Douglas Krantz - Technical Writer - Describing How It Works
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Reader Feedback of Books and Articles

Which Way Does Electricity Flow?
Which Way Does Electricity Flow?
Which Way Does Electricity Flow?

I hope you don't mind me complimenting you on an article you wrote "Which way does electricity flow?" I was reading many articles which explained how the confusion started with Franklin but your article was the first to show Edison's thermionic emission discovery which demonstrates the true direction in the most simple and elegant way.

Thank you! - Julius Mazzarella
Make It Work - Conventional Fire Alarms
Make It Work - Conventional Fire Alarms

I'm a PLT with 6 years in the field, and recently took a job that calls for a fair amount of fire systems work. I have never touched a life safety system before this job, and have had an exciting time learning the ropes (the guy I replaced was the only person who worked on low voltage and he gone). Very excited to read this book, it appears to be exactly what I need to get the job done.

Thank you! - John Elliott

Make It Work -Conventional Fire Alarms
Make It Work - Conventional Fire Alarms

I'm a PLT with 6 years in the field, and recently took a job that calls for a fair amount of fire systems work. I have never touched a life safety system before this job, and have had an exciting time learning the ropes (the guy I replaced was the only person who worked on low voltage and he gone). Very excited to read this book, it appears to be exactly what I need to get the job done.

Thank you! - John Elliott

Make It Work - Hunting Ground Faults
Make It Work - Hunting Ground Faults

I have just begun checking out the two books I purchased from you, starting on the ground fault one. I am very pleased what I am reading so far. In just the first few pages I have determined that it is practical information from a very experienced troubleshooter of fire alarm systems, it is a gem! It will help me tremendously if I get a shot at a fire alarm technician position. I believe it is way more valuable than what I can learn from fellow field techs. In the field, techs have their own way of approaching a problem, and claim it to be the best way. I have encountered this. MOST do not make good teachers. In other words, a lot struggle how to clearly explain things. It may be clear to them but, clear as mud to the one trying to learn from it! Some are really good troubleshooters but, really poor explainers. The tips in this book are clear and to the point, and the bonus, MANY EXAMPLES, and EXPLAINED! I want to thank you for such invaluable information to help me should I get a fire alarm tech position. I do have an interview coming up this Monday for one, fingers crossed!

I am all for promoting "top shelf" technical documentation. I'm not kidding, it is the best technical information I have come across in my career. The majority of tech manuals lack clarity. Maybe it's because they are written by those with no field experience but, only technical documentation knowledge. Your ground fault book reeks field experience, and is very lucid, I consider, rare. I have no doubt your Conventional fire alarm book will be the same, and look forward to reading it.

-- Michael Lagrimas

Make It Work -Conventional Fire Alarms
Make It Work - Hunting Ground Faults

I have just begun checking out the two books I purchased from you, starting on the ground fault one. I am very pleased what I am reading so far. In just the first few pages I have determined that it is practical information from a very experienced troubleshooter of fire alarm systems, it is a gem! It will help me tremendously if I get a shot at a fire alarm technician position. I believe it is way more valuable than what I can learn from fellow field techs. In the field, techs have their own way of approaching a problem, and claim it to be the best way. I have encountered this. MOST do not make good teachers. In other words, a lot struggle how to clearly explain things. It may be clear to them but, clear as mud to the one trying to learn from it! Some are really good troubleshooters but, really poor explainers. The tips in this book are clear and to the point, and the bonus, MANY EXAMPLES, and EXPLAINED! I want to thank you for such invaluable information to help me should I get a fire alarm tech position. I do have an interview coming up this Monday for one, fingers crossed!

I am all for promoting "top shelf" technical documentation. I'm not kidding, it is the best technical information I have come across in my career. The majority of tech manuals lack clarity. Maybe it's because they are written by those with no field experience but, only technical documentation knowledge. Your ground fault book reeks field experience, and is very lucid, I consider, rare. I have no doubt your Conventional fire alarm book will be the same, and look forward to reading it.

-- Michael Lagrimas

ElecElectricalFlow.html
Which Way does Electricity Flow?

Finally, an explanation I can get my 79-year-old head around. I won't say I understand it, but I "understand". The two moving gifs in your article really helped.

Thank you! - EH

ElecElectricalFlow.html
Which Way does Electricity Flow?

Finally, an explanation I can get my 79-year-old head around. I won't say I understand it, but I "understand". The two moving gifs in your article really helped.

Thank you! - EH

 There doesn't seem to be a Code forbidding the two circuits together. If the NAC is for horns and strobes, running the NAC and the SLC for a short distance shouldn't be an issue. If the NAC is for speakers, the NAC shouldn't be run with any other circuit at all for any distance.
Is There a Code Saying the NAC Can't be in Conduit with the SLC?

I appreciate you highlighting the AC and DC currents in these various circuits, it makes it that much more logical to comprehend.

Thank you! - J

 There doesn't seem to be a Code forbidding the two circuits together. If the NAC is for horns and strobes, running the NAC and the SLC for a short distance shouldn't be an issue. If the NAC is for speakers, the NAC shouldn't be run with any other circuit at all for any distance.
Is There a Code Saying the NAC Can't be in Conduit with the SLC?

I appreciate you highlighting the AC and DC currents in these various circuits, it makes it that much more logical to comprehend.

Thank you! - J

Make It Work - Addressable Signaling Line Circuits
Make It Work - Addressable Signaling Line Circuits
Make It Work - Addressable Signaling Line Circuits

I recently purchased your book, Make It Work - Addressable Signaling Line Circuits. It's a fantastic book and has a lot more than just SLC. Every fire alarm technician should read this book. What I was hoping to find was a much better description than the manufacturers provide on SLC timing, data latency, loop capacitance and what is a proper waveform on an oscilloscope for an SLC circuit.

Thank you! - T K
Buy the Book
Buy the Book
Make It Work - Conventional Fire Alarms

I got your book and I like it so far. It explains basic stuff about fire alarms. I'm electrician and I'm starting to install fire alarm projects. I have few questions that I would like to ask you. I you have the time and disposition to help me, let me know. I'll could send another email.

Thank you! - HP
Buy the Book
Buy the Book
Make It Work - Hunting Ground Faults

Great informative book.

Thank you! - MJ
In conventional fire alarm circuits, if a wire breaks in a Class B circuit, some of the devices are disconnected from the panel, if a wire breaks in a Class A circuit, the devices that would have been disconnected use an alternative wire path to the panel.
in conventional fire alarm circuits, if a wire breaks in a Class B circuit, some of the devices are disconnected from the panel, if a wire breaks in a Class A circuit, the devices that would have been disconnected use an alternative wire path to the panel.
What's the Difference Between Conventional Class A and Class B?

Thank you Doug for the instruction on class a and b alarm systems.

Thank you! - BP
Make It Work- Hunting Ground Faults
Make It Work- Hunting Ground Faults
Make It Work- Hunting Ground Faults

Yes, thanks for the information and your book with ground faults. It helps me a lot.

Thank you! - A W
Buy the Book
 Buy the Book
Make It Work - Conventional Fire Alarms

Thank you, sir. I have lots to learn!

Thank you! - J
Why Doesn't My Smoke Alarm Set Off The Building Alarms?
Why Doesn't My Smoke Alarm Set Off The Building Alarms?
Why Doesn't My Smoke Alarm Set Off The Building Alarms?

Not a question, but your page "Why Doesn't My Smoke Alarm Set Off The Building Alarms?" answered a question I have long thought about, and of course makes total sense.

Many Thanks! - E
I want to say THANK YOU Douglask
I want to say THANK YOU Douglas
Do Heat Detectors Have an Operational Life?

I do not have a question today, but I want to say THANK YOU Douglas for your generosity spending your time sharing your valuable expertise to us.

Thank you! - S S
Should a magnet be used or canned smoke
Should a magnet be used or canned smoke
Can a Magnet Really be Used to Test a Smoke Detector?

I like your webpage and article on smoke vs magnetic testing of smoke detectors. . .

Thank you! - P H
Douglas Krantz's Technician's Corner
Douglas Krantz's Technician's Corner
Douglas Krantz's Technician's Corner

I am a fan of your "Technician's conner". That gives us much knowledge about the fire alarm system. Thanks for your great experience sharing.

BC
Douglas Krantz'a Technician's Corner
Douglas Krantz'a Technician's Corner
Douglas Krantz's Technician's Corner

I wanted to say your website has the most and best information on the internet that I can find in regards to fire alarm.

Do you sell your information in a book? I would love to buy it.

Thank you! - E E
Douglas Krantz'a Technician's Corner
Douglas Krantz'a Technician's Corner
Douglas Krantz'a Technician's Corner

I think all again is working as it should be school's phone numbers are not connected to the Churches Fire Panel for panel tests :)

Douglas Krantz was able to help me quickly and for free correct the problem of school's main line, which was sounding like a fax line. Doug noticed a phone line wire was touching another wire. Doug is smart and so experienced in alarm panels, phones, and tech stuff.

His web site is (Technician's Corner) at www.douglaskrantz.com

Thank you! - T F
Douglas Krantz'a Technician's Corner
Douglas Krantz'a Technician's Corner
Douglas Krantz'a Technician's Corner"

I am starting as a newbie drafter using AutoCAD to produce drawings for sales people in our company. I have learned more about FA wiring and the what, how and why of things by reading your articles in a very short amount of time, than reading books and watching Utube videos.

Thank you! - N A
What Voltage Should Be at the EOL of a NAC?
What Voltage Should Be at the EOL of a NAC?
What Voltage Should Be at the EOL of a NAC?

Thank you Mr Krantz, your articles are very helpful. I appreciate you keeping them concise.

Thank you! - J M
What's the Difference Between Conventional Class A and Class B?
What's the Difference Between Conventional Class A and Class B?
What's the Difference between Class A and Class B Circuits?

Hi Douglas - I just wanted to say thank you for all the detailed explanations you provide. You're newsletter is very informative!

The diagrams you created help to establish the theory for me.

Cheers, B T, Fire Prevention Officer
How do I Fix this Comm Fail Light?
How do I Fix this Comm Fail Light?
How do I Fix this Comm Fail Light?

Good info. I sent it to all of my techs.

You may want to add make sure your butt set is in the listen in only mode and not talk otherwise the dialer can't dial out. It's like having two phones on the line at same time preventing either phone from being able to make a call out.

Best regards, J S
Douglas Krantz's Technician's Corner
Douglas Krantz's Technician's Corner
Douglas Krantz's Technician's Corner

Thank you for your website. I recently started a new project and am dealing with more electronics than I am used to, coming from a purely software background of 10 years. Your articles about relays, voltage, current, and resistance were very well organized and easy to understand. Keep up the great work!

Thank you! - K T
Douglas Krantz's Technician's Corner
Douglas Krantz's Technician's Corner
Douglas Krantz's Technician's Corner

Douglas, thank you so much for these emails I read every one of them, they are very informative.

Thank you! - D D
Make It Work - Conventional Fire Alarms
Make It Work - Conventional Fire Alarms
Make It Work - Conventional Fire Alarms

I received all 4 PDF's. I see the differences, and I appreciate the time you put in to create a product that looks good on both formats. I will enjoy reading and learning. I work at LAX, and the only training I have had really has been what I have figured out by having issues appear. There is so little that I actually know. It's rather embarrassing at times to be quite honest. Thank you again for your efforts with these books, and for your receptiveness with my inquiry.

Thank you! - J C