Deck 8: Service Entrance Equipment and Installation

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.

A) threaded hub
B) bushing
C) connector nut
D) insulated bushing

Answer 1

D

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.

A) Triplex cable
B) Service drop conductors
C) Service laterals
D) Service entrance cable

Answer 2

D

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.

Answer 3

True

Question 4

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

A) 310.15 (B)(16)
B) 300.5
C) 250.66
D) 220.12

Question 5

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

A) service entrance cable
B) service drop conductors
C) service laterals
D) SEU cable

Question 6

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

A) 210
B) 200
C) 110
D) 100

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.

A) 12"
B) 18"
C) 24"
D) 30"

Question 8

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

A) 8
B) 12
C) 18
D) 24

Question 9

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

Question 10

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

A) 1
B) 1.5
C) 2
D) 3

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.

A) 1
B) 3
C) 2
D) 4

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.

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.

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.

A) 3
B) 8
C) 10
D) 12

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.

A) rigid metal conduit
B) intermediate metal conduit
C) electrical metallic tubing
D) schedule 80 rigid pvc 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.

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.

A) 3
B) 5
C) 7
D) 9

Question 18

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

A) service drop conductors
B) service entrance conductors
C) service lateral
D) triplex conductors

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.

Question 20

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

Question 21

Explain why sub-panels are often used in residential services.

Question 22

Explain the purpose of a weatherhead when used on either a service raceway or service entrance cable.

Question 23

A service mast is made of rigid metal conduit or intermediate metal conduit and should be at least a __________ trade size conduit to provide adequate strength.

A) 1"
B) 1.5"
C) 2"
D) 2.5"

Question 24

When Type NM or Type SER cable is used as a feeder cable supplying power to a sub-panel, the cables must be supported within __________ inches of both the main panel and the sub-panel.

A) 8
B) 12
C) 24
D) 30

Question 25

Conduit clamps used to support a service raceway installed on the side of a house must be installed no more than ____________________ feet from the weatherhead and meter socket.

Question 26

The service drop for a residential overhead service entrance is usually installed with __________.

A) service entrance cable
B) individual conductors
C) triplex cable
D) quadplex cable

Question 27

Incoming electrical power is connected to the ____________________ side of electrical equipment.

Question 28

The meter socket is usually located so the center of the kWh meter is from ____________________ to ____________________ feet above final grade.

Question 29

____________________ is a wiring technique that allows electrical power from an existing electrical panel to be fed to a new panel by a short length of cable.

Question 30

The amount of voltage that is needed to push the house electrical load current through the wires from the utility transformer, to the service panel, and back to the transformer is called __________.

A) house current
B) voltage drop
C) volts
D) pressure

Question 31

A(n) ____________________ is a type of conduit body that allows for a 90 degree change of direction in a raceway path. It is often used to allow the service raceway to run from the meter socket, through the side of the house, and continue to the service equipment enclosure.

Question 32

A(n) __________ usually includes a weatherhead, a porcelain standoff fitting, a rubber weather collar, and a piece of roof flashing.

A) service packet
B) mast kit
C) service entrance package
D) entrance kit

Question 33

If aluminum service conductors are being used, make sure a(n) ____________________ is used at each termination point to prevent oxidation of the conductors.

Question 34

Three or four USE conductors can be combined together in a single cable assembly and used in a residential underground service installation. This type of cable is referred to as __________ cable.

A) VUF
B) UF
C) SER
D) URD

Question 35

A _________________________ is installed over the service cable at the point where it goes through the hole in the side of the house to prevent water from entering the house.

Question 36

A(n) ____________________ is a surface on which a service panel or sub-panel is mounted. It is usually made of plywood and is often painted a flat black color.

Question 37

Explain what a M.L.O. panel is.

Question 38

Outgoing electrical power is connected to the ____________________ side of electrical equipment.

Question 39

The working space in front of residential service equipment as stated in NEC Section 110.26 is __________ feet.

A) 2
B) 3
C) 4
D) 5

Question 40

A/an _________________________________ is a device used to provide a connection point for cable television, satellite TV, telephone, and any other system that requires being bonded to the house electrical power system grounding electrode.

Question 41

Calculate the voltage drop of a 120/240 volt, 3-wire underground residential service installed with 2 AWG aluminum URD cable if the load is 80 amps and the one-way length of the underground service conductors is 100 feet.

Question 42

Explain the purpose of a porcelain standoff fitting.