FREE NEC Electrical Assessment Questions and Answers

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Wherever flexible cords with attachment plugs are to be used, a receptacle outlet needs to be constructed, and receptacles are __________ for the same type of cords there where they can be permanently linked.

Correct! Wrong!

According to the National Electrical Code (NEC), wherever flexible cords with attachment plugs are to be used, a receptacle outlet must be installed. This means that wherever a device or equipment is intended to be plugged in using a flexible cord, a receptacle (outlet) should be provided to accommodate the attachment plug.

What table is used to calculate the ampacity of the branch circuit wires necessary to power a three-phase, continuous-duty ac motor?

Correct! Wrong!

Table 430.250 of the National Electrical Code (NEC) is used for current values to determine the required ampacity of the branch circuit conductors to supply a 3-phase, continuous duty AC motor.
Table 430.250 provides the full-load current values for various horsepower ratings and motor types, including continuous duty AC motors. When sizing the branch circuit conductors to supply power to a continuous duty AC motor, you would use this table to find the corresponding full-load current based on the motor's horsepower rating and other specific motor characteristics.

Except for __________, panelboards must have overcurrent protection.

Correct! Wrong!

For existing panelboards used for individual residential service equipment, overcurrent protection is not required to be installed directly at the panelboard itself. Instead, the overcurrent protection is typically provided by the main overcurrent protective device located at the service entrance. This main overcurrent protective device is usually a circuit breaker or a fuse located in the main service panel.

Electrical installations must be built so that there is a minimal likelihood of fire or other combustion-related products spreading when they are placed in vertical shafts, ventilation or air-handling ducts, or hollow spaces. Openings surrounding electrical penetrations into or into fire-resistant-rated ceilings, floors, partitions, or walls must be ________ with approved techniques to preserve the current fire-resistance rating.

Correct! Wrong!

In electrical installations that pass through or are located in hollow spaces, ventilation or air-handling ducts, and vertical shafts, it is crucial to ensure that the chance of fire spread or the dissemination of products of combustion is not significantly increased. The National Electrical Code (NEC) and various building codes require compliance with fire safety measures to prevent fire hazards in such spaces.

Which of the following needs to be present for a conductor of size 4 AWG or bigger to enter a panelboard?

Correct! Wrong!

According to the National Electrical Code (NEC), an insulated bushing must be provided for a conductor of a size 4 AWG (American Wire Gauge) or larger when it enters a panelboard. The purpose of the insulated bushing is to protect the conductor from damage due to sharp edges or rough surfaces at the point where it enters the panelboard.

Emergency systems are needed by law and are categorized as emergencies by any governmental entity with jurisdiction. They are designed to automatically provide electricity and/or illumination that is essential for _____.

Correct! Wrong!

Emergency systems are designed to automatically supply power and/or illumination that is essential for safety to human life during critical situations. These systems are legally required and classified as "emergency" by governmental agencies having jurisdiction, such as building codes and safety regulations.

A luminaire (fixture) cannot be supported by the screw shell of a lampholder if it weighs more than _________ pounds or measures more than 16 inches in any direction.

Correct! Wrong!

According to the National Electrical Code (NEC), a luminaire (light fixture) that weighs more than 6 pounds or exceeds 16 inches in any dimension should not be supported solely by the screw shell of a lampholder.

General-use dimmer switches can only be used for things that are permanently installed, unless they are listed for controlling other loads and installed accordingly.

Correct! Wrong!

According to the National Electrical Code (NEC), general-use dimmer switches are typically designed and listed for controlling permanently installed incandescent luminaires (light fixtures) only, unless they are specifically listed for controlling other types of loads.

What is the maximum ampere rating, at the applied voltage, of the switch for general-purpose snap switches serving inductive loads?

Correct! Wrong!

The National Electrical Code (NEC) specifies that for general use snap switches supplying inductive loads (such as motors, transformers, solenoids, etc.), the switch's ampere rating should not exceed 50% of the ampere rating at the applied voltage.
This requirement is in place because inductive loads can create inrush currents, which are higher than the steady-state currents. When a switch interrupts the current flow to an inductive load, it may experience arcing and excessive heat due to the high inrush current. By limiting the switch's ampere rating to 50% of the ampere rating at the applied voltage, the NEC aims to ensure that the switch can handle the inrush current safely.

Branch circuits with a capacity greater than 50 amps are only permitted to provide _________ outlet loads.

Correct! Wrong!

Non-lighting outlet loads typically include receptacles, outlets, and fixed electrical equipment other than lighting fixtures. These loads may include large appliances, power tools, motors, heating and cooling equipment, and other heavy electrical loads commonly found in residential, commercial, and industrial applications.

Wiring may not be supported by or fastened to _________ when it is positioned inside the cavity of a fire-rated floor-ceiling or roof-ceiling assembly.

Correct! Wrong!

When wiring is located inside the cavity of a fire-rated floor-ceiling or roof-ceiling assembly, it is essential not to support or secure the wiring to the ceiling assembly, including the ceiling support wires.
Fire-rated floor-ceiling and roof-ceiling assemblies are designed to prevent the spread of fire from one floor or area to another in a building. To maintain the fire-resistance rating of these assemblies, it is crucial not to compromise their integrity by introducing wiring or other penetrations that could potentially provide a pathway for fire and smoke to spread.

Except as provided in Article 680, lighting systems for fountains, pools, spas, and similar settings shall be situated _________ or more horizontally from the nearest water's edge.

Correct! Wrong!

Article 680 of the NEC contains specific requirements and exceptions for the installation of electrical equipment and lighting in and around swimming pools, fountains, and similar locations where there is a risk of electrical shock due to the proximity of water.
The 3-meter (10-foot) horizontal distance requirement is intended to provide a safe distance between the electrical equipment and water sources, reducing the risk of accidental contact with electrical components and the potential for electric shock.

What are the terms for the common point on a wye-connection in a polyphase system, the midpoint of a 3-wire, direct-current system, the midpoint of a single-phase component of a 3-phase delta system, and the midpoint of a single-phase portion of a 3-wire, direct-current system?

Correct! Wrong!

The point you described, which is the midpoint on a single-phase, 3-wire system, the common point on a wye-connection in a polyphase system, the midpoint of a 3-wire, direct-current system, or the midpoint of a single-phase portion of a 3-phase delta system, is called the "Neutral Point."

Ground-fault circuit interrupter protection for employees is required on outlets that serve boat hoists manufactured by _________ and placed in dwelling unit sites.

Please select 2 correct answers

Correct! Wrong!

Outlets that supply boat hoists installed in dwelling unit locations and supplied by outlets not exceeding 240 volts and three-wire branch circuits rated at 125 volts and 15 or 20 amperes shall have ground-fault circuit-interrupter (GFCI) protection for personnel.
GFCI protection is required for outlets that are installed in areas where water and electricity can come into contact, such as in locations near docks, boat hoists, marinas, or other areas where boats are present. The GFCI protection helps to quickly de-energize the circuit when it detects a ground-fault current, which is crucial for preventing electrical shocks and protecting individuals from potentially dangerous situations.

Snap switches cannot be ganged or grouped in enclosures with other receptacles, snap switches, or similar devices unless they are positioned so that the voltage between adjacent devices is _________ volts or less, or unless they are positioned in enclosures with barriers that are securely installed and clearly marked between adjacent devices.

Correct! Wrong!

According to the National Electrical Code (NEC), snap switches (also known as toggle switches) must not be ganged or grouped in enclosures with other receptacles, snap switches, or similar devices unless certain conditions are met.

Branch circuit conductors that provide more than one outlet for _________ loads must have conductors with an ampacity that is at least equal to the branch circuit rating.

Correct! Wrong!

According to the National Electrical Code (NEC), conductors used for branch circuits that supply more than one receptacle for ungrounded loads must have an ampacity of at least the rating of the branch circuit.

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