NM ES-3 TEST EXAM 2025/2026
QUESTIONS AND ANSWERS 100% PASS
What is the minimum clearance to the edge of a wood stud for a wire hole? - ANS 1 1/4
inches(NEC 300.4 A 1)
What is the minimum separation between a class 1 fire alarm circuit conductor and a class 2 or
class 3 circuit? - ANS 1/4 inch
A basic alarm system will have __ power sources. - ANS 2
What is the minimum required clearance between a receiving antenna and 250 volt line not
insulated? - ANS 2 Feet
The minimum clearance for an antenna to other conductors is? - ANS 2 Feet (NEC 810.13)
How far away must communications cables be from electric, light, or power conductors -
ANS 2 inches
what is the maximum blink rate on a strobe light per second? - ANS 2 (NFPA 72 18.5.2.1)
1 @COPYRIGHT 2025/2026
, On a voice alarm system what is the minimum number of cycles it has to report an evacuation
procedure? - ANS 2 (NFPA 72 24.4.1.2.1)
What is the minimum required height for a propriety manual pull fire alarm? - ANS 3 1/2 feet
or 42 inches
An overhead feeder must have a clearance of __ from chimneys, radio, and television antennas.
- ANS 3 Feet (NEC 225.19 B)
The NEC classifies Continuous Load as equipment running at a maximum load of __ ____? -
ANS 3 hours
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? - ANS 3 hours or more
The minimum head room of working space above service equipment, switchboards, panel
boards, or motor control centers shall be at least: - ANS 6.5 feet
What is the minimum required separation between communication cables and lighting
conductors? - ANS 6 feet
What is the minimum separation required between coaxial cable in a CATV system and lighting
conductors - ANS 6 feet
On a radio antenna receiving station what is the minimum clearance between lead-in
conductors and conductors forming a part of a lightning protection system? - ANS 6 feet
What is the minimum length of a grounding rod in an application of less than 50 volts? -
ANS 8 Feet (NEC 250.5.2.5)
2 @COPYRIGHT 2025/2026
QUESTIONS AND ANSWERS 100% PASS
What is the minimum clearance to the edge of a wood stud for a wire hole? - ANS 1 1/4
inches(NEC 300.4 A 1)
What is the minimum separation between a class 1 fire alarm circuit conductor and a class 2 or
class 3 circuit? - ANS 1/4 inch
A basic alarm system will have __ power sources. - ANS 2
What is the minimum required clearance between a receiving antenna and 250 volt line not
insulated? - ANS 2 Feet
The minimum clearance for an antenna to other conductors is? - ANS 2 Feet (NEC 810.13)
How far away must communications cables be from electric, light, or power conductors -
ANS 2 inches
what is the maximum blink rate on a strobe light per second? - ANS 2 (NFPA 72 18.5.2.1)
1 @COPYRIGHT 2025/2026
, On a voice alarm system what is the minimum number of cycles it has to report an evacuation
procedure? - ANS 2 (NFPA 72 24.4.1.2.1)
What is the minimum required height for a propriety manual pull fire alarm? - ANS 3 1/2 feet
or 42 inches
An overhead feeder must have a clearance of __ from chimneys, radio, and television antennas.
- ANS 3 Feet (NEC 225.19 B)
The NEC classifies Continuous Load as equipment running at a maximum load of __ ____? -
ANS 3 hours
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? - ANS 3 hours or more
The minimum head room of working space above service equipment, switchboards, panel
boards, or motor control centers shall be at least: - ANS 6.5 feet
What is the minimum required separation between communication cables and lighting
conductors? - ANS 6 feet
What is the minimum separation required between coaxial cable in a CATV system and lighting
conductors - ANS 6 feet
On a radio antenna receiving station what is the minimum clearance between lead-in
conductors and conductors forming a part of a lightning protection system? - ANS 6 feet
What is the minimum length of a grounding rod in an application of less than 50 volts? -
ANS 8 Feet (NEC 250.5.2.5)
2 @COPYRIGHT 2025/2026
