Question 1

GFPE monitors are designed to sense faults only.

Accepted Answer

GFPE (Ground Fault Protection Equipment) monitors are specifically designed to detect faults in the electrical system from the phase-to-ground. They operate similarly to GFCIs (Ground Fault Circuit Interrupters) but have a different purpose and typically protect larger areas or systems. They do not sense phase-to-phase, 3-phase or phase-to-neutral faults.

Question 2

GFCI protection can be attained using GFCI circuit breakers or GFCI .

Accepted Answer

GFCI protection is most commonly achieved using GFCI receptacles, which replace standard electrical outlets and monitor the flow of electricity to detect any imbalances that could indicate a hazard. GFCI circuit breakers can also be used to provide protection for an entire circuit, but they are typically more expensive and harder to install than GFCI receptacles. Switchboards, monitors, and fuses are not typically used for GFCI protection.

Question 3

The connection scheme has the advantage of being able to provide either 3-phase or 3-phase and single-phase power using only two transformers.

Accepted Answer

The open delta connection scheme allows for both 3-phase or 3-phase and single-phase power to be provided using only two transformers, making it a versatile and cost-effective option for power distribution.

Question 4

When is ground-fault protection of equipment not required?

Accepted Answer

The answer of When is ground-fault protection of equipment not...

Question 5

NEC 110.16 has a requirement for placing a notice on certain equipment to warn qualified persons of the serious hazard of flash events.

Accepted Answer

NEC 110.16 requires a notice to be placed on equipment that poses an arc flash hazard, warning qualified persons of the serious hazard of flash events. The notice should indicate the potential energy level and require the use of personal protective equipment (PPE) when working on the equipment.

Question 6

The temperatures of an electrical arc, such as might occur on a 480/277-volt solidly grounded, wye-connected system, are .

Accepted Answer

Electrical arcs can reach temperatures of up to 35,000 degrees Fahrenheit, which is hotter than the surface of the sun. These temperatures can easily melt metals and are extremely dangerous for humans.

Question 7

Dry-type transformers are widely used because they are than comparably rated liquid-filled transformers.

Accepted Answer

Dry-type transformers are generally lighter in weight compared to liquid-filled transformers because they do not require a liquid coolant.

Question 8

What liquid was used in the past in liquid-filled transformers? Is it still in use?

Accepted Answer

The answer of What liquid was used in the past...

Question 9

When and how does primary high-voltage metering take place?

Accepted Answer

The answer of When and how does primary high-voltage metering...

Question 10

Throughout this country, and for that matter, throughout the world, is(are) the common reference point for all electrical systems.

Accepted Answer

The earth serves as the common reference point, or ground, for all electrical systems. This is because the earth has a virtually zero potential and can thus absorb excess electrical charges or provide a return path for electrical currents. A standard metal plate or individual building walls may be used as grounding electrodes, but they ultimately connect to the earth to serve as the reference point. The atmosphere is not a suitable reference point as it is highly variable in its electrical properties.

Question 11

occur when an ungrounded "hot" conductor comes in contact with a grounded surface or grounded equipment.

Accepted Answer

Ground faults occur when an ungrounded "hot" conductor comes in contact with a grounded surface or grounded equipment. Circuit breakings and arc blasts are not directly related to this scenario, and groundings refer to intentionally connecting a conductor to ground as a safety measure.

Question 12

What is an effective ground-fault current path?

Accepted Answer

The answer of What is an effective ground-fault current path?...

Question 13

What are the advantages of proper bonding and grounding?

Accepted Answer

The answer of What are the advantages of proper bonding...

Question 14

NEC 230.71 permits not more than disconnects to serve as the building disconnecting means.

Accepted Answer

NEC 230.71 states that no more than six disconnecting means shall be permitted to be used in order to achieve the building disconnecting means.

Question 15

Utilities make up the connections on the line side and load side of their transformers according to the requirements.

Accepted Answer

The National Electrical Safety Code (NESC) provides guidelines for the design, installation, and operation of electric supply and communication utility systems, including transformer connections. The NFPA (National Fire Protection Association) provides guidelines for fire safety, UL (Underwriters Laboratories) provides certification for electrical equipment, and TEK is not a recognized organization in the electrical industry.

Question 16

The two basic methods of metering are primary high-voltage metering and .

Accepted Answer

The two basic methods of metering are primary high-voltage metering and low-voltage metering. Low-voltage metering is used for smaller, more localized applications, contrasting with primary high-voltage metering which is used for measuring electricity flow in high-voltage transmission lines.

Question 17

NEC 250.64(C) states that grounding electrode conductors generally are not permitted to be .

Accepted Answer

NEC 250.64(C) states that grounding electrode conductors generally are not permitted to be spliced, except as allowed by 250.64(E). This is because splices can create points of potential failure and can impede proper grounding and bonding.

Question 18

Today's liquid­filled transformers have their windings immersed in highly refined mineral oil (combustible), silicone fluid, edible seed oil-based dielectric coolant, or other acceptable nontoxic liquids that have properties.

Accepted Answer

The best choice among the given properties is high dielectric, as it helps in insulating the windings and preventing electrical breakdown. The other properties are not desirable for this application.

Question 19

The is defined in NEC Article 100 as the point of connection between the facilities of the serving utility and the premises wiring.

Accepted Answer

The definition given in NEC Article 100 clearly describes the service point as the point of connection between the utility's facilities and the premises wiring. The other options are not relevant to the definition given.

Question 20

The lower the of the grounding path, the greater the ground-fault current.

Accepted Answer

The ground-fault current is inversely proportional to the impedance of the grounding path; lower impedance allows more current to flow.

Quiz 13: The Electric Service

GFPE monitors are designed to sense faults only.

GFCI protection can be attained using GFCI circuit breakers or GFCI .

The connection scheme has the advantage of being able to provide either 3-phase or 3-phase and single-phase power using only two transformers.

When is ground-fault protection of equipment not required?

NEC 110.16 has a requirement for placing a notice on certain equipment to warn qualified persons of the serious hazard of flash events.

The temperatures of an electrical arc, such as might occur on a 480/277-volt solidly grounded, wye-connected system, are .

Dry-type transformers are widely used because they are than comparably rated liquid-filled transformers.

What liquid was used in the past in liquid-filled transformers? Is it still in use?

When and how does primary high-voltage metering take place?

Throughout this country, and for that matter, throughout the world, is(are) the common reference point for all electrical systems.

occur when an ungrounded "hot" conductor comes in contact with a grounded surface or grounded equipment.

What is an effective ground-fault current path?

What are the advantages of proper bonding and grounding?

NEC 230.71 permits not more than disconnects to serve as the building disconnecting means.

Utilities make up the connections on the line side and load side of their transformers according to the requirements.

The two basic methods of metering are primary high-voltage metering and .

NEC 250.64(C) states that grounding electrode conductors generally are not permitted to be .

Today's liquidfilled transformers have their windings immersed in highly refined mineral oil (combustible) , silicone fluid, edible seed oil-based dielectric coolant, or other acceptable nontoxic liquids that have properties.

The is defined in NEC Article 100 as the point of connection between the facilities of the serving utility and the premises wiring.

The lower the of the grounding path, the greater the ground-fault current.

Quiz 13: The Electric Service

GFPE monitors are designed to sense faults only.

GFCI protection can be attained using GFCI circuit breakers or GFCI .

The connection scheme has the advantage of being able to provide either 3-phase or 3-phase and single-phase power using only two transformers.

When is ground-fault protection of equipment not required?

NEC 110.16 has a requirement for placing a notice on certain equipment to warn qualified persons of the serious hazard of flash events.

The temperatures of an electrical arc, such as might occur on a 480/277-volt solidly grounded, wye-connected system, are .

Dry-type transformers are widely used because they are than comparably rated liquid-filled transformers.

What liquid was used in the past in liquid-filled transformers? Is it still in use?

When and how does primary high-voltage metering take place?

Throughout this country, and for that matter, throughout the world, is(are) the common reference point for all electrical systems.

occur when an ungrounded "hot" conductor comes in contact with a grounded surface or grounded equipment.

What is an effective ground-fault current path?

What are the advantages of proper bonding and grounding?

NEC 230.71 permits not more than disconnects to serve as the building disconnecting means.

Utilities make up the connections on the line side and load side of their transformers according to the requirements.

The two basic methods of metering are primary high-voltage metering and .

NEC 250.64(C) states that grounding electrode conductors generally are not permitted to be .

Today's liquid­filled transformers have their windings immersed in highly refined mineral oil (combustible) , silicone fluid, edible seed oil-based dielectric coolant, or other acceptable nontoxic liquids that have properties.

The is defined in NEC Article 100 as the point of connection between the facilities of the serving utility and the premises wiring.

The lower the of the grounding path, the greater the ground-fault current.

Today's liquidfilled transformers have their windings immersed in highly refined mineral oil (combustible) , silicone fluid, edible seed oil-based dielectric coolant, or other acceptable nontoxic liquids that have properties.