Fire Alarm Voltage Drop Calculation for Notification appliance
HTML-код
- Опубликовано: 4 окт 2024
- This will help the designer understand the limitation in voltage drop calculation. For basics, fundamentals and design guidelines for fire alarm please follow below links: Voltage drop calculation principle may apply to fire alarm loop.
Part 1 - • Fire Alarm Installatio...
Part 2 - • Fire Alarm Installatio...
Part 3 - • Fire Alarm Installatio...
For queries and suggestions of new video tutorials, you can send message here in these links:
Follow my official Facebook page here: / allaboutfirepro
Follow my official Patreon page here: / allaboutfirepro
#firealarm
#firealarmsystem
#fireprotectionsystem
#fireprotection
#firedetection
#firealarmvoltagedropcalculation
Very good for learning
Great video
Thank you.
The wires have resistance.what about initiating device or indicator devices.don t have resistance.why in calculation we ignore resistance of devices
thanks for this video sir...im, now into next video hehe .... is it applicable also for the detectors sir? or only for audible , i mean this v-drops calculations
It can, the logic of calculating the voltage drop for detector will be the same principle as what is discussed in the video. You just have to know the total current first based on the quantity of your load, which in your case your detector and now the resistance of your wire from point to point until you calculated the drop until last. By comparing the voltage from last with the operating voltage of your device, you can definitely say if it is ok.
What distance should we use, the distance between devices or twice the distance between devices? I've seen some sample calculations using the twice the distance between devices? Hope to hear from you soon. Thank you.
Yes, doubling distance if we use a single core wire while in the example we use already the cable resistance(ohms/km of cable(2 core) x length).
@@AllaboutFireProtection Thank you Sir. Very helpful video by the way.
Thanks you for your video. How many devices in D2?
Hi, D is just the label for our horn strobe in the example. D2 is also one unit of horn strobe. It is the same label we used in the cad drawing as example.
Why do we calculate the voltage drop according to the distance between each device?. Can't we calculate the voltage drop from the farthest device to the fire alarm control panel?
You can do it Halil, as long as you account the total current of NAC devices & total resistance of your cable you'll get your voltage drop. However, the proper way to do it and show how much voltage are dropping for each NAC device as it travels to the last device are from the table that I shown in our presentation. Thank you again for watching.
I am entering charger voltage on a pyrotronics SXL-EX panel..I am only getting 9.7 volts.....is that correct?
You may want to re-check the measurement by removing first one terminal from the battery and measure the voltage to the charger circuit. If it still lower than 12V, then you possibly have issue with supply of voltage going to your charging circuit. Check the installation manual of that FACP and look for the charger circuit voltage.
Thanx for your video, from where you get the current of the first device =0.182 A.??
It is from the total current of our notification device based on data sheet which is in our example we used horn strobe. We added both the current from horn (0.122A) considering high output plus the current of strobe (0.060A) when 15 candela setting is used. You'll get 0.182. Thanks for watching our videos.
@@AllaboutFireProtection Hi Sir
i have a question please
from where you got the table you used for determination of current for notification device ?
Please Sir, Make an input-output matrix tutorial.
Sure, we'll do. Thank you for watching.
Can you get me a quick answer..I am measuring charger voltage with nothing hooked up and getting 9.7 volts...pyrotrinics panel...is that correct?
Sir, anung current (I) ang ginamit nyo sa voltage drop calculation? Alarm current ba o quiescent?
Alarm current since it is usually more in value.
Sir, hingi lng ako overview. Yung NFPA 72 and its referral code (NFPA 70), required ba talaga na fire rated yung wire?
Example scenario for a high rise building with assembly and hotel occupancy. Yung system ay may wiring na SLC - class A, IDC - class B, NAC - class B, and 24V power supply).
Or meron bang certain condition na kelangan ma-meet para permitted kang gumamit ng hindi fire rated na wire?
Hello, kung susundan nating yung requirement from NFPA 70 for type of cable to be used for fire alarm, required na listed for fire alarm use and may resistance sa spread of fire. Pero, bago tayo magcomply sa anumang standards na gagamitin ntin, lagi ntin i-check yung ano ba yung mandated na code sa kung anong location or bansa mo i-apply yung requirement. Like dito sa pinas, check BFP Fire code requirement or if my project specs, need ntin macomply. Otherwise, kung sinabi na installation shall be installed in accordance to NFPA 72/70, then ingat tayo sa ggamitin cable and this should be verified with the project.
Hi Sir, 7:12
Does, 7 = number of fire strobes?
yes, exactly from the quantity of your horn strobe.
@@AllaboutFireProtection. Good Day po, kindly elaborate the 7 units of nac, thanks.
Sir tanong lng if lalakihan ko ung cable ko for nac pra sa resistance need ko parin po ba ung ganitong calculation?? Hehe thanks sir in advance more power sir.. Next sir clean agent din sna.. Hehe
Hello Jamir, thank you sa comment mo. Kung iisipin natin minsan pag sobra liit ng load natin sa isang notification appliance circuit, halimbawa may 2 units lng na sounder at ang cable gauge natin is 12 or 14 AWG, alam natin na negligible na yung drop lalo na kung mallit lng yung total run ng cable. Pero, required kasi as minimum documentation if tignan ntin sa NFPA 72 sa clause 7.2.1(8) 2016 edition yung voltage drop. Kaya madalas sa shop drawing natin or separate na calculation binibigay ntin ito sa consultant for approval. Hindi dahil required sya, mas mganda na rin maging praktis ntin na magvoltage drop calculation sa signalling loop, IDC, speaker circuit, NAC at networking loop para na rin supported tayo ng documents pag nagkaroon ng problema later sa performance at confident tayo na malinis ang wirings ntin.
Yes Jamir, susunod na yung other reference ng nfpa like NFPA 2001 which is about sa standard ng clean agent din. TTapusin ko lng topic ng NFPA 72.
Thanks for your reply ,but can you answer me again in a more clear english words,because i did not understand your reply.
@@ramezzaki6365 Hi ramez. Jamir was asking in his comment if we still need to provide voltage drop calculation if let's say we used a big size of cable in our notification circuit or sounder circuit. The answer is yes, even if it is obvious that the voltage drop will be minimal because of the size of cable. It is one of the requirement in NFPA 72 in clause 7.2.1(8) 2016 edition for fire alarm documentation to provide voltage drop calculation.