Question 1

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

Accepted Answer

The answer of Explain why sub-panels are often used in...

Question 2

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

Accepted Answer

The answer of Explain the purpose of a weatherhead when...

Question 3

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.

Accepted Answer

A service mast must be strong enough to support the overhead service conductors, which can be heavy and subject to wind and weather. A 2" conduit provides adequate strength and is the minimum recommended size for a service mast.

Question 4

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.

Accepted Answer

According to the National Electrical Code, Type NM or Type SER cable used as a feeder cable supplying power to a sub-panel must be supported within 12 inches of both the main panel and the sub-panel.

Question 5

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.

Accepted Answer

The answer of Conduit clamps used to support a service...

Question 6

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

Accepted Answer

Triplex cable is typically used for residential overhead service entrance because it consists of three conductors (two insulated and one bare) and is designed for overhead installations. Service entrance cable and individual conductors are not typically used for overhead service entrance, and quadplex cable includes an additional conductor that is not needed for residential service entrance.

Question 7

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

Accepted Answer

The answer of Incoming electrical power is connected to the...

Question 8

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

Accepted Answer

The answer of The meter socket is usually located so...

Question 9

____________________ 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.

Accepted Answer

The answer of ____________________ is a wiring technique that allows...

Question 10

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 __________.

Accepted Answer

The term that describes the amount of voltage that is lost or dropped as the electrical current flows through the wires is called voltage drop. Therefore, Option B is the correct answer. Option A is incorrect as house current refers to the amount of electrical current that is used by the house. Option C is incorrect as volts simply refer to the unit of measurement for voltage. Option D is incorrect as pressure is not a term used to describe electrical voltage.

Question 11

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.

Accepted Answer

The answer of A(n) ____________________ is a type of conduit...

Question 12

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

Accepted Answer

The components described, including a weatherhead, porcelain standoff fitting, rubber weather collar, and piece of roof flashing, are all commonly found in a mast kit used for electrical service entrance. The other options (service packet, service entrance package, entrance kit) may or may not be specific to the electrical service entrance but do not specifically refer to this set of components.

Question 13

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

Accepted Answer

The answer of If aluminum service conductors are being used,...

Question 14

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.

Accepted Answer

Three or four USE conductors combined together in a single cable assembly for residential underground service installation is referred to as Underground Residential Distribution (URD) cable.

Question 15

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.

Accepted Answer

The answer of A _________________________ is installed over the service...

Question 16

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.

Accepted Answer

The answer of A(n) ____________________ is a surface on which...

Question 17

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

Accepted Answer

The answer of Explain what a M.L.O. panel is....

Question 18

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

Accepted Answer

The answer of Outgoing electrical power is connected to the...

Question 19

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

Accepted Answer

NEC Section 110.26 requires a minimum working space of 3 feet in front of residential service equipment. This is to ensure that workers have enough space to safely work on the equipment without any obstructions.

Question 20

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.

Accepted Answer

The answer of A/an _________________________________ is a device used to...

Quiz 8: Service Entrance Equipment and Installation