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42 Cards in this Set
- Front
- Back
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basic components of a FA system |
initiating device >control panel > signal devices annunciator panel >ancillary panel |
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what are initiating devices |
send message to comtrol panel pull station smoke alarm |
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what are signal devices |
produce audible and visual alarm. vibrating bells most common strobes |
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control panel |
brains of FA system monitor initiating Devices send activate output devices |
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single stage system |
any initiating device initiates an alarm schools apartment buildings |
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two stage system
where is it used how long until repeat |
initiating device sends alert signal to signal converted to alarm by trained staff who have key or after 3 to 5 minutes
hospitals airports |
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type 1 system |
any initiating device activates all alarms |
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type 2 |
same as type one but has annunciator panel |
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type 3 |
initiating device sends coded signal to all alarms goes into full alarm after 4 repeats stage 1 |
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type 4 |
initiating device causes distinctive alarm stage 2 has annunciator panel |
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type 5 |
similar to type 4 but initiating device sends coded signal to indicate what zone alarm is in |
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fire alarm zone where only one zone is allowed |
location covered by initiating device less than 2000m2 3 storeys maximum |
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what feature would be used to differentiate stage one from stage 2 |
key |
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what authority determines fire alarm specs |
ULC not CSA |
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do you need a pull station at each stairwell |
yes |
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what is manual pull station |
NO mechanical switch sometimes with glass rod |
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key operated |
requires a key and pull. |
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thermal detector |
responds to change in heat |
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restorable detector |
bimettalic strip returns to non alarm state after heat is removed |
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non restorable thermal detector |
can't be reversed after alarm |
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fixed temp detector ratings |
57 Celsius to 88 Celsius |
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rate of rise detector |
unsuitable in kitchen contacts close of temperature rises by 8 degrees per minute short response time |
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smoke detector types |
easiest detection ionization and photoelectric |
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ionization detector |
aka products of combustion uses radioactive material normally slows 1x10-12 amps when smoke is present allows zero more sensitive than photo |
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photoelectric |
aka obstruction emits light beam smoke interupts ligt beam |
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signal devices do what |
warn peole of fire situation |
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vibrating bell |
most common oldest 10 inch bell most common 120v or 24v |
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single stroke bell |
gives both alert and vibrating alarm
two stage system |
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where are chimes used |
hospitals and quiet areas |
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horns and sirens |
used in loud areas where bells are commonly used |
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visual devices |
used in buildings open to the public where hearing impaired peole might be present. one light must be visible at all times by evèryone in building used long with audio devices |
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loud speakers |
used where instructions need to be given |
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control panel where does power come from |
brains of FA system
has back up power supply gets power from separate circuit in panel most modern ones use addressable systems |
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electrical supervision |
FA system continuously monitored for opens and grounds |
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class a wiring |
each device supplied from 2 directions mlre reliable than class 2 cause open will not disable any devices no EOL resistor |
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class b |
supplied from one direction open Wil disable all downstream devices uses EOL resistor pigtailing not permitted |
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FA system panel lights meaning |
trouble red = alarm yellow = trouble red = alarm green = normal power green = normal power |
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non addressable FA systems which class |
class b |
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all FA system initiating devices what type of contact |
NO |
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do all FA systems need electrical supervision |
yes |
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short circuit on inotiating device will give |
alarm |
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short circuit on signal device will give |
trouble |
