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