N=CET Level 1 Fire Alarm Systems Exam Questions And Revised Correct Answers New Update When a device is inaccessible due to excessive height, such as an atrium, what it the maximum interval for testing? 18 months When installing a wall-mounted fire telephone appliance to the public, what is the acceptable maximum mounting height from the floor? 66 inches Elevator lobby smoke detectors shall be mounted within a maximum of which distance from the center-line of the door? 21 feet At a minimum, when working near power lines with voltage of 600 volts and lower, an aerial lift operator shall maintain which distance from the lines? 10 feet The use of unprotected EMT shall be permitted under which conditions? when in direct contact with the earthAccording to NFPA 70, what is the maximum unsupported length of 1/2-inch flexible metallic conduit where flexibility is required after installation? 4 1/2 feet What is the maximum bend (in degrees) permitted in a conduit run between outlet boxes? 360 Degrees =f the primary power is disconnected and the fire alarm system goes into an alarm condition, what is the minimum acceptable time for secondary power to operate the voice evacuation systems? 15 minutes A riser