228.2 UPDATED ACTUAL QUESTIONS AND CORRECT
ANSWERS
Question:
1. A 5-gang box and a partition are shown above in Figure 210.5. The box will
contain single-pole switches A, B, C, D & E that are fed from the following circuits
that originate in a 277/480-volt, 3Ø, 4-wire panelboard:
Switches A and B are fed from Circuit 1
Switches C and D are fed from Circuit 7
Switch E is fed from Circuit 10
The NEC® requires that partitions be installed between switches ___.I. A & B II. B &
C III. C & D IV. D & E
Answer:
IV only
Question:
2. grounded
Answer:
For lighting circuits, NEC® Section 404.2(C) requires a(n) ___ conductor to be
provided in each switch box or enclosure.
Question:
3. Refer to Figure 210.19. If the incoming service is 120/208, the NEC® permits the
panelboard to be rated for ___ volts.
I. 250
II. 600
Answer:
either I or II
, Question:
4. The receptacle, shown at II in Figure 211.9, will be installed in a metal box. The box
will be connected to the panelboard with PVC. The minimum number of
conductors that are required to be pulled into the PVC is ___.
Answer:
four
Question:
5. both I and II
Answer:
If a common-trip 2-pole breaker is used for a 1Ø, 208-volt circuit, ___. I. both "hots"
will open when a short circuit or ground fault occursII. both "hots" can be
manually opened
Question:
6. Where (snap) switches are installed in multigang boxes without permanent
barriers (partitions) the maximum voltage between adjacent switches is ___ volts.
Answer:
300
Question:
7. I, II, and III
Answer:
The phase arrangement on 3-phase buses shall be A, B, C from ___, as viewed from
the front of the switchboard or panelboard.
I. front to back
II. top to bottom
III. left to right
Question:
8. B
Answer:
A switchboard is fed from a 3-phase, 4-wire, delta-connected system. The ___
phase shall be the phase having the higher voltage to ground.
ANSWERS
Question:
1. A 5-gang box and a partition are shown above in Figure 210.5. The box will
contain single-pole switches A, B, C, D & E that are fed from the following circuits
that originate in a 277/480-volt, 3Ø, 4-wire panelboard:
Switches A and B are fed from Circuit 1
Switches C and D are fed from Circuit 7
Switch E is fed from Circuit 10
The NEC® requires that partitions be installed between switches ___.I. A & B II. B &
C III. C & D IV. D & E
Answer:
IV only
Question:
2. grounded
Answer:
For lighting circuits, NEC® Section 404.2(C) requires a(n) ___ conductor to be
provided in each switch box or enclosure.
Question:
3. Refer to Figure 210.19. If the incoming service is 120/208, the NEC® permits the
panelboard to be rated for ___ volts.
I. 250
II. 600
Answer:
either I or II
, Question:
4. The receptacle, shown at II in Figure 211.9, will be installed in a metal box. The box
will be connected to the panelboard with PVC. The minimum number of
conductors that are required to be pulled into the PVC is ___.
Answer:
four
Question:
5. both I and II
Answer:
If a common-trip 2-pole breaker is used for a 1Ø, 208-volt circuit, ___. I. both "hots"
will open when a short circuit or ground fault occursII. both "hots" can be
manually opened
Question:
6. Where (snap) switches are installed in multigang boxes without permanent
barriers (partitions) the maximum voltage between adjacent switches is ___ volts.
Answer:
300
Question:
7. I, II, and III
Answer:
The phase arrangement on 3-phase buses shall be A, B, C from ___, as viewed from
the front of the switchboard or panelboard.
I. front to back
II. top to bottom
III. left to right
Question:
8. B
Answer:
A switchboard is fed from a 3-phase, 4-wire, delta-connected system. The ___
phase shall be the phase having the higher voltage to ground.
