NM ES-3 EXAM 2026 PRACTICE TEST PAPER
WITH FULL ANSWERS
◉ What is the smallest ground wire to to communications box
Answer: 14 AWG (NEC 830.100 A 3)
◉ What is the minimum size grounding conductor for
communications circuits Answer: 14 AWG
◉ What is the maximum interval the fire alarm signal is allowed at
the consul? Answer: 15 Seconds (NFPA 72 23.8.1.3.1.1)
◉ What is the minimum wire size for connecting bells, sirens, or
control circuitry? Answer: 18 AWG (NEC 760.49 A)
◉ According to NEC class 3 circuits are allowed a minimum wire size
of what gauge? Answer: 18 AWG (NEC 725.179 H)
◉ What is the maximum number of supervisory switches permitted
to be connected to a actuate a single transmitter? Answer: 20
, ◉ Type PLTC nonmetallic sheathed shall be a minimum size ___
gauge for class 3 circuits and have an insulation rating of atleast 300
V Answer: 22 (NEC 725.179 E)
◉ 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?
Answer: "35 (NEC 455.6 A1)
◉ What percentage of fill is allowed in a conduit with three
conductors? Answer: 40%
◉ What is the minimum width of working space requires for
electrical equipment that us 48 inches wide? Answer: 48 inches
◉ Optical fiber cables are not required to be listed and marked
where the length of the cable within the building measured from its
point of entrance does not exceed ___ and the cable enters the
building from the outside and is terminated in an enclosure. Answer:
50 feet
◉ Heat detectors used within a family unit must be listed as or
approved for not less than ___ spacing? Answer: 50 Feet (NFPA 72
29.7.3.1)
WITH FULL ANSWERS
◉ What is the smallest ground wire to to communications box
Answer: 14 AWG (NEC 830.100 A 3)
◉ What is the minimum size grounding conductor for
communications circuits Answer: 14 AWG
◉ What is the maximum interval the fire alarm signal is allowed at
the consul? Answer: 15 Seconds (NFPA 72 23.8.1.3.1.1)
◉ What is the minimum wire size for connecting bells, sirens, or
control circuitry? Answer: 18 AWG (NEC 760.49 A)
◉ According to NEC class 3 circuits are allowed a minimum wire size
of what gauge? Answer: 18 AWG (NEC 725.179 H)
◉ What is the maximum number of supervisory switches permitted
to be connected to a actuate a single transmitter? Answer: 20
, ◉ Type PLTC nonmetallic sheathed shall be a minimum size ___
gauge for class 3 circuits and have an insulation rating of atleast 300
V Answer: 22 (NEC 725.179 E)
◉ 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?
Answer: "35 (NEC 455.6 A1)
◉ What percentage of fill is allowed in a conduit with three
conductors? Answer: 40%
◉ What is the minimum width of working space requires for
electrical equipment that us 48 inches wide? Answer: 48 inches
◉ Optical fiber cables are not required to be listed and marked
where the length of the cable within the building measured from its
point of entrance does not exceed ___ and the cable enters the
building from the outside and is terminated in an enclosure. Answer:
50 feet
◉ Heat detectors used within a family unit must be listed as or
approved for not less than ___ spacing? Answer: 50 Feet (NFPA 72
29.7.3.1)
