Question 1

A(n) __________ is a plastic or fiber fitting designed to screw onto the ends of a conduit or cable connector to provide protection to the conductors.

Accepted Answer

An insulated bushing is a plastic or fiber fitting that provides protection to the conductors of a conduit or cable connector. It is designed to screw onto the ends of a conduit or cable connector. A threaded hub is a fitting that is used to connect conduit to an enclosure or another conduit. A bushing is a fitting that is used to reduce the size of the opening in a conduit or panel. A connector nut is a type of fastener used to connect two threaded components together.

Question 2

__________ is a common wiring method used to bring the electrical power from the point of attachment to the meter socket and then on to the main service equipment.

Accepted Answer

Service entrance cable is typically used to bring electrical power from the point of attachment to the meter socket and then on to the main service equipment. Triplex cable is used for overhead service connections, while service drop conductors and service laterals refer to the specific types of service entrance cables used in specific situations.

Question 3

When connecting sub-panel feeder conductors in the main panel, both the grounded neutral conductor and the grounding conductor are connected to the main panel grounded neutral bar.

Accepted Answer

Both the grounded neutral conductor and the grounding conductor are connected to the main panel grounded neutral bar when connecting sub-panel feeder conductors in the main panel.

Question 4

The NEC requirements for minimum burial depths are found in Table __________.

Accepted Answer

The NEC requirements for minimum burial depths are found in Table 300.5.

Question 5

The conductors that run overhead from the utility transformer to the residence are called the __________.

Accepted Answer

Service drop conductors are the conductors that run overhead from the utility transformer to the residence. Service entrance cable is a type of cable used for the electrical service entrance, but it refers to the cable that runs from the meter to the main breaker panel. Service laterals refer to the conductors that run underground from the utility transformer to the meter. SEU cable is a type of cable that can be used for both the service drop and the service entrance cable.

Question 6

The NEC provides the specifications for working space around electrical equipment in Article __________.

Accepted Answer

NEC Article 110 provides the specifications for working space around electrical equipment.

Question 7

When using service entrance cable for the run between the weatherhead and the meter socket, the cable must be supported within __________ of both the weatherhead and the meter socket.

Accepted Answer

The National Electrical Code (NEC) requires that service entrance cables be supported within 12 inches of the weatherhead and the meter socket to ensure stability and safety.

Question 8

When installing an underground service, a warning tape must be installed at least __________ inches above the buried service entrance conductors.

Accepted Answer

Warning tape for underground services must be installed at least 12 inches above the buried service entrance conductors to provide a warning before the actual conductors are reached during digging or excavation.

Question 9

A porcelain standoff fitting is used to attach the service drop cable to the side of a house.

Accepted Answer

Cable hook

Question 10

When installing an overhead service, __________ feet of conductor should stick out of the weatherhead for the formation of a drip loop.

Accepted Answer

The answer of When installing an overhead service, __________ feet...

Question 11

According to the NEC, the working space in front of a service entrance panel in a residential wiring application must be at least 6.5' high, 30" wide, and extend at least __________ feet in front of the panel.

Accepted Answer

The National Electrical Code (NEC) requires a minimum working space of 3 feet in front of electrical panels to ensure safety and accessibility for maintenance and operation.

Question 12

Section 338.12(B)(2) does not allow USE to be used above ground, except where it emerges from the ground and terminates in a meter socket.

Accepted Answer

Section 338.12(B)(2) of the National Electrical Code does not allow USE (underground service entrance) to be used above ground, except where it emerges from the ground and terminates in a meter socket.

Question 13

In a sub-panel, the grounding bar and the neutral bar are electrically connected together so that the white grounded conductors and the bare or green grounding conductors can all terminate at the same location.

Accepted Answer

In a sub-panel, the grounding bar and the neutral bar should be separate and NOT electrically connected together. The grounded (neutral) conductors would terminate at the neutral bar, while the grounding conductors would terminate at the grounding bar.

Question 14

Where underground service cables exit the trench and run up a utility pole to the transformer, the conductors must be protected from physical damage to a height of __________ feet above final grade.

Accepted Answer

The conductors must be protected from physical damage to a height of 8 feet above final grade. This is a standard safety requirement to prevent accidental contact or damage to the cables.

Question 15

Where underground service conductors exit the trench to run up to a meter socket on the side of a house, __________ is not permitted to be used to provide the conductors with protection from physical damage.

Accepted Answer

Electrical metallic tubing (EMT) is not permitted to be used for protection from physical damage in this scenario because it is not considered as robust as the other options like rigid metal conduit or intermediate metal conduit.

Question 16

When installing a service entrance cable to the bottom of a meter socket enclosure located on the side of a house, you must use a rain-tight connector like the one used to connect the cable to the threaded hub.

Accepted Answer

A "regular" cable clamp can be used.

Question 17

The grounding electrode conductor must be attached to a metal water pipe grounding electrode no more than __________ feet from the point where the metal water pipe enters the house.

Accepted Answer

According to the National Electrical Code (NEC), the grounding electrode conductor must be attached to a metal water pipe grounding electrode no more than 5 feet from the point where the metal water pipe enters the house. This ensures proper grounding and safety in the event of electrical faults.

Question 18

The service conductors that run underground from the utility transformer to the meter socket are known as the __________.

Accepted Answer

Service lateral conductors run underground from the utility transformer to the meter socket. The service drop conductors run overhead, the service entrance conductors connect the service lateral/drop to the main panel, and triplex conductors are a specific type of service drop conductor.

Question 19

If a metal water pipe is used as a grounding electrode, a supplemental grounding electrode must be used only if the resistance to ground exceeds 25 ohms.

Accepted Answer

A supplemental grounding electrode must be used with a metal water pipe regardless of the resistance to ground.

Question 20

Electrical Metallic Tubing is permitted to be used as a service raceway.

Accepted Answer

Electrical Metallic Tubing (EMT) is permitted to be used as a service raceway as per the National Electrical Code (NEC).

Quiz 8: Service Entrance Equipment and Installation