EV Lesson 4 – Electric Vehicles – Lecture Summary
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 - ANS ✔✔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 - ANS ✔✔c.8 AWG
30 A × 1.25 = 37.5 A = 8 AWG
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 - ANS ✔✔True
, Calculate the voltage drop on a single-phase circuit with 32 amperes of load, a distance of 320
feet from the load to the panelboard, and served by 8 AWG copper THHN conductors.
Select one:
a.13 V
b.14 V
c.15 V
d.16 V - ANS ✔✔d.16 V
2KIL / A = VD(2) × 12.9 × 32A × 320' / 16,510 cmil = 16 V
Calculate the following correct copper conductor size so that the branch circuit has a maximum
voltage drop of 2%. The load on the circuit is 32 amperes, the distance from the load to the
panelboard is 400 feet, and the circuit is 208 volts, single-phase.
a.3 AWG
b.1 AWG
c.1/0 AWG
d.250 kcmil - ANS ✔✔b.1 AWG
2% × 208 V = 4.16 V
2 KIL / VD = A
2 × 12.9 × 32 A × 400' / 4.16 V =
79,384.6 cmil =
1 AWG
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 - ANS ✔✔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 - ANS ✔✔c.8 AWG
30 A × 1.25 = 37.5 A = 8 AWG
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 - ANS ✔✔True
, Calculate the voltage drop on a single-phase circuit with 32 amperes of load, a distance of 320
feet from the load to the panelboard, and served by 8 AWG copper THHN conductors.
Select one:
a.13 V
b.14 V
c.15 V
d.16 V - ANS ✔✔d.16 V
2KIL / A = VD(2) × 12.9 × 32A × 320' / 16,510 cmil = 16 V
Calculate the following correct copper conductor size so that the branch circuit has a maximum
voltage drop of 2%. The load on the circuit is 32 amperes, the distance from the load to the
panelboard is 400 feet, and the circuit is 208 volts, single-phase.
a.3 AWG
b.1 AWG
c.1/0 AWG
d.250 kcmil - ANS ✔✔b.1 AWG
2% × 208 V = 4.16 V
2 KIL / VD = A
2 × 12.9 × 32 A × 400' / 4.16 V =
79,384.6 cmil =
1 AWG
