Question 1

Cord sets rated 30 amperes are usually called ____ cords, and cord sets rated 40, 45, or 50 amperes are called ____ cords.

Accepted Answer

Cord sets rated 30 amperes are typically referred to as dryer cords, while those rated 40, 45, or 50 amperes are known as range cords, reflecting their common applications with dryers and kitchen ranges, respectively.

Question 2

Match the following NEMA designations with the range and dryer plug-and-receptacle types they represent.
-NEMA 14-50

Accepted Answer

NEMA 14-50 refers to a 50-ampere, four-wire plug-and-receptacle type, which is commonly used for ranges and dryers.

Question 3

A feeder or service neutral load can be figured at ____ of the load on the ungrounded conductors for ranges and ovens.

Accepted Answer

C

Question 4

Match the following NEMA designations with the range and dryer plug-and-receptacle types they represent.
-NEMA 14-30

Accepted Answer

NEMA 14-30 is a 30-ampere, four-wire plug-and-receptacle type commonly used for electric ranges and dryers.

Question 5

Calculate the overcurrent protection needed for a countertop cooking unit rated 7,450 watts, 120/240 volts.
Use nameplate rating per Table 220.55, Note 4.
I = W/E = 7,450/240 = 31.04 amperes

Accepted Answer

The answer of Calculate the overcurrent protection needed for a...

Question 6

A(n) ____ is NOT an acceptable disconnecting means for appliances.

Accepted Answer

Horsepower-rated switches are specifically designed to handle the inrush current of motors without damage and are not typically used as a disconnecting means for general appliances. Choices A, B, and C are all acceptable forms of disconnecting means according to electrical codes and standards.

Question 7

When a separate branch-circuit is run to a wall-mounted oven or to a counter-mounted cooking unit, the branch circuit size is based on ____ of the nameplate rating of the appliance.

Accepted Answer

The branch circuit size for a wall-mounted oven or counter-mounted cooking unit is based on 100 percent of the nameplate rating of the appliance, according to the National Electrical Code (NEC).

Question 8

Unit switches that have a(n) ____________________ are acceptable as the disconnecting means for that appliance.

Accepted Answer

The answer of Unit switches that have a(n) ____________________ are...

Question 9

NEC ____________________ states that the branch circuit overcurrent protection shall not exceed the rating marked on the appliance.

Accepted Answer

The answer of NEC ____________________ states that the branch circuit...

Question 10

For electric ranges that have a computer demand of 8.75 kW or more, the neutral conductor can be reduced to not less than ____________________ percent of the branch-circuit rating but never smaller than ____________________ AWG.

Accepted Answer

The answer of For electric ranges that have a computer...

Question 11

Match the following NEMA designations with the range and dryer plug-and-receptacle types they represent.
-NEMA 10-30

Accepted Answer

NEMA 10-30 represents a 30-ampere, three-wire plug-and-receptacle type commonly used for electric ranges and dryers. It is a three-wire system with two hot wires and one neutral wire, but no separate ground wire. This type of plug-and-receptacle is not recommended for new installations as it does not provide a separate ground, which can be a safety hazard.

Question 12

On all types and ratings of receptacles, the grounding blade is ____ than the others to ensure that it makes its connection before the grounded conductors do and breaks its connection after they do (first make-last break).

Accepted Answer

The grounding blade is longer than the other blades on a receptacle to ensure that it makes its connection before the other blades and breaks its connection after them. This is known as first make-last break and is designed to prevent electrical shock hazards. The other options (larger, more durable, tarnish-resistant) may also be features of grounding blades, but they are not the main reason why the grounding blade is longer.

Question 13

For free-standing electric ranges, Table 220.55 permits the ____________________ load to be considerably less than the connected load.

Accepted Answer

The answer of For free-standing electric ranges, Table 220.55 permits...

Question 14

A "unit switch" used as a disconnecting means for an appliance shall ____.

Accepted Answer

The answer of A "unit switch" used as a disconnecting...

Question 15

Receptacles rated 30 amperes are referred to as ____ receptacles, and receptacles rated 50 amperes are called ____ receptacles.

Accepted Answer

Receptacles rated 30 amperes are commonly used for dryers and thus referred to as "dryer" receptacles, while those rated 50 amperes are typically used for electric ranges, hence called "range" receptacles.

Question 16

For appliances that have no marked maximum overcurrent protection, the branch-circuit overcurrent protection is sized at ____.

Accepted Answer

The branch-circuit overcurrent protection must be sized at the ampacity of the branch-circuit conductors supplying the appliance. This is in accordance with NEC 210.20(A) which states that "Each branch circuit shall be protected by overcurrent protective devices having a rating or setting that complies with 210.20(A) through (D) and the specific requirements elsewhere in this Code for the type of branch circuit."

Question 17

NEC 422.60(A) requires that an appliance nameplate show ____.

Accepted Answer

NEC 422.60(A) requires that an appliance nameplate show either the appliance rating in volts and amperes or the appliance connected load in volts and watts. It does not require the appliance branch circuit conductor size to be shown on the nameplate.

Question 18

In Table 220.55, what is the rationale for allowing demand factors for electric ranges but not for wall-mounted ovens or individual counter-mounted cooking units?

Accepted Answer

The answer of In Table 220.55, what is the rationale...

Question 19

According to NEC, the total load of a cord-and-plug connected range or cooktop cannot exceed ____________________ percent of the rating of the branch circuit.

Accepted Answer

The answer of According to NEC, the total load of...

Question 20

Name at least two different methods for connecting electric ranges, ovens, and cook tops.

Accepted Answer

The answer of Name at least two different methods for...

Quiz 20: Special-Purpose Outlets for Ranges, Counter-Mounted Cooking Unit G, and Wall-Mounted Oven F

Cord sets rated 30 amperes are usually called cords, and cord sets rated 40, 45, or 50 amperes are called cords.

Match the following NEMA designations with the range and dryer plug-and-receptacle types they represent. -NEMA 14-50

A feeder or service neutral load can be figured at ____ of the load on the ungrounded conductors for ranges and ovens.

Match the following NEMA designations with the range and dryer plug-and-receptacle types they represent. -NEMA 14-30

Calculate the overcurrent protection needed for a countertop cooking unit rated 7,450 watts, 120/240 volts. Use nameplate rating per Table 220.55, Note 4. I = W/E = 7,450/240 = 31.04 amperes