INDUSTRIAL FIRE ALARM

[daiplayer]

HI AGAIN ALL

INSTALLING INDUSTRIAL FIRE ALARM FOR FIRST TIME. FOLLOWING INSTRUCTIONS BY MATE.

CAN SOMEONE EXPLAIN HOW THEY WORK ?

I THOUGH THEY HAD AN EOL RESISTOR TO GIVE A FIXED RESISTANCE VALUE THAT THE PANEL WOULD MONITOR. BUT WHEN INSTALLING HEAT DETECTORS EACH HEAD SEEMS TO HAVE A RESISTER IN IT.

IS THIS CORRECT ? WHY IS IT THERE ?

TIA

 

[westward10]

Are you sure you are up to installing a fire alarm.

 

[daiplayer]

Useful as ever

 

[daiplayer]

Are you sure you are up to installing a fire alarm.

No Im learning . Same as everybody has to .......

 

[LeeH]

...too.

 

[telectrix]

the device in each head is probably a diode. you may be learning, but with something like a fire alarm, you must be working under a mentor. a mistake can cause multiple fatalities.

one word.... GRENFELL.

 

[daiplayer]

Are you sure you are up to installing a fire alarm.

Oh yeah

...too.

;-) thanks

 

[daiplayer]

the device in each head is probably a diode. you may be learning, but with something like a fire alarm, you must be working under a mentor. a mistake can cause multiple fatalities.

Yes it will be checked and signed off by qualified prior to completion. Thanks for the input

 

[westward10]

Can your mate not give you this info or is he/she not actually there.

 

[daiplayer]

Can your mate not give you this info or is he/she not actually there.

He just wasn't there today . he maybe tomorrow or the next so will ask.

Whats the harm in asking here then mate ?

 

[telectrix]

well, you are right in the eol device.usually a resistor, but more recently a capacitor or a combination R & C. panel minitors eol. if the loop goes open circuit, then it goes into fault. a resistance across the loop. typically 470 Ω, sends it into Fire. addreessable systems are more complex.

 

[LankyWill]

NO NEED TO SHOUT!!!

 

[daiplayer]

NO NEED TO SHOUT!!!

YeAh nOt gOOD wiTH thE cAPs lock SORRY :-D

 

[daiplayer]

well, you are right in the eol device.usually a resistor, but more recently a capacitor or a combination R & C. panel minitors eol. if the loop goes open circuit, then it goes into fault. a resistance across the loop. typically 470 Ω, sends it into Fire. addreessable systems are more complex.

Ah ok. So the heat alarm wont actually go open circuit when it detects fire/heat , it will alter resistance ?

 

[Leesparkykent]

How big is the system? Anything over a few offices or small block of flats then addressable is the way forward...no EOL monitors/resistors to worry about either.

 

[westward10]

He just wasn't there today . he maybe tomorrow or the next so will ask.

Whats the harm in asking here then mate ?

Nothing at all but I find it worrying you are installing a safety system and asking quite rudimentary questions.

 

[daiplayer]

How big is the system? Anything over a few offices or small block of flats then addressable is the way forward...no EOL monitors/resistors to worry about either.

Its relatively small. 3 zones, 3 heads on two zones , 10 on the 3 rd plus call points.

 

[daiplayer]

Nothing at all but I find it worrying you are installing a safety system and asking quite rudimentary questions.

So how did you learn ?

 

[Leesparkykent]

Its relatively small. 3 zones, 3 heads on two zones , 10 on the 3 rd plus call points.

Do you know the make of the panel etc?

 

[westward10]

Has this been designed in accordance with BS5839 Part 1.