Introduction to Fire Alarm Systems 3

[@Itpours]

I'm going through your videos and had to stop and let you know that there's a person out here in the world that is genuinely benefitting from your teaching. I appreciate you doing this. Thank you.

[@JoeKlochan]

Thanks, that's nice of you to say. Surprisingly I'd say overall the comments are probably 25/1 positive to negative.

[@Itpours]

@@JoeKlochan ...There's always one...lol. If you were giving out free ice cream and 20 dollar bills, for whatever reason there would be someone who is opposed to it. Keep doing what you're doing. You're helping people.

[@EdgarParedes.127]

Really appreciate the videos you created, I just transferred to the fire alarm division at my company, and your videos have made a huge difference

[@etherglow]

You are doing God's work! We just debugged a circuit in our apartment building in Indonesia with this video. I was wondering why the standby voltage to our bell was -7V (reverse polarity) instead of 24V, and then I remembered this lesson. Yes, the polarity switched and we got 24V when the bell was activated

[@normanbarton4020]

HI JOE ., JUST TO SAY MANY THANKS TO YOU FOR TAKING THE TIME TO MAKE THESES VIDEOS ,,I AM A 67 YEAR OLD WORKING ELECTRICIAN THAT NOW DOES FIIRE ALARMS,,,THANKS TO YOU....i NOW UNDERSTAND HOW THEY WORK,,,,(BASICS UP TO NOW) AND I FEEL A LOT SAFER DOING THEM. THANK YOU,,,REGARDS STORMIN.

[@Camdog2005]

Very well explained. I'm training myself in preparation to become a fire engineer and these videos are the clearest explanations on this I have found so far.

[@QFTanGreg]

Thanks for the video, very informative. Do take note that, electron flows from negative to positive, but current flows from positive to negative.

[@yaba6757]

This video was made 9 years ago, and here I am learning about it, what a blessing.

[@franciscoc5894]

I saw his videos last year when I did my first fire system installation and no matter what brand i used always help me what he teach and how he did is very clear and cool. Because we don't do more than 2 fire system per year I have to go over this again to refresh my memory because now we will going to service fire systems.

[@chaitalirane]

Hi I started watching your videos as I wanted to learn FAS and I must say videos are too good easy and simple to understand & very informative too. ThaNks !!!!!

[@rehanzahid9600]

Thank you so much sir , i never find anybody so far who can guide like you, awesome explanation keep it up Thank you

[@MyScenarios]

Thank you for making these. I’m new to fire and learning a lot

[@peterzha147]

Hi Joe. Firstly, I want to say that your videos so far are helpful for some work I'm currently doing, and I appreciate your effort. I would like to address the comment you made about current at around 2:30. "Current" in the way we use the word still does flow from positive to negative because as it is defined, current is the flow of positive charge and not electrons; having taken several electrical engineering courses recently, I can confirm that current is still taught this way. However, as you've mentioned, the flow of electrons is more relevant for some discussions. Therefore the way we think of the typical positive-to-negative-current should be more accurately described as "conventional current", which is how people often say it to differentiate from the direction of flow of electrons. I will stick to your convention for your video series but just thought I would make my own comment.

[@davidfeiring228]

Thank you, Joe. I plan to use your videos to train our new Fire Inspectors.

[@wildtrain]

Learning a lot from your videos Joe- thanks a lot!! Keep 'em coming!!

[@adonisfleitas2172]

Your videos are very articulate, I enjoy you describe the many actions when system goes into alarm this has clarified some of my questions I have had for some time. thank you please do not stop. Your a gifted teacher. !!!

[@frankdumancas5437]

Well done with the basics

[@jamescasallo2398]

Hi Joe. Your videos are awesome. Pls allow me to explain. In the battery, electrons flow from negative to positive. In the circuit, current flows from positive to negative. Therefore, the pointy part of the diode faces to the negative showing current flow. That's why you see a vertical bar on the pointed part of the diode to show that it will block any backflow. Usually diodes are used for AC to block the "negative" return of the current.

[@LuisAlbanes]

Great videos Joe, thanks!

[@mihawkhawkeye4807]

I dont know how fire alarms works, but now, thank you so much. :)

[@blinkojei]

very great video. you make it easy to understand. thank you.

[@paulvinmathew3084]

Joe you are doing an amazing job . But if I would like to say few things on current direction. Actually flow of electrons is from negative to positive and current flow is opposite to the flow of electrons . That is we consider current flow always from positive to negative( direction of holes) . Anyway keep Up the amazing work

[@dvig3261]

The current flow is the direction electrons flow...like water...the current flow of a stream is the direction the water flows......not that hard. but like Joe pointed out, the day they decided these things, they mis-diagnosed the electron direction of flow and all things after were based on that error (actually a common occurrence in science).

[@DavidPerez-mr3cs]

Thank you Joe!

[@KED_ARTSTUDIO50]

thank you for sharing these videos .you are great

[@chadrowland5234]

You should do a video about fire alarm notification signals that should be used in restrooms. I have been seeing a LOT of horn/strobes in the bathroom in buildings and you know that would be REALLY LOUD should it ever go off. So, what notification signals should I use in restrooms?

[@hanselroa]

great video dude please more videos i really want to learn fire alarm

[@Kenneth_H_Olsen]

Hey, concerning the discussion of the direction of the Ampere. Benjamin Franklin was the person who proposed that electric charges had + and - polarities. He supposed the current moved from High + to Low- reasonably. Its recent discoverys that the electron in itself is negative. and resides in vast amounts in the ground earth. kIts more reasonable that Electrons travel from ground, to an Ionized place, or a positive where ther is lack of electrons. this is called Direction of ELECTRONS. and the former is called Direction of CURRENT. these two move in opposite direction on electrical diagrams ! the symbols on electrical devices are , most usually designed in "Direction of Current", as you pointed out on the Diode .

[@rehammostafa4700]

Nice videos Joe, i have to tell that it's a physical fact that electrons flow from negative to positive, while current - on the opposite - flows from positive to negative. Still thanks for your efforts and great presentation.

[@JulesBartow]

+Reham Mostafa The flow of electrons is called current, measured in Coulombs/second. Electrons are negatively charged, which wasn't known when amp meters were first built. The electron source is the negative terminal (cathode) and the sink is the anode. That flow of negative charge appears as positive from the anode to DMMs/VOMs/amp meters by definition. Joe Klochan is correct. +Reham Mostafa you've got just enough knowledge to be demonstrably dangerous, but are missing some of the kit and kaboodle necessary to be useful. Please remove your hands from the keyboard, place them on your head and back away from the internet so nobody gets hurt.

[@sparkish8959]

So, the default state is inverted, and when the alarm activates, it reverts to match the positive and negative marking. Thanks a lot for your videos.

[@majednajmeh5894]

thank u man keep up the god job

[@samyyoussef8380]

I understand that when the fire detected the 120 amp in this case will change polarity in the NAC circuit, but how? in 6:31 you just said "the polarity will be reversed on this" again how?

[@Denverslopes]

When the panel is in an alarm state and the 24 volts is flowing through the diode, does the voltage still pass through the resistor or does it exclusively flow through the diode?

[@JoeKlochan]

Some current will pass through the resistor but it's extremely miniscule. The majority of the current is drawn by the horns and strobes.

[@mjoshi5216]

great video

[@priyanthakumara8836]

Sir please tell me what is the reason for knowing the resistance.

[@liuyusi5593]

After the alarm lights on, what does the NAC do to change the voltage from -24V into +24V?

[@springerranch]

Nevermind. Video #4 explained NAC. Great videos, thanks.

[@sujith.sudhakar]

Do addressable fire alarm technical details

[@trollMan246]

@ 3.58 its a non-return valve.

[@rehanzahid9600]

Why current flows towards negative to positive , please give technical reason

[@samyyoussef8380]

still doesn't know how the polarity in the horn terminal will be reversed when fire detected at 6:32 min. if someone explains he will be so kind.

[@JoeKlochan]

Samy, the polarity doesn't reverse at the device itself, it's a feature of the control panel. I could show you how you can create a reverse polarity circuit with just a single relay that has two sets of form C contacts, but I really have no immediate plans to make more videos. But I wanted to comment to clarify that the horn isn't reversing the polarity, the panel is. The horn is simply blocking the current from entering the device when it's flowing one direction (the supervisory current) and allowing the current to enter the device once it reverses on alarm.

[@springerranch]

What's NAC?

[@blinkojei]

notification appliance circuit

[@tomlu9672]

scott springer these devices hooked up from the FACP that triggers an action such as horn goes off, doors close, window shutter close, etc. Notification Appliance Circuit

[@tomlu9672]

Ok first off. The electron flow is all wrong. Especially how the diode is placed in the horn strobe. Electrons pass from positive to negative in a circuit. So from a diode standpoint, electricity is flowing through the positive side to negative. Maybe under normal state, the diode is set up where it's being blocked from negative to positive until the polarity reverses from the FACP. Then he horn strobe will sound. The picture of the diode is drawn the wrong direction. That's why I pointed that out.

[@yegelectric3248]

This is a great video but you are correct

[@abdelssami]

the electrones charge are negative so how could they go from pos to neg it is the charge or current that goes from pos to neg another thing didn't you notice that the symbole of a diode is an arrow blocked by a line !! it doesn't gives you any clow?? another thing if you have a magnites negative pole to neg pole would goes away when neg to pos pole would get attrackted and finally just google it

[@Rockwell1977]

Yes. Electrons are negative charges, and they flow towards the positive. Conventional current flow, or the holes left by a positive-going electron, flow from the positive to the negative. It's really just two ways of looking at the same thing. Although, you must stick to one convention when applying it to how electronic devices function.

[@bakersfieldadventuemotorcy9979]

diode points to positive side

[@samyyoussef8380]

Now what is the wring diag looks like between the two circuits ZONE 1 and NAC 1

[@reygalindo]

Was your presentation supposed to be about electronic components structure other than fire detectors? Stay focus most people don't require an electronics lecture to learn alarm systems configuration

[@plandl1]

That was painful to watch. I learned electronics from the Navy in '83 and you were confusing even me with all this diode stuff. If the device has a diode in it and needs to be wired a certain way then just say that. And voltage, current and resistance is best described using the analogy of a flowing river. Voltage is the SIZE of the river, current is the SPEED of the river and resistance is like boulders impeding the flow of that river. At least it works for me.