NM ES-3 TEST QUESTIONS AND ANSWERS
The NEC classifies Continuous Load as equipment running at a maximum load of __
____? - Answers -3 hours NEC 100.1 (Definitions)
A continuous load is a load where the maximum current is expected to continue for a
certain length of time. This amount of time is? - Answers -3 hours or more NEC 100.1
(Definitions)
If a cable is being installed in an area that is above a suspended ceiling that contains
completely enclosed air ducts what term or word identifies this location? - Answers -
Accessible NEC 100.1 (Definitions)
What is the definition for all grounds in a building? - Answers -Earth NEC 100.1
(Definitions)
Nonconductive optical fiber cable contains no metallic members and no other ____
materials - Answers -Electrically conductive NEC 100.1 (Definitions)
A bare conductor is one with? - Answers -No Covering or insulation whatsoever NEC
100.1 (Definitions)
A compartment or chamber to which one or more ducts are connected in which forms
part of the air distribution system is a ? - Answers -Plenum NEC 100.1 (Definitions)
A device that establishes a connection between two or more conductors by means of
mechanical pressure and without the use of solder is called - Answers -Pressure
connector NEC 100.1 (Definitions)
Which of the following describes cleaning and lubricating compounds that can cause
severe damage to many plastic insulating materials: - Answers -Deteriorating agents
NEC 110.11 (Note 2)
According to the NEC electrical equipment may not be mounted to concrete, cinder
block, or brick walls with one of these___. - Answers -Wooden plugs NEC 110.13
What is the minimum width of working space requires for electrical equipment that us 48
inches wide? - Answers -48 inches NEC 110.26 (A) (2)
The minimum head room of working space above service equipment, switchboards,
panel boards, or motor control centers shall be at least: - Answers -6.5 feet NEC
110.26 (A) (3)
What must be provided for in all working spaces above all service equipment? -
Answers -illumination NEC 110.26 (D)
, An overhead feeder must have a clearance of __ from chimneys, radio, and television
antennas. - Answers -3 Feet NEC 225.19 B
Insulated conductors of number 6 or smaller intended for use as ground conductors in a
circuit must be either of the following colors - Answers -Green or Green with one or
more yellow stripes NEC 250.119
Which of the following is an acceptable marking method for the grounding conductor on
the ground type receptacle - Answers -Green colored hexagonal head or shaped
terminal screw or nut NEC 250.126
All of the following is acceptable as a ground except? - Answers -10 foot gas pipe NEC
250.52 (A)
What is the minimum length of a grounding rod in an application of less than 50 volts? -
Answers -8' NEC 250.52.5
What would be the maximum vertical spacing for a conductor support in a vertical
raceway that has an 18 gauge conductor? - Answers -100 feet NEC 30.19 (A) (TABLE)
What is the minimum clearance to the edge of a wood stud for a wire hole? - Answers -
1 1/4 inches NEC 300.4 (A) (1)
Electrical conduit buried 18 inches below grade shall have a warning tape at how many
inches above the conduit? - Answers -12 inches NEC 300.5 (D) (3)
What type of wire is used for common direct burial? - Answers -UF NEC 340.10
Where are splices allowed in conductors in surface metal raceways if they do not have
removable covers? - Answers -Boxes or Junction Boxes NEC 386.56
A phase converter is an electrical device that - Answers -Converts single phase power
to 3 phase electrical power NEC 455.2
A rotary phase converter has a nameplate rating of 28 full load input amps, disregard
the exceptions, what is the minimum ampacity required for the conductor supplying the
phase converter? - Answers -35 NEC 455.6 (A) (1)
When using a phase converter for a fixed load the single phase conductors must have
an ampacity not less than what percentage of the full load current rating of the motor or
other load being served where the input and output voltages are the same - Answers -
250% NEC 455.6 (A) (2)
The NEC classifies Continuous Load as equipment running at a maximum load of __
____? - Answers -3 hours NEC 100.1 (Definitions)
A continuous load is a load where the maximum current is expected to continue for a
certain length of time. This amount of time is? - Answers -3 hours or more NEC 100.1
(Definitions)
If a cable is being installed in an area that is above a suspended ceiling that contains
completely enclosed air ducts what term or word identifies this location? - Answers -
Accessible NEC 100.1 (Definitions)
What is the definition for all grounds in a building? - Answers -Earth NEC 100.1
(Definitions)
Nonconductive optical fiber cable contains no metallic members and no other ____
materials - Answers -Electrically conductive NEC 100.1 (Definitions)
A bare conductor is one with? - Answers -No Covering or insulation whatsoever NEC
100.1 (Definitions)
A compartment or chamber to which one or more ducts are connected in which forms
part of the air distribution system is a ? - Answers -Plenum NEC 100.1 (Definitions)
A device that establishes a connection between two or more conductors by means of
mechanical pressure and without the use of solder is called - Answers -Pressure
connector NEC 100.1 (Definitions)
Which of the following describes cleaning and lubricating compounds that can cause
severe damage to many plastic insulating materials: - Answers -Deteriorating agents
NEC 110.11 (Note 2)
According to the NEC electrical equipment may not be mounted to concrete, cinder
block, or brick walls with one of these___. - Answers -Wooden plugs NEC 110.13
What is the minimum width of working space requires for electrical equipment that us 48
inches wide? - Answers -48 inches NEC 110.26 (A) (2)
The minimum head room of working space above service equipment, switchboards,
panel boards, or motor control centers shall be at least: - Answers -6.5 feet NEC
110.26 (A) (3)
What must be provided for in all working spaces above all service equipment? -
Answers -illumination NEC 110.26 (D)
, An overhead feeder must have a clearance of __ from chimneys, radio, and television
antennas. - Answers -3 Feet NEC 225.19 B
Insulated conductors of number 6 or smaller intended for use as ground conductors in a
circuit must be either of the following colors - Answers -Green or Green with one or
more yellow stripes NEC 250.119
Which of the following is an acceptable marking method for the grounding conductor on
the ground type receptacle - Answers -Green colored hexagonal head or shaped
terminal screw or nut NEC 250.126
All of the following is acceptable as a ground except? - Answers -10 foot gas pipe NEC
250.52 (A)
What is the minimum length of a grounding rod in an application of less than 50 volts? -
Answers -8' NEC 250.52.5
What would be the maximum vertical spacing for a conductor support in a vertical
raceway that has an 18 gauge conductor? - Answers -100 feet NEC 30.19 (A) (TABLE)
What is the minimum clearance to the edge of a wood stud for a wire hole? - Answers -
1 1/4 inches NEC 300.4 (A) (1)
Electrical conduit buried 18 inches below grade shall have a warning tape at how many
inches above the conduit? - Answers -12 inches NEC 300.5 (D) (3)
What type of wire is used for common direct burial? - Answers -UF NEC 340.10
Where are splices allowed in conductors in surface metal raceways if they do not have
removable covers? - Answers -Boxes or Junction Boxes NEC 386.56
A phase converter is an electrical device that - Answers -Converts single phase power
to 3 phase electrical power NEC 455.2
A rotary phase converter has a nameplate rating of 28 full load input amps, disregard
the exceptions, what is the minimum ampacity required for the conductor supplying the
phase converter? - Answers -35 NEC 455.6 (A) (1)
When using a phase converter for a fixed load the single phase conductors must have
an ampacity not less than what percentage of the full load current rating of the motor or
other load being served where the input and output voltages are the same - Answers -
250% NEC 455.6 (A) (2)
