ELECTRICAL NCCER
What will be the center- to -center measurement for two 30 degree bins in an offset bin with a height of 18 inches?
Answer: 9 inches
What is a system of grounding electrodes interconnected by grounding conductors that are buried in the earth to provide lower resistance?
Answer: A ground grid
Which of the following inscriptions on a circuit breaker indicates that the circuit breaker is designed for use on both copper and aluminum wire?
Answer: AL/ CU
What is the standard size system used in the United States?
Answer: AWG
Cable markings show all of the following EXCEPT:
Answer: Ampacity
In the event of an emergency where the lockout/ tagout device is left secured, who can remove the lockout/tagout device?
Answer: Authorize supervisor
What type of conduit body is characterized by a threaded straight hub on each end?
Answer: C
Which of the following category ratings would a meter need to have to take voltage readings at the service switchgear of an industrial facility?
Answer: CAT III
An assembly containing two or more insulated conductors and having an overall jacket is known as a:
Answer: Cable
Which of the following is the classified location where combustible dust is always present?
Answer: Class II Div I
Generally, the most ideal conductor is made of:
Answer: Copper
A dangerously high voltage is produced when someone opens the secondary circuit of a:
Answer: Current transformer
A megger will be used to check an in-service cable. The Electrician MUST be sure that the circuit is:
Answer: De-energized and locked and tagged out, and tested
Which of the following is not a reason why electrical systems must be grounded?
Answer: Dissipate lighting
The type of mounting used for lighting fixtures is indicated in the:
Answer: Electrical drawings
Which type of transformer core assembly offers low resistance to magnetic lines of force?
Answer: Iron
The transformer coils of the primary and secondary share no electrical connection, but current flows through them due to:
Answer: Mutual induction
Various minimum requirements have been set forth pertaining to overcurrent devices by the:
Answer: NEC
The resistor alloy- heating element used in power - limiting heating cables has a
Answer: Neutral temperature coefficient
What is insulating tape?
Answer: Non-Conductive adhesive tape
Which choice best describes the two types of pushbutton operators typically used in motor controls:
Answer: Open and close
The conductors used to connect the system grounded conductor or the equipment to a grounding electrode or to a point on the grounding
Answer: Rod conductor
Materials made of copper or silver are considered
Answer: Semi - conductors
Which of these is used as a guide to assist cables entering a conduit?
Answer: Sheave
What is shown on a sectional drawing?
Answer: Side view of a building
Which plain indicates the location of structures and equipment on a property:
Answer: Site
A reduction in capacitance of a capacitator- start motor results in reduce:
Answer: Speed
What is the name of the connecting device shown in the diagram?
Answer: Split- bolt.
In hazardous locations where metal conduit is required, the conduit must be threaded with?
Answer: Standard threads
Time delay fuses are MOST commonly used in circuits subject to what type of current?
Answer: Surge (in rush)
What should be done to change rotation of a 3 phase motor?
Answer: Swap any two T leads
Which type of conductor is approved for installation in a wet location?
Answer: THHW
What instrument is used to measure current:
Answer: Voltmeter
Before using a multimeter to check voltage on a breaker you should:
Answer: check the meter with a known power source
The recommended method of attaching self regulating heating cables to pipes is by using:
Answer: fiberglass tape
for a given number of poles, what determines the speed of an AC motor?
Answer: frequency
All parts of a metal cable tray must be bonded together and:
Answer: grounded
An electrician reporting to the work area notices that the temporary wiring has been damage. what should the electrician do?
Answer: immediately report it to the supervisors
Horsepower ratings given to electric motors are related to the motors power:
Answer: input
Compounds made of porcelain and plastic are used as:
Answer: insulators
The neutral bus in a sub panel:
Answer: is isolated from the grounded bus
The outer covering on a liquid - tight flexible metal conduit is used for:
Answer: moisture seal
The Wattage outputs of series resistance heating cables depends on the total circuit length and:
Answer: resistance
What type of bond is used to change conduit elevation to clear an obstruction and then return to original elevation?
Answer: saddle
Which of these is pulled through a raceway to test for obstructions before a cable pull?
Answer: swivel
An insulated type 600 Volt crimp terminal for a 12-10 AWG is typically identified by which color code?
Answer: yellow
Which contacts are open when the switch is in the start mode?
Answer: 1 & 2
The length of bare copper conductor in a ground ring must be buried no less than 2.5' below grade and with a length of at least:
Answer: 10 Ft
An auxiliary holding contact (seal - in) on typically NEMA starter is indicated by the terminal marking:
Answer: 13 & 14
What is the source voltage in a circuit that consumes 1200 Watts at a current of 5 Amps?
Answer: 240 Volts
If a 90° stub to be bent is using 10° segments, How many bends are required?
Answer: 9
Which type of transformer has its windings connected in series?
Answer: A Wye transformer
A swivel joints connection is to be made in a cable tray installation. What must be installed?
Answer: A flexible bonding jumper
That is a trapeze type support:
Answer: A support that allows the tray to swing
With a circuit of a lagging power factor of 0.5 what should be done?
Answer: Add a capacitor to increase the power factor
When terminating the feeders to the main on switchgear, the feeders Must be braced to withstand:
Answer: Arc flash energy
What's the main characteristic of a confined space?
Answer: Limited access and egress
The AIC rating of an overcurrent protection device represents its:
Answer: MAXIMUM fault current The device will interrupt
To test the insulation resistance between the heating cable conductors and the metallic grounding use a:
Answer: Megohmmeter
What test equipment can be used to test the condition of insulation in electrical apparatus?
Answer: Megohmmeter
The equipment grounding conductor is used to interconnect and bond:
Answer: Non-current carrying metal parts
Which symbol represents the overload relay in the schematic diagram?
Answer: OL
Which of the following best describes where the type and size of overcurrent protection is found?
Answer: Panelboard schedule
The opposition to current flow referred to as:
Answer: Resistance
The opposing force to a flow of alternating current is called:
Answer: Resistors
According to the NEC, where is the "C" phase System to be located (viewing from the front) with respect to the A and switchboard
Answer: Right
Percent slip of an induction motor refers to the:
Answer: The ratio of synchronous speed to rotor speed to rotor speed of the motor
A drawing showing a point A to point B hookup of conductors is called a:
Answer: Wiring diagram
The ungrounded conductor of a 240/120 three phase Delta 4 wire system that has the higher voltage to ground must be identified with the color:
Answer: Yellow
What connector should be used to splice a 15 KV shielded cable?
Answer: compression
What protects the wires from the sharp edges of the conduit is joined to the metal?
Answer: couplings
The device used to prevent moisture from accumulating in hazardous wet locations is called a:
Answer: drain seal
When climbing a ladder Always face the ladder and:
Answer: maintain three point contact when climbing
Verifying the presence or absence of voltage should be performed only by:
Answer: qualified individuals
The conducting connection, wheather Intentional or accidental between any of an electrical system is a:
Answer: short circuit
When is it required that conductors be derated
Answer: when there are four or more current carrying -conductors in a conduit
The frequency of a circuit is 15 cycles per 1/4 second: what is the hertz (HZ) rating of the circuit?
Answer: 60
A conductor with 220 mils of insulation would have insulation thickness of:
Answer: 0.22"
A NEMA type__ enclosure offers only protection against incidental contact:
Answer: 1
What contacts are closed in the RUN mode?
Answer: 1 & 3
What is the voltage drop for a #8 (16.510 cmil) copper wire at 120v. 215 feet one way and load of 39 amps?
Answer: 10.5
What is the minimum length pool box that can be placed in a 2 inch conduit run where the conductors will be pulled straight:
Answer: 16 inches
A 10 inch offset at 30° is being made what is the distance between center to center bends?
Answer: 20 inches
What is the voltage on the high leg in the figure?
Answer: 208 Volts
According to NEC article 240.4 (D) (5), 12 AWG copper shall be protected against over current buy a device with a MAXIMUM ampacity of.
Answer: 20amps
The NEC recommends maintaining voltage within a 3% drop. If a branch circuit operates at 240 volts AC. What is the minimum circuit operating volt?
Answer: 220.
What is the total resistance of a circuit that has aa 50 - CHM resistor, a 75 - ohm resistor, and a 100 - CHM resistor in series?
Answer: 225 ohms
A type "X" conduit body has how many conduit entries:
Answer: 4
How many paths for current flow are in the current consisting of 4 resistors in parallel?
Answer: 4
The NEC requires conduit and fitting installed in hazardous locations to be wrench tight with minimum of how many engage threads?
Answer: 4
If a voltage source of a circuit provides 240 volts and there are 5 ohms of resistance, how much current is in the circuit?
Answer: 48 amps
The turns ratio of a 3 phase 13.8 kv transformer is 115 to 1. What is the output voltage of the secondary:
Answer: 480 Volts
A NEMA type __ enclosure is both watertight and corrosion- resistant.
Answer: 4X
A current transformer has a rating of 4000: 5 if 1000 amps load is on the primary, the secondary output would produce?
Answer: 5 amps
The NEC allows copper bus bars to carry 1000 amps Per square inch, if a bus bar measures 1/4 inch X2 inches how many amps is this bar allowed to carry?
Answer: 500
Rubber gloves MUST be electrically tested at MAXIMUM intervals of:
Answer: 6 Months
PVC conduit, fittings and connectors range in size from 1/2 inch to:
Answer: 6 inches
IEC style contactor coils are marked with labels of:
answer: A1 & A2
What two purposes do measuring tape and conduit serve?
answer: it can spread a uniform film of pulling compound inside the conduit and provide an accurate measure
