Question 1

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 2

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

Accepted Answer

D

Question 3

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 4

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 5

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 6

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 feet high, 30 inches wide, and extend at least __________ feet in front of the panel.

Accepted Answer

According to NEC 110.26(A)(1), the working space in front of a service entrance panel in a residential wiring application must be at least 6.5 feet high, 30 inches wide, and extend at least 3 feet in front of the panel.

Question 7

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 NEC (National Electrical Code) 250.50(A)(1), 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.

Question 8

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 for protecting conductors in situations where severe physical damage is likely, such as where underground service conductors exit a trench to run up to a meter socket on the side of a house. EMT is generally considered less durable compared to options like rigid metal conduit, intermediate metal conduit, or schedule 80 rigid PVC conduit, which are designed to withstand more severe conditions.

Question 9

When connecting subpanel 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

This is correct according to NEC regulations. The neutral and grounding conductors are bonded together at the main service panel, but must be kept separate in the subpanel.

Question 10

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

Accepted Answer

Cable hook

Question 11

__________ is a common wiring method used on the outside of a house 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 a common wiring method 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 a type of service drop conductor, and service laterals are underground wiring methods used to bring power to the house. Therefore, the best choice is D.

Question 12

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 13

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 specifically designed to provide protection to conductors by fitting onto the ends of a conduit or cable connector. Threaded hubs and connector nuts are fittings used to connect conduits together, and bushings are used to reduce the size of a conduit opening to accommodate a smaller size conductor.

Question 14

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

Accepted Answer

The conductors that run overhead from the utility transformer to the residence are called the service drop conductors. These conductors are responsible for bringing electricity from the utility transformer and delivering it to the service entrance. Service drop conductors can be made of various materials, such as aluminum or copper, and can have different sizes depending on the electrical load of the residence.

Question 15

In a subpanel, 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

Grounding bar and neutral bar are bonded together only in main panels.

Question 16

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 17

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

Accepted Answer

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

Question 18

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

Accepted Answer

EMT is a type of conduit that is approved for use as a service raceway by the National Electrical Code.

Question 19

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 to be used above ground, except where it emerges from the ground and terminates in a meter socket.

Question 20

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

Accepted Answer

Service lateral refers to the underground conductors that run from the transformer to the meter socket. Service drop conductors are the overhead wires from the utility pole to the building, while service entrance conductors refer to the wires or cables that run from the meter socket to the main distribution panel. Triplex conductors are a specific type of service drop conductor that consists of three wires.

Quiz 8: Service Entrance Equipment and Installation