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ac circuits with less than 50 volts shall be grounded under the following conditions -
ANSWER-1- system exceeding 150 volts
2-if the transformer is ungrounded
3- where installed as overhead conductors outside of the building
AC stands for: - ANSWER-Alternating Current
Acceptable audible notification appliances used in a security system is: - ANSWER-
Self-Contained Sirens
According to NFPA 72, batteries may be used to maintain an access control system
during a power failure provided that the doors unlock with how many minutes of loss of
primary power to the alarm system? - ANSWER-10 Minutes
An electronic access control system is designed to... - ANSWER-Allow authorized
individuals in while keeping unauthorized individuals out.
An Ionization detector detects fire in what stage ? - ANSWER-Incipient (Initial Stage of
FLAME)
article 450 - ANSWER-transformers shall be protected from over current
define bonding (bonded) - ANSWER-the permitted joining of metallic parts to form an
electrically conductive path the ensures the electrical continuity and the capacity that
conduct safely any current likely to be imposed
define ground - ANSWER-a conductive connection wheather intentional or accidental
between an electrical circuit or equipment and the earth or to some conducting body
that serves in place of the earth
define live parts - ANSWER-energizing conductive components
define low voltages - ANSWER-30 volts rms 42 volts peak or 60 volts dc
In a CCTV system, where are the exit cameras generally located? - ANSWER-near the
doors pointed towards the interior of the building
May alarm wiring run in the same conduit as AC lines. - ANSWER-NOPE
May alarm wiring run in the same conduit as AC lines. - ANSWER-NOPE