IEC FINAL EXAM QUESTIONS AND CORRECT
DETAILED ANSWERS (VERIFIED ANSWERS)
|ALREADY GRADED A+
Which of these is the symbol used for a 4-way switch? - ans -c.$4
Lighted handle toggle switches utilize a neon lamp that is illuminated when the
switch is in the ___ position. - ans -b.OFF
The ungrounded conductor is often called the ___. - ans -hot
Refer to Figure 113.511. The receptacle is properly connected and energized. If
the leads of the voltmeter are placed between Points A and B, the meter should
indicate ___ volts. - ans -0
Refer to Figure 113.511. The receptacle is properly connected and energized. If
the leads of the voltmeter are placed between Points B and E, the meter should
indicate ___ volts. - ans -120
Refer to Figure 113.513. ___ is a single receptacle (NO special functions). - ans -
Drawing III
The level of leakage current required to trip an IDCI- or ALCI-protected appliance
is ___. - ans -4 to 6 mA
For homes, Section ___ of the NEC® requires that all 125-volt, single-phase, 15- or
20-amp receptacles installed in unfinished basements, such as workshops, shall
have GFCI protection. - ans -210.8(A)(5)
Section 210.8(A)(5) of the NEC® states that a receptacle located in ___ in a house
shall be GFCI protected.
I. a finished basement
II. an unfinished basement
III. a workroom in an unfinished basement - ans -II & III only
,Does the NEC® have GFCI requirements for 120-volt receptacles along a wet-bar
sink countertop in a conference room in an office building? - ans -Yes
In a home, GFCI protection must be provided for all 125-volt, single-phase, 15- or
20-ampere receptacles installed ___. - ans -all these locations
In a dwelling garage, a 20-ampere, 125-volt receptacle installed for general use
and located over a work bench would not require GFCI protection. - ans -False
In a house, a single receptacle installed in a garage or unfinished basement in a
dedicated space for a cord-and-plug-connected appliance such as a freezer or
refrigerator ___ required to be protected by a ground-fault circuit-interrupter. -
ans -is
Section 210.8(A)(2) in the NEC® permits a single receptacle in the garage of a
home to be unprotected by a GFCI if a freezer is to be connected to this
receptacle. - ans -False
A receptacle is to be installed on the roof of a doctor's office building. Is this
receptacle required to be GFCI protected? - ans -YES
Section ___ in the NEC® requires that receptacles installed in the indoor public
parking garage of a doctor's office building be GFCI protected.
Note: Select N/A (not applicable) if there is not an NEC® requirement. - ans -N/A
Refer to Figure 113.414. In a commercial kitchen, receptacles (3) and (10) require
GFCI protection. - ans -True
Section 406.4(D)(2) in the NEC® permits existing two-wire, nongrounded-type
receptacles to be replaced with a ___ where no equipment grounding conductor
exists. - ans -any of these
According to EWR Dwg 9, how many GFCI-protected receptacles are required to
be installed outdoors? - ans -6
According to the EWR prints, what is the total number of receptacles required in
the EWR bathrooms? - ans -3
,In the EWR garage (refer to Dwg 9), ___ GFCI receptacle(s) and ___ GFCI-
protected receptacle(s) are required. - ans -1 4
A total of ___ receptacles are to be GFCI protected on EWR Drawings 8 & 9 only. -
ans -28
When using any power tools, you should wear safety goggles. - ans -True
The cord on a power tool you are planning to use has a split in the cord jacket but
the insulated conductor inside appears to be undamaged. You should ___. - ans -
tag it as unsafe and send the tool to the shop for repair
Before plugging in a power tool, you should ___. - ans -all of these
You should be aware of the direction of rotation of a power tool because unless
you brace yourself a sudden jam could knock you off balance. For example, you
are drilling a hole with a hole saw in a drill. When looking down on a drill, if the
saw jams the drill will twist in a ___ direction. - ans -counter-clockwise
The guards on power tools can be removed ___. - ans -neither a nor b
Although there are a few exceptions for AC systems that supply premises wiring,
the NEC® generally requires that systems operating at ___ volts to 1,000 volts be
grounded. - ans -50
Before starting to work with a power tool, you realize that someone is in the path
of flying particles that will be produced when you start. You ___ responsible for
advising that person. - ans -are
Power tool cords should be kept away from ___. - ans -any of these
You need to use a power saw but you notice that the guard is damaged. You
should ___.
I. use it to make your cuts but be EXTREMELY careful
II. take the tool to your supervisor or tell him about it immediately
III. go find another one to use but don't use this tool - ans -II only
, The National Electrical Code® does not address the issue of "spill lighting" or "light
pollution" from one property to another because unwanted illumination is not a
safety issue, and the NEC® is a safety standard. However, building codes
sometimes have rules on this subject. - ans -True
Overheating of luminaires (fixtures) which often results in fires is most often
caused by ___. - ans -both a and b
Luminaire is a term that refers to ___. - ans -either a, or b, or c
The amount of light required at a dentist's chair is ___ that required to operate a
gas pump at a Stop-N-Go convenience store. - ans -more than
Fluorescent ballasts contain thermal protectors that will open the circuit
(disconnect power) to prevent ___.
I. short circuits II. ground faults III. overheating - ans -III only
Where a recessed luminaire contains a thermal device (cutout switch) to protect
against overheating, this device will ___.
I. automatically disconnect power from the luminaire when the temperature gets
too high
II. have to be manually reset (after opening) when the temperature gets low
enough - ans -I only
When a ballast's case temperature reads 110°C, the thermal protection for a class
P ballast must open within ___. - ans -2 hours
When lamps with wattages greater than the rating of the luminaire are installed,
a fire could occur because the luminaire is being overheated. - ans -True
A Class P ballast has ___ thermal protection to prevent ballast overheating that
could cause fires. - ans -built-in
Where installed in a luminaire, which of these fluorescent lamps should be
replaced? - ans -all of these
DETAILED ANSWERS (VERIFIED ANSWERS)
|ALREADY GRADED A+
Which of these is the symbol used for a 4-way switch? - ans -c.$4
Lighted handle toggle switches utilize a neon lamp that is illuminated when the
switch is in the ___ position. - ans -b.OFF
The ungrounded conductor is often called the ___. - ans -hot
Refer to Figure 113.511. The receptacle is properly connected and energized. If
the leads of the voltmeter are placed between Points A and B, the meter should
indicate ___ volts. - ans -0
Refer to Figure 113.511. The receptacle is properly connected and energized. If
the leads of the voltmeter are placed between Points B and E, the meter should
indicate ___ volts. - ans -120
Refer to Figure 113.513. ___ is a single receptacle (NO special functions). - ans -
Drawing III
The level of leakage current required to trip an IDCI- or ALCI-protected appliance
is ___. - ans -4 to 6 mA
For homes, Section ___ of the NEC® requires that all 125-volt, single-phase, 15- or
20-amp receptacles installed in unfinished basements, such as workshops, shall
have GFCI protection. - ans -210.8(A)(5)
Section 210.8(A)(5) of the NEC® states that a receptacle located in ___ in a house
shall be GFCI protected.
I. a finished basement
II. an unfinished basement
III. a workroom in an unfinished basement - ans -II & III only
,Does the NEC® have GFCI requirements for 120-volt receptacles along a wet-bar
sink countertop in a conference room in an office building? - ans -Yes
In a home, GFCI protection must be provided for all 125-volt, single-phase, 15- or
20-ampere receptacles installed ___. - ans -all these locations
In a dwelling garage, a 20-ampere, 125-volt receptacle installed for general use
and located over a work bench would not require GFCI protection. - ans -False
In a house, a single receptacle installed in a garage or unfinished basement in a
dedicated space for a cord-and-plug-connected appliance such as a freezer or
refrigerator ___ required to be protected by a ground-fault circuit-interrupter. -
ans -is
Section 210.8(A)(2) in the NEC® permits a single receptacle in the garage of a
home to be unprotected by a GFCI if a freezer is to be connected to this
receptacle. - ans -False
A receptacle is to be installed on the roof of a doctor's office building. Is this
receptacle required to be GFCI protected? - ans -YES
Section ___ in the NEC® requires that receptacles installed in the indoor public
parking garage of a doctor's office building be GFCI protected.
Note: Select N/A (not applicable) if there is not an NEC® requirement. - ans -N/A
Refer to Figure 113.414. In a commercial kitchen, receptacles (3) and (10) require
GFCI protection. - ans -True
Section 406.4(D)(2) in the NEC® permits existing two-wire, nongrounded-type
receptacles to be replaced with a ___ where no equipment grounding conductor
exists. - ans -any of these
According to EWR Dwg 9, how many GFCI-protected receptacles are required to
be installed outdoors? - ans -6
According to the EWR prints, what is the total number of receptacles required in
the EWR bathrooms? - ans -3
,In the EWR garage (refer to Dwg 9), ___ GFCI receptacle(s) and ___ GFCI-
protected receptacle(s) are required. - ans -1 4
A total of ___ receptacles are to be GFCI protected on EWR Drawings 8 & 9 only. -
ans -28
When using any power tools, you should wear safety goggles. - ans -True
The cord on a power tool you are planning to use has a split in the cord jacket but
the insulated conductor inside appears to be undamaged. You should ___. - ans -
tag it as unsafe and send the tool to the shop for repair
Before plugging in a power tool, you should ___. - ans -all of these
You should be aware of the direction of rotation of a power tool because unless
you brace yourself a sudden jam could knock you off balance. For example, you
are drilling a hole with a hole saw in a drill. When looking down on a drill, if the
saw jams the drill will twist in a ___ direction. - ans -counter-clockwise
The guards on power tools can be removed ___. - ans -neither a nor b
Although there are a few exceptions for AC systems that supply premises wiring,
the NEC® generally requires that systems operating at ___ volts to 1,000 volts be
grounded. - ans -50
Before starting to work with a power tool, you realize that someone is in the path
of flying particles that will be produced when you start. You ___ responsible for
advising that person. - ans -are
Power tool cords should be kept away from ___. - ans -any of these
You need to use a power saw but you notice that the guard is damaged. You
should ___.
I. use it to make your cuts but be EXTREMELY careful
II. take the tool to your supervisor or tell him about it immediately
III. go find another one to use but don't use this tool - ans -II only
, The National Electrical Code® does not address the issue of "spill lighting" or "light
pollution" from one property to another because unwanted illumination is not a
safety issue, and the NEC® is a safety standard. However, building codes
sometimes have rules on this subject. - ans -True
Overheating of luminaires (fixtures) which often results in fires is most often
caused by ___. - ans -both a and b
Luminaire is a term that refers to ___. - ans -either a, or b, or c
The amount of light required at a dentist's chair is ___ that required to operate a
gas pump at a Stop-N-Go convenience store. - ans -more than
Fluorescent ballasts contain thermal protectors that will open the circuit
(disconnect power) to prevent ___.
I. short circuits II. ground faults III. overheating - ans -III only
Where a recessed luminaire contains a thermal device (cutout switch) to protect
against overheating, this device will ___.
I. automatically disconnect power from the luminaire when the temperature gets
too high
II. have to be manually reset (after opening) when the temperature gets low
enough - ans -I only
When a ballast's case temperature reads 110°C, the thermal protection for a class
P ballast must open within ___. - ans -2 hours
When lamps with wattages greater than the rating of the luminaire are installed,
a fire could occur because the luminaire is being overheated. - ans -True
A Class P ballast has ___ thermal protection to prevent ballast overheating that
could cause fires. - ans -built-in
Where installed in a luminaire, which of these fluorescent lamps should be
replaced? - ans -all of these
