Question 1

What are service lateral conductors?

Accepted Answer

If installed by the electric utility, the conductors installed between the pad-mounted transformer and the meter are called service lateral conductors.

Question 2

Using an electric rate of $0.07824 per kWh, calculate the cost of running ten 100W lamps for six hours.

Accepted Answer

Cost = watts × hours used × cost per kWh/1000
10 lamps at 100W = 1,000W
  46.9¢

Question 3

A panelboard must not be installed in a(n) ____________________.

Accepted Answer

bathroom

Question 4

If extra support is not to be provided, the mast service conduit must be at least ____ in. in diameter.

Accepted Answer

According to the National Electrical Code (NEC), if extra support is not provided, the minimum diameter of the mast service conduit should be 2 inches. This is because a larger conduit diameter provides better protection for the electrical cables and conductors inside, especially in areas with high wind or other environmental factors that can cause damage.

Question 5

When using a metal water pipe as a grounding electrode, a(n) ____________________ is required.

Accepted Answer

The answer of When using a metal water pipe as...

Question 6

A main service disconnect shall not be installed in a ____.

Accepted Answer

A main service disconnect shall not be installed in a bathroom due to the potential hazard of electrical shock.

Question 7

Under no circumstances shall the service entrance conductors be less than ____ ft. above finished grade.

Accepted Answer

According to the National Electrical Code (NEC) 230.24, the service entrance conductors should be at least 10 ft. above finished grade to reduce the risk of accidental contact with the conductors by individuals or vehicles.

Question 8

A working space not less than ____ in. wide and 3 ft deep must be provided in front of electrical equipment, such as panelboards A and B in this residence.

Accepted Answer

The National Electrical Code (NEC) requires a minimum working space width of 30 inches wide (or the width of the equipment, whichever is greater) in front of electrical equipment such as panelboards, to ensure safety and accessibility for maintenance and inspection.

Question 9

NEC 300.4(F) states that if ____ AWG or larger ungrounded circuit conductors enter a cabinet, box enclosure or raceway, an insulating bushing or equivalent must be used.

Accepted Answer

NEC 300.4(F) specifies that an insulating bushing or equivalent is required when 4 AWG or larger ungrounded circuit conductors enter a cabinet, box enclosure, or raceway, to protect the conductors from damage.

Question 10

____________________ conductors are permitted to be attached to and supported by the service mast.

Accepted Answer

The answer of ____________________ conductors are permitted to be attached...

Question 11

For a one-family residence, the minimum size main service disconnecting means is ____ three-wire.

Accepted Answer

According to the National Electrical Code (NEC) 230.79, the minimum rating for a main service disconnecting means for a one-family dwelling is 100 amperes. Furthermore, the NEC requires that the service disconnecting means be either a "three-wire" or "four-wire" type, depending on the specific installation. Therefore, the minimum size main service disconnecting means for a one-family residence is 100-ampere three-wire.

Question 12

A 4 AWG bare copper conductor at least 20 ft (6.0 m) long installed identically to the steel reinforcing rod is also permitted as a concrete-encased grounding electrode. This is often referred to as a(n) ____________________ ground.

Accepted Answer

The answer of A 4 AWG bare copper conductor at...

Question 13

For typical residential wiring, the grounding electrode conductor is run between the ____________________ neutral/ground terminal bar and the grounding electrode system.

Accepted Answer

The answer of For typical residential wiring, the grounding electrode...

Question 14

An exterior raceway containing service entrance conductors must be ____________________ and arranged to drain.

Accepted Answer

The answer of An exterior raceway containing service entrance conductors...

Question 15

Bonding at service-entrance equipment is very important because service-entrance conductors do not have ____________________ at their line side, other than the electric utility company's primary transformer fuses.

Accepted Answer

The answer of Bonding at service-entrance equipment is very important...

Question 16

It is extremely important that a disconnect or panelboard used as service equipment be marked "____________________."

Accepted Answer

The answer of It is extremely important that a disconnect...

Question 17

NEC ____________________ provides rules for working space around electrical equipment.

Accepted Answer

The answer of NEC ____________________ provides rules for working space...

Question 18

Ground clamps used for bonding and grounding must be ____.

Accepted Answer

Ground clamps used for bonding and grounding must be listed for the purpose to ensure that they have been tested and proven to meet the necessary safety standards. Copper or steel material is not necessarily required, as there are other materials that may be used depending on the specific application and environment. However, the clamp must be approved and listed for the intended use.

Question 19

Ground rods must be at least ____ ft. in length

Accepted Answer

Ground rods are required to be at least 8 feet in length according to the National Electrical Code (NEC) standards for a proper grounding system.

Question 20

What is a service drop?

Accepted Answer

The answer of What is a service drop?...

Quiz 27: Service-Entrance Equipment