NM ES-3 COMPREHENSIVE EXAM 2026
QUESTIONS AND ANSWERS PREMIUM
STUDY RESOURCE GRADED A+
●● 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?
Answer: 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?
Answer: Accessible NEC 100.1 (Definitions)
●● What is the definition for all grounds in a building?
Answer: Earth NEC 100.1 (Definitions)
●● Nonconductive optical fiber cable contains no metallic members and
no other ____ materials
Answer: Electrically conductive NEC 100.1 (Definitions)
●● A bare conductor is one with?
Answer: 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 ?
Answer: 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
Answer: 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:
Answer: 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___.
Answer: Wooden plugs NEC 110.13
●● What is the minimum width of working space requires for electrical
equipment that us 48 inches wide?
Answer: 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:
, Answer: 6.5 feet NEC 110.26 (A) (3)
●● What must be provided for in all working spaces above all service
equipment?
Answer: illumination NEC 110.26 (D)
●● An overhead feeder must have a clearance of __ from chimneys,
radio, and television antennas.
Answer: 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
Answer: 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
Answer: Green colored hexagonal head or shaped terminal screw or nut
NEC 250.126
●● All of the following is acceptable as a ground except?
Answer: 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?
QUESTIONS AND ANSWERS PREMIUM
STUDY RESOURCE GRADED A+
●● 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?
Answer: 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?
Answer: Accessible NEC 100.1 (Definitions)
●● What is the definition for all grounds in a building?
Answer: Earth NEC 100.1 (Definitions)
●● Nonconductive optical fiber cable contains no metallic members and
no other ____ materials
Answer: Electrically conductive NEC 100.1 (Definitions)
●● A bare conductor is one with?
Answer: 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 ?
Answer: 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
Answer: 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:
Answer: 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___.
Answer: Wooden plugs NEC 110.13
●● What is the minimum width of working space requires for electrical
equipment that us 48 inches wide?
Answer: 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:
, Answer: 6.5 feet NEC 110.26 (A) (3)
●● What must be provided for in all working spaces above all service
equipment?
Answer: illumination NEC 110.26 (D)
●● An overhead feeder must have a clearance of __ from chimneys,
radio, and television antennas.
Answer: 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
Answer: 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
Answer: Green colored hexagonal head or shaped terminal screw or nut
NEC 250.126
●● All of the following is acceptable as a ground except?
Answer: 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?
