B, Code letter D, Cont. Duty, Not thermally protected.
What is the maximum current rating for overload protection when starting current is not a problem for a three-phase motor with the following nameplate: 75 HP, 460 V, 83 FLA, 3Φ, 60 Hz, 1725 RPM, S.F. 1.15, Temp rise 50º C, Design letter B, Code letter D, Cont. Duty, Not thermally protected.
What is the maximum size inverse time circuit breaker permitted for branch-circuit, short-circuit, ground-fault protection for a three-phase motor when starting current is not a problem with the following nameplate: 15 HP, 460 V, 18 FLA, 3Φ, 60 Hz, 3425 RPM, S.F. 1.25, Temp rise 40º C, Design letter B, Code letter F, Cont. Duty, Not thermally protected.
What is the maximum locked rotor current for a three-phase motor with the following nameplate: 50 HP, 460 V, 56 FLA, 3Φ, 60 Hz, 3425 RPM, S.F. 1.25, Temp rise 40º C, Design letter B, Code letter K, Cont. Duty, Not thermally protected.
Which one of the following choices is the correct connection for a delta nine lead motor connection in low voltage operation?
What is the current of a three-phase, 150 HP motor operating at an efficiency of 96%, power factor of 73%, and a voltmeter reads 462 Volts?
What is the minimum size THW feeder conductor required for four motors rated 460V, three-phase, 75 HP, 50 HP, 25 HP, and 10 HP. (Assume all equipment and motors are rated 75°C)
What is the maximum standard size dual-element time delay fuse permitted for feeder overcurrent protection for four motors rated 460V, three-phase, 150 HP, 100 HP, 50 HP, and 25 HP.
What is the minimum horsepower rating for the feeder disconnect for four motors rated 460V, three-phase, 100 HP, 75 HP, 75 HP, and 50 HP.
What is the rated secondary current of a three-phase, 480//120/240 volt, 90 kVA transformer?
What is the minimum size, THW conductor, required by the Code, to be run from the secondary of a 45 kVA, three phase, 480//208/120 V, three-phase transformer, to a 200 ampere disconnect, with 150 Ampere fuses when the conductors do not exceed 25 feet in length? (The major portion of the load is nonlinear office equipment)
A 100 ampere, main lug only (MLO), three-phase panelboard, supplied by the secondary of a delta to wye, 45 kVA, 480//120/208-volt three-phase transformer, is permitted to be protected by which one of the following?
Where a 480//120/240 volt, single-phase transformer has currents of 18 amperes and 8 amperes on the ungrounded conductors of the secondary, how much current would you expect to measure on the primary side of the transformer?
Referring to the diagram shown, which item correctly describes the transformer connection?
What is the maximum standard size primary overcurrent protection device for a 75 kVA, 480//208/120-volt, three phase transformer, when providing primary and secondary protection?
What is the maximum size secondary overcurrent protection device for a 150 kVA, 480//208/120-volt, three phase transformer, when providing primary and secondary protection?
What is the minimum size THHN conductor required for the primary side of a 45 kVA, 480//208/120-volt, three phase transformer, when using the maximum permitted primary overcurrent protection device and providing only primary protection? (Assume all equipment is listed for 75°C)
What is the available fault current on the secondary side of a 112 ½ kVA transformer rated 480//120/208 volts with an impedance of 2.2%? Assume the impedance can have error of 10% and the fault current on the primary side is infinite.
Given a single-phase, 1000 VA, 240//48-volt transformer when protecting on the primary side only, what is the maximum standard size fuse permitted for primary only protection?
Given a three-phase, delta-to-delta, three-wire transformer rated 40 kVA, 480//400-volt and protecting on the primary side only with the maximum permitted overcurrent protective device, what is the minimum size THW conductor permitted to be installed on the secondary side of the transformer without overcurrent protection provided on the secondary side of the transformer? (Assume all equipment is listed for 75°C)
What is the maximum number of 14-2 NM-B cables permitted to be added to a 2” schedule 80 PVC conduit, which is 22” in length, installed from the top of a surface mounted dwelling unit service panel, when the conduit already contains six 14-2 NM-B cables with cross sections of .44 x .22 inches, and three 12-2 NM-B cables with cross sections of .48 x .26 inches?
What is the maximum number of #2/0 AWG, XHHW-2, aluminum compact conductors that are permitted to be installed 2” EMT?
What is the minimum cross sectional area for a metal wireway (answer in inches square) to contain the following: 30 - #14 THHN, 21 - #12 THHN, 4 – 3/0 XHHW, and 3 – 500 kcmil THHN?
What is the maximum number of #4 AWG THW conductors that can be installed in 1 ½ in. LFMC?
What is the maximum number of #10 AWG THHN conductors that can be installed in ¾ in. EMT?
What minimum size RMC short nipple (20” long) is required for 3-4/0 XHHW, 1-#4 XHHW, and 4-#10 XHHW conductors?
What minimum size EMT conduit is required for 9-#10 THWN, 3-#10 TW, and 1-#10 bare conductors?
What is the maximum number of #12 THHN conductors that can be installed in 2 in. EMT when there are already 40 - #14 THHN conductors already installed in the raceway?
What is the maximum number of #14 THHN conductors that are permitted to be installed in a one inch RMC raceway which is 20 inches in length and the short nipple already contains ten #14 THHN conductors?
What is the minimum size IMC conduit required for two multiconductor cables which each contain 4 conductors and a shield. The outside diameter of the cables is .625 inches.
The Listed full-load table current for a 7 ½ HP squirrel cage motor that operates at single phase 220 volts is_______ amps?
Full load current for calculating motor circuit conductor ampacities is found _____?
A lighting circuit fed from a three phase 277/480 Volt panel from a single pole 20amp breaker at 80% load will be at _________ Watts of power?
The ampacity of conductors that connect to a capacitor to the terminals of a motor shall not be less than ________ the ampacity of the motor circuit conductors and no less than 135 % of the rated current for the capacitor.
Overcurrent protection for feeders and branch circuit supplying electric vehicle supply equipment shall be sized for continuous duty and shall have a rating of not less than _____ % of the maximum load of the electric vehicle supply equipment.
What is the maximum allowed cord and plug connected load for a 20amp multioutlet branch circuit?
A _________ protective device is one which cuts off fault current in less than one half cycle.
Full load current for calculating trip settings of motor overloads is found _______?
The minimum ampacity for branch circuit conductors which supply a 75 HO 3 phase induction motor which operates at 200 Volts is _______ Amperes?
The listed full load table current for 7 1/2HP squirrel cage motor that operates at 3 phase, 208 volts is _____________ amperes?
What size grounding electrode conductor is required for an 800-amp AC electrical service supplied by 2 sets of 600 kcmil copper conductors?
What is the minimum size bare copper conductor used in a ground ring to qualify as a grounding electrode?
Additional requirements for grounding and bonding of floating buildings can be found in what NEC article?
Which of the following AC systems 50 through 1000 volts are required by the NEC to be grounded?
What is the minimum size system bonding jumper for an AC system with 3 sets of 250 kcmil aluminum conductors?
The requirements for identification of equipment grounding conductors are provided which NEC section?
What is the minimum size equipment grounding conductor for a 40-amp 240-volt circuit fed by 2-#8 thhn copper conductors?
A conducting object though which a direct connection to earth is established best describes:
Feeders supplying a separate building or structure are required to include a/an__________ connected to the building disconnecting means enclosure and to the grounding electrode.
In a separately derived system where the largest ungrounded conductor is 600 kcmil copper, what is the minimum size required system bonding jumper?
Which of the following is not permitted location for track lighting?
Lighting systems for pools, spas, fountains and similar locations shall be installed not less than ____________meters horizontally from the nearest edge of the water unless permitted by article 680.
A non IC recessed luminaire that is not identified for contact with insulation shall have all recessed parts spaced not less than ___________inches from combustible material.
Luminaires shall be permitted to be connected to busways in accordance with _________.
Luminaires that weigh in excess of _________Kg shall not be supported by the screw shell of a lamp holder.
No Parts of cord-connected luminaires, chain-, cable-, or cord-suspended luminaires, lighting track, pendants or ceiling-suspended (paddle) fans shall be located within ________feet horizontally and _________feet above the bathtub rim or shower stall threshold.
What is the general lighting load for a 170,000 sq ft manufacturing facility that has an additional 4000 sq ft of office space measured in volt-amperes?
What is the minimum distance clearance between a surface mounted incandescent or led luminaires with completely enclosed light source installed on the wall above the door or on the ceiling?
For emergency power in the event of failure of the normal power supply to or within the building or group of buildings concerned, emergency lighting, emergency power or both shall be available in a time period not to exceed ______ seconds.
Where storage batteries are used for emergency illumination batteries must be suitable rating and capacity to supply and maintain the total load for a minimum period of _______hours without voltage applied to the load not falling below 87 ½% of normal.
When using an extension ladder to gain access to a roof, the ladder should extend at least_____ above the roof edge?
The purpose of grounding a raceway is to prevent the raceway from becoming______
For a category 4 electrical hazard you will need a____________
Rubber insulating gloves and leather protector are required for shock protection at or above what voltage?
The Arc Flash Boundary is determined by the _________?
A Journeyperson is a “Qualified Person” per NFPA 70E
When using the Hierarchy of Controls, which is the most effective?
In a BALANCED three-wire, single phase system, _______ current flows in the neutral conductor?
The nameplate voltage of a motor and the supply voltage must be within ______ percent of each other.
Full Load current for calculating the TRIP SETTINGS of motor overloads is found_______?
Which type of motor control drawing is best for showing the operation of a control circuit?
Which of the following is the MOST efficient of the four basic approaches for troubleshooting?
In a motor installation, fuses and breakers are sized to protect the_____?
In a motor installation the overloads are sized to protect the________?
Which pilot device is LEAST likely to have an adjustable differential?
Thank you for participating in the IDEAL Stay Wired to Win Competition!!
Thank you for participating in the IDEAL Stay Wired to Win Competition!!