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

Question 1

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

A) SJT; SJ
B) dryer; range
C) heavy-duty; extra heavy-duty
D) washer; dryer

Answer 1

B

Question 2

Match the following NEMA designations with the range and dryer plug-and-receptacle types they represent.
a.30-ampere, four-wire
b.50-ampere, four-wire
c.30-ampere, three-wire
d.50-ampere, three-wire
NEMA 14-50

Answer 2

b

Question 3

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

A) 70 percent
B) 80 percent
C) 125 percent
D) none of the above

Answer 3

C

Question 4

Match the following NEMA designations with the range and dryer plug-and-receptacle types they represent.
a.30-ampere, four-wire
b.50-ampere, four-wire
c.30-ampere, three-wire
d.50-ampere, three-wire
NEMA 14-30

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

Question 6

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

A) circuit-breaker in sight of the appliance
B) circuit-breaker or switch capable of being locked in the off position
C) attachment cord and plug
D) horsepower-rated switch

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.

A) 80 percent
B) 100 percent
C) 125 percent
D) none of the above

Question 8

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

Question 9

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

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.

Question 11

Match the following NEMA designations with the range and dryer plug-and-receptacle types they represent.
a.30-ampere, four-wire
b.50-ampere, four-wire
c.30-ampere, three-wire
d.50-ampere, three-wire
NEMA 10-30

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).

A) larger
B) more durable
C) longer
D) tarnish-resistant

Question 13

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

Question 14

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

A) be horsepower-rated
B) interrupt all ungrounded circuit conductors
C) have a NEMA 3R enclosure when installed outdoors
D) both a and b

Question 15

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

A) NEMA 30; NEMA 50
B) twist-lock; locking
C) dryer; range
D) none of the above

Question 16

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

A) the maximum amount possible
B) the ampacity of the branch-circuit conductors supplying the appliance
C) 30 amperes maximum
D) none of the above

Question 17

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

A) the appliance rating in volts and amperes
B) the appliance connected load in volts and watts
C) the appliance branch circuit conductor size
D) either a or b

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?

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.

Question 20

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

Question 21

Match the following NEMA designations with the range and dryer plug-and-receptacle types they represent.
a.30-ampere, four-wire
b.50-ampere, four-wire
c.30-ampere, three-wire
d.50-ampere, three-wire
NEMA 10-50

Question 22

Match the following types of range-dryer terminal and receptacle connectors with the types of conductor they are to be connected to.
a.Phase (hot) conductors
b.Grounded (neutral) conductor
c.Equipment grounding conductor
black/red

Question 23

Match the following types of range-dryer terminal and receptacle connectors with the types of conductor they are to be connected to.
a.Phase (hot) conductors
b.Grounded (neutral) conductor
c.Equipment grounding conductor
green

Question 24

Match the following types of range-dryer terminal and receptacle connectors with the types of conductor they are to be connected to.
a.Phase (hot) conductors
b.Grounded (neutral) conductor
c.Equipment grounding conductor
white