IEC 3A TEST BANK QUESTIONS
AND CORRECT ANSWERS
(VERIFIED ANSWERS) ALREADY
PASSED
When an isolated ground receptacle is installed in a metal box, a(n) ___ equipment
grounding conductor is required for connection to the metal box.
Select one:
a.separate
b.bare copper
c.oversized
d.insulated - 2020 NEC: 250.96(B)
The correct answer is: separate
The equipment grounding conductor is permitted to be run separately from the circuit
conductors when ___.
Select one:
a.installed in industrial establishments only
b.the equipment grounding conductor has the same insulation as the circuit conductors
c.a nongrounded-type receptacle is replaced
d.the branch circuit is less than 30 amperes - 2020 NEC: 250.130(C)
The correct answer is: a nongrounded-type receptacle is replaced
Which of the following receptacles are required to be GFCI protected? I. where installed
in a patient's room in a hospital II. where installed on the exterior wall (outdoors) of an
elementary schoolIII. where installed adjacent to (2 feet away from) a sink in a bar -
2020 NEC: 210.8(B)(4) | 2020 NEC: 210.8(B)(5)
The correct answer is: II & III only
Which of the following receptacles are required to be GFCI protected?I. where installed
outside on the exterior wall of a restaurantII. where installed on the wall at 18" AFF
(NOT above a countertop) in the kitchen at a restaurantIII. where installed on the
exterior wall (outdoors) of an elementary school
Select one:
a.II only
b.I, II & III
c.I only
d.II & III only
e.III only - 2020 NEC: 210.8(B)
,The correct answer is: I, II & III
Type MC cable is available with two grounding conductors. One of these is green and
the second one is green with ___ stripes.
Select one:
a.white
b.red
c.yellow
d.none of these - The correct answer is: yellow
Ground-fault circuit interrupters are designed to trip at current levels above ___.
Select one:
a.10 mA
b.6 A
c.6 mA
d.20 A
e.4 A - 2020 NEC: 100_Ground-Fault Circuit Interrupter I-Note
The correct answer is: 6 mA
Although protected with a GFCI breaker, a person could still feel a shock.
Select one:
a.True
b.False - The correct answer is: True
Equipment grounding conductors installed in raceways for isolated ground receptacles
are required to ___.
Select one:
a.be continuous, without joints or splices
b.be copper
c.be insulated
d.have green insulation without stripes
e.all of these - 2020 NEC: 250.96(B)
The correct answer is: be insulated
Two 20-amp, 120-volt GFCI breakers are installed in spaces 8 & 10 in a 120/240-volt
1Ø, 3-wire panel. These two circuits will be installed in one conduit. You must install at
least ___ neutral(s) in the conduit.
Select one:
a.1
b.2
c.3
d.0 - The correct answer is: 2
A conduit system of PVC and RMC was installed in the slab between the bottom of the
panel and a metal switch box in the wall. A 15-amp branch circuit (including a "hot," a
neutral, an EGC, and an isolated grounding conductor) was installed in the PVC/RMC.
,The receptacle shown here was connected and installed in the metal switch box and a
stainless steel cover was installed on the receptacle.Figure 309.71
Refer to Figure 309.71. Using a voltmeter on the energized receptacle, your meter
would indicate ___ volts, if the leads were connected between point C and the metal
cover. - The correct answer is: 120
A conduit system of PVC and RMC was installed in the slab between the bottom of the
panel and a metal switch box in the wall. A 15-amp branch circuit (including a "hot," a
neutral, an EGC, and an isolated grounding conductor) was installed in the PVC/RMC.
The receptacle shown here was connected and installed in the metal switch box and a
stainless steel cover was installed on the receptacle.Figure 309.71
Refer to Figure 309.71. Using a voltmeter on the energized receptacle, your meter
would indicate ___ volts if the leads were connected between points A and C. - The
correct answer is: 120
Refer to Figure 308.22. Only one EGC will be installed in the EMT between the panel
and the metal pull box. Splices will be made at the ground bar in the pull box to drop an
EGC to each load. Does the NEC® require the insulated ground bar to be connected to
the metal pull box?
Select one:
a.Yes
b.No - 2020 NEC: 250.148(C)
The correct answer is: Yes
A separate water piping bonding jumper ___ required where the metal frame of a
building or structure is used as the grounding electrode for a separately derived system
and is bonded to the metal water piping in the area served by the separately derived
system.
Select one:
a.shall not be
b.shall be - 2020 NEC: 250.104(D)(1) Exc 2
The correct answer is: shall not be
Where used in a corrosive environment at a wastewater treatment plant, ___ equipment
bonding jumpers are permitted.I. aluminum II. copper
Select one:
a.I only
b.II only
c.either I or - 2020 NEC: 250.102(A)
The correct answer is: II only
For Figure 309.73, a meter would indicate ___ ohms between points B and C.
Select one:
a.∞ (or OL on a digital meter)
b.0 - The correct answer is: 0
, For Figure 309.73, a meter would indicate ___ ohms between points A and C.
Select one:
a.∞ (or OL on a digital meter)
b.0 - The correct answer is: ∞ (or OL on a digital meter)
Which of these box-receptacle combinations require(s) the installation of a grounding
jumper (pigtail) from the receptacle to the box? All boxes and conduits are metal.
Separate EGCs were NOT installed with these circuits.I. a receptacle installed on a
surface-mounted "bell" box where both washers were removed from the receptacle
mounting screwsII. a self-grounding receptacle mounted on a switch box that is set back
in the sheetrock wall not more than 1/ 4 inch where the washer was removed from the
receptacle mounting screwsIII. a receptacle on a surface-mounted handy box where
both washers were removed from the receptacle mounting screws
Select one:
a.I only
b.I, II & III
c.I & III only
d.II only
e.none of these - 2020 NEC: 250.146
The correct answer is: none of these
To apply the exception to NEC® 250.140, the existing wiring method to a 120/240-volt
range can be ___.I. 8-2 with ground Type NM cableII. 8-3 (without ground) Type NM
cableIII. 8-3 Type SE cable (all three conductors insulated)
Select one:
a.III only
b.II or III only
c.I or II only
d.I, II or III - 2020 NEC: 250.140 Exc
The correct answer is: II or III only
Section ___ of the NEC® permits the equipment grounding conductor used as an
isolated grounding conductor to pass through a metal box without being connected to
the box.
Select one:
a.250.149
b.250.148
c.250.146
d.250.66 - 2020 NEC: 250.146(D)
The correct answer is: 250.146
Four metal 4"-Square boxes with 1-gang metal plaster rings are roughed into a wall that
will be covered with sheetrock. The plaster rings are 1/2" rise and the sheetrock is 5/8".
Self-grounding 120-volt duplex receptacles are to be installed at each box. The home
AND CORRECT ANSWERS
(VERIFIED ANSWERS) ALREADY
PASSED
When an isolated ground receptacle is installed in a metal box, a(n) ___ equipment
grounding conductor is required for connection to the metal box.
Select one:
a.separate
b.bare copper
c.oversized
d.insulated - 2020 NEC: 250.96(B)
The correct answer is: separate
The equipment grounding conductor is permitted to be run separately from the circuit
conductors when ___.
Select one:
a.installed in industrial establishments only
b.the equipment grounding conductor has the same insulation as the circuit conductors
c.a nongrounded-type receptacle is replaced
d.the branch circuit is less than 30 amperes - 2020 NEC: 250.130(C)
The correct answer is: a nongrounded-type receptacle is replaced
Which of the following receptacles are required to be GFCI protected? I. where installed
in a patient's room in a hospital II. where installed on the exterior wall (outdoors) of an
elementary schoolIII. where installed adjacent to (2 feet away from) a sink in a bar -
2020 NEC: 210.8(B)(4) | 2020 NEC: 210.8(B)(5)
The correct answer is: II & III only
Which of the following receptacles are required to be GFCI protected?I. where installed
outside on the exterior wall of a restaurantII. where installed on the wall at 18" AFF
(NOT above a countertop) in the kitchen at a restaurantIII. where installed on the
exterior wall (outdoors) of an elementary school
Select one:
a.II only
b.I, II & III
c.I only
d.II & III only
e.III only - 2020 NEC: 210.8(B)
,The correct answer is: I, II & III
Type MC cable is available with two grounding conductors. One of these is green and
the second one is green with ___ stripes.
Select one:
a.white
b.red
c.yellow
d.none of these - The correct answer is: yellow
Ground-fault circuit interrupters are designed to trip at current levels above ___.
Select one:
a.10 mA
b.6 A
c.6 mA
d.20 A
e.4 A - 2020 NEC: 100_Ground-Fault Circuit Interrupter I-Note
The correct answer is: 6 mA
Although protected with a GFCI breaker, a person could still feel a shock.
Select one:
a.True
b.False - The correct answer is: True
Equipment grounding conductors installed in raceways for isolated ground receptacles
are required to ___.
Select one:
a.be continuous, without joints or splices
b.be copper
c.be insulated
d.have green insulation without stripes
e.all of these - 2020 NEC: 250.96(B)
The correct answer is: be insulated
Two 20-amp, 120-volt GFCI breakers are installed in spaces 8 & 10 in a 120/240-volt
1Ø, 3-wire panel. These two circuits will be installed in one conduit. You must install at
least ___ neutral(s) in the conduit.
Select one:
a.1
b.2
c.3
d.0 - The correct answer is: 2
A conduit system of PVC and RMC was installed in the slab between the bottom of the
panel and a metal switch box in the wall. A 15-amp branch circuit (including a "hot," a
neutral, an EGC, and an isolated grounding conductor) was installed in the PVC/RMC.
,The receptacle shown here was connected and installed in the metal switch box and a
stainless steel cover was installed on the receptacle.Figure 309.71
Refer to Figure 309.71. Using a voltmeter on the energized receptacle, your meter
would indicate ___ volts, if the leads were connected between point C and the metal
cover. - The correct answer is: 120
A conduit system of PVC and RMC was installed in the slab between the bottom of the
panel and a metal switch box in the wall. A 15-amp branch circuit (including a "hot," a
neutral, an EGC, and an isolated grounding conductor) was installed in the PVC/RMC.
The receptacle shown here was connected and installed in the metal switch box and a
stainless steel cover was installed on the receptacle.Figure 309.71
Refer to Figure 309.71. Using a voltmeter on the energized receptacle, your meter
would indicate ___ volts if the leads were connected between points A and C. - The
correct answer is: 120
Refer to Figure 308.22. Only one EGC will be installed in the EMT between the panel
and the metal pull box. Splices will be made at the ground bar in the pull box to drop an
EGC to each load. Does the NEC® require the insulated ground bar to be connected to
the metal pull box?
Select one:
a.Yes
b.No - 2020 NEC: 250.148(C)
The correct answer is: Yes
A separate water piping bonding jumper ___ required where the metal frame of a
building or structure is used as the grounding electrode for a separately derived system
and is bonded to the metal water piping in the area served by the separately derived
system.
Select one:
a.shall not be
b.shall be - 2020 NEC: 250.104(D)(1) Exc 2
The correct answer is: shall not be
Where used in a corrosive environment at a wastewater treatment plant, ___ equipment
bonding jumpers are permitted.I. aluminum II. copper
Select one:
a.I only
b.II only
c.either I or - 2020 NEC: 250.102(A)
The correct answer is: II only
For Figure 309.73, a meter would indicate ___ ohms between points B and C.
Select one:
a.∞ (or OL on a digital meter)
b.0 - The correct answer is: 0
, For Figure 309.73, a meter would indicate ___ ohms between points A and C.
Select one:
a.∞ (or OL on a digital meter)
b.0 - The correct answer is: ∞ (or OL on a digital meter)
Which of these box-receptacle combinations require(s) the installation of a grounding
jumper (pigtail) from the receptacle to the box? All boxes and conduits are metal.
Separate EGCs were NOT installed with these circuits.I. a receptacle installed on a
surface-mounted "bell" box where both washers were removed from the receptacle
mounting screwsII. a self-grounding receptacle mounted on a switch box that is set back
in the sheetrock wall not more than 1/ 4 inch where the washer was removed from the
receptacle mounting screwsIII. a receptacle on a surface-mounted handy box where
both washers were removed from the receptacle mounting screws
Select one:
a.I only
b.I, II & III
c.I & III only
d.II only
e.none of these - 2020 NEC: 250.146
The correct answer is: none of these
To apply the exception to NEC® 250.140, the existing wiring method to a 120/240-volt
range can be ___.I. 8-2 with ground Type NM cableII. 8-3 (without ground) Type NM
cableIII. 8-3 Type SE cable (all three conductors insulated)
Select one:
a.III only
b.II or III only
c.I or II only
d.I, II or III - 2020 NEC: 250.140 Exc
The correct answer is: II or III only
Section ___ of the NEC® permits the equipment grounding conductor used as an
isolated grounding conductor to pass through a metal box without being connected to
the box.
Select one:
a.250.149
b.250.148
c.250.146
d.250.66 - 2020 NEC: 250.146(D)
The correct answer is: 250.146
Four metal 4"-Square boxes with 1-gang metal plaster rings are roughed into a wall that
will be covered with sheetrock. The plaster rings are 1/2" rise and the sheetrock is 5/8".
Self-grounding 120-volt duplex receptacles are to be installed at each box. The home
