Thank you.

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.

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.

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.

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.

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 ?

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?

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.

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.

Alarm current since it is usually more in value.

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.

yes, exactly from the quantity of your horn strobe.

@@AllaboutFireProtection. Good Day po, kindly elaborate the 7 units of nac, thanks.