EV LESSON 4 QUESTIONS AND ANSWERS
What is the minimum branch circuit size for a Level II EVSE with a 32-ampere current
rating?
Select one:
a.32 A
b.35 A
c.40 A
d.55 A - Answers-c.40 A
32 A × 1.25 = 40 A minimum OCPD
What is the minimum size XHHW-2 copper conductor permitted to supply a Level II EVSE
that has a 30-ampere current rating, assuming 75° terminations?
Select one:
a.12 AWG
b.10 AWG
c.8 AWG
d.6 AWG - Answers-c.8 AWG
30 A × 1.25 = 37.5 A = 8 AWG
Three single-phase Level II EVSE are distributed equally on a 3-phase, 4-wire system
and each EVSE draws 24 amperes. What is the line current on each phase? (Note: Use
1.732 for the square root of 3.)
Select one:
a.24 A
b.41.56 A
c.52.6 A
d.64.33 A - Answers-b.41.56 A
24 A × 1.732 = 41.56 A per phase
Two Level II EVSE circuits are installed in the same PVC conduit. Each EVSE is served
by a 40-ampere circuit at 240 volts with an EGC run along with the circuits. What size
copper EGC is required for this installation?
Select one:
a.10 AWG
b.8 AWG
c.6 AWG
d.4 AWG - Answers-a.10 AWG
Note: T250.122 - 40A Circuit = 10 AWG CU equipment ground
, Nine Level II EVSEs are installed on a 3-phase, 4-wire 120/208-volt system. Each EVSE
is 208/240 volts, single-phase and rated at 24 amperes. What is the minimum ampacity
of the copper feeder conductors required to serve the installation?
a.90 A
b.156 A
c.167 A
d.180 A - Answers-b.156 A
-24 A × 1.25 = 30 A required for each EVSE3
-units on each phase = 30 A × 3 = 90 A
-Line current needed to find feeder size: 90 A × 1.732 = 156 A per line needed
-156 A = 2/0 Copper
What is the general lighting load of a store with an area of 12,000 square feet?
a.12,000 VA
b.36,000 VA
c.45,000 VA
d.48,000 VA - Answers-b.36,000 VA
12,000 ft2× 3 VA per ft2 = 36,000 VA per Table 220.12
Continuous factors are not needed as actual lighting load is all that is requested.
Correction factors will apply when sizing the branch circuit OCPD and conductors, which
is beyond the question scope.
A 32,000 square foot office building has 120 20-ampere, 120-volt duplex receptacle
outlets. What is the branch circuit receptacle load?
Select one:
a.9,600 VA
b.21,600 VA
c.28,000 VA
d.32,000 VA - Answers-d.32,000 VA
220.14(K) - use largest of either 1 VA per square foot or 180 VA per outlet.
180 VA × 120 = 21,600 VA
32,000 ft2 × 1 VA = 32,000 VA
When calculating the voltage drop on a conductor of a given length, the following values
must be considered: conductor material, conductor length, and conductor operating
temperature.
Select one:
True
False - Answers-True
What is the minimum branch circuit size for a Level II EVSE with a 32-ampere current
rating?
Select one:
a.32 A
b.35 A
c.40 A
d.55 A - Answers-c.40 A
32 A × 1.25 = 40 A minimum OCPD
What is the minimum size XHHW-2 copper conductor permitted to supply a Level II EVSE
that has a 30-ampere current rating, assuming 75° terminations?
Select one:
a.12 AWG
b.10 AWG
c.8 AWG
d.6 AWG - Answers-c.8 AWG
30 A × 1.25 = 37.5 A = 8 AWG
Three single-phase Level II EVSE are distributed equally on a 3-phase, 4-wire system
and each EVSE draws 24 amperes. What is the line current on each phase? (Note: Use
1.732 for the square root of 3.)
Select one:
a.24 A
b.41.56 A
c.52.6 A
d.64.33 A - Answers-b.41.56 A
24 A × 1.732 = 41.56 A per phase
Two Level II EVSE circuits are installed in the same PVC conduit. Each EVSE is served
by a 40-ampere circuit at 240 volts with an EGC run along with the circuits. What size
copper EGC is required for this installation?
Select one:
a.10 AWG
b.8 AWG
c.6 AWG
d.4 AWG - Answers-a.10 AWG
Note: T250.122 - 40A Circuit = 10 AWG CU equipment ground
, Nine Level II EVSEs are installed on a 3-phase, 4-wire 120/208-volt system. Each EVSE
is 208/240 volts, single-phase and rated at 24 amperes. What is the minimum ampacity
of the copper feeder conductors required to serve the installation?
a.90 A
b.156 A
c.167 A
d.180 A - Answers-b.156 A
-24 A × 1.25 = 30 A required for each EVSE3
-units on each phase = 30 A × 3 = 90 A
-Line current needed to find feeder size: 90 A × 1.732 = 156 A per line needed
-156 A = 2/0 Copper
What is the general lighting load of a store with an area of 12,000 square feet?
a.12,000 VA
b.36,000 VA
c.45,000 VA
d.48,000 VA - Answers-b.36,000 VA
12,000 ft2× 3 VA per ft2 = 36,000 VA per Table 220.12
Continuous factors are not needed as actual lighting load is all that is requested.
Correction factors will apply when sizing the branch circuit OCPD and conductors, which
is beyond the question scope.
A 32,000 square foot office building has 120 20-ampere, 120-volt duplex receptacle
outlets. What is the branch circuit receptacle load?
Select one:
a.9,600 VA
b.21,600 VA
c.28,000 VA
d.32,000 VA - Answers-d.32,000 VA
220.14(K) - use largest of either 1 VA per square foot or 180 VA per outlet.
180 VA × 120 = 21,600 VA
32,000 ft2 × 1 VA = 32,000 VA
When calculating the voltage drop on a conductor of a given length, the following values
must be considered: conductor material, conductor length, and conductor operating
temperature.
Select one:
True
False - Answers-True
