When the main power is disconnected, how long should a power supply with emergency voice communication systems work in alarm mode?
What must be done if the frequency of sensitivity testing is extended to 5 years?
The inspection phase, as opposed to the testing phase, of system control equipment should concentrate on which of the following tasks?
What is the periodic testing frequency of a control valve switch?
When is the elevator recall permitted to send a supervisory signal in lieu of an alarm signal?
Which of the following options is required while conducting annual testing of an audiovisual device?
When testing a room temperature switch, below what temperature does the off-normal signal occur?
When is a shunt trip operated to power down an elevator?
How often should radio transmitters be inspected?
Load testing of the control unit's VRLA batteries reveals that they must be replaced. Which two of the following are requirements for the replacement of VRLA batteries? (Choose two.)