Electricity, including DIY install can kill! Please read before attempting.

[Converted to Saltwater]

I was reading a thread last night about something that really had me concerned about people adding GFCIs among other newer and better in line breakers.

Here is a picture of why this should not be attempted unless you have a firm understanding of how electricity works. This circuit is fed with alternating current. Part of it is then converted to 24 volts dc (direct current). This circuit is dead according to the breaker panel. But, there was a bad breaker. But actually is continually running. Aquatic life is fun and interesting and a constant learning experience, for me at least.
When installing anything in your home, if not equipped with the tools, (insulated drivers, meters, insulated gloves if needed) and knowledge of what your dealing with...there is no trial and error. That breaker may flip, but if you are the one to flip it you might not be around to reset it.
I ask many questions on here because I don't know. This I do know.
Here is wnere a lot of people make serious mistakes when trying to wire AC breakers. First, do you have and are fully aware of how a multimeter works? If no multimeter you cannot test for amperage or voltage potential on the line you are about to touch.
Second. Do the math, then do it again. Be sure your install does not exceed the rated amp draw. Or your wire. My house is wired with 12AWG, so this means I can pull roughly 15 watts (amperage multiplied by voltage) before tripping a breaker. Know your math.
Third. Electricity will trick you. Like that furnace circuit above even if the power was shut off there is still a capacitor that holds enough current to kill. This is especially important for people with pace makers and like me, who are epileptic. If I get zapped I go down. Everyday I troubleshoot wiring and everyday I take it as seriously as the very first time I worked with it.
Do not let me discourage you from taking on this task just know the risks, its dangerous even if you are certified.

This is a great reference book. Everything you need to know is in here. I'm certified in heating and air (lots of electrical work), ASE Electronic Diagnostics cert, and almost finished with my masters in electrical engineering. This means nothing if I don't respect the dangers. Must be careful everyone. And learn it you can do it!

 

[Ranjib]

Very informative. Thank you for sharing

 

[Converted to Saltwater]

No problem. Just noticed the response. I don't intend on creating a thread all about electrical installation scenarios. And yes GFCIs are a must in my opinion.
I just saw a few threads where the install was not explained correctly. Well installing one without fully understanding the risks and life threatening hazards is more dangerous than not having one.
In one particular thread we were told to turn off the breaker.
Ok, sure. But how so we known the breaker isn't stuck, or there isn't a short?
Checking for voltage at the terminal line was not ever discussed. This is a must!
My cousin had a pacemaker and he trusted a faulty breaker. He died at 37.
And NEVER attempt any electrical work without a multimeter, please.