Introduction to Circuit Protection (Full Lecture)
In this lesson we'll take an introductory look at fuses, circuit breakers, GFCIs, and overload relays. Additionally, we'll examine system and equipment grounding and compare and contrast high and low side switched loads. (Full Lecture)
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Programmable Logic Controllers (PLCs) • Programmable Logic Con...
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Пікірлер: 16
I was recommended by Jim to come here and review this lecture before proceeding the hydraulic lectures
@roseelectronics4582
3 ай бұрын
I'm watching this again as part of DC circuit analysis playlist
Awesome interpretation
Excellent vid 👍. Select metaphors at 4:53, thank you.
Great video sir. thank you.
Awesome
I definitely have some sort of incorrect assumption somewhere any help is appreciated. I am totally fine with the idea of high side switching being safer given conventional current and all but I am still confused as to why that is because I remember that in reality it is the electron that carries the energy and is flowing out of the negative terminal. The electrons coming out of the negative terminal have a higher energy potential and disipate it through an element. So in reality the (+) end has the low energy electrons and should have a voltage of 0 in relation to the ground no?
Your high side/low side analogy brings back a mistake I made troubleshooting a rear windshield wiper motor, I thought the motor was grounded through the body of the chassis as the low side return path. I noticed when I measured from chassis ground to the motor I had 12V, so why doesn't the motor operate? Wrong answer! The circuit switches the LOW/Ground side from the dash switch! The circuit was missing the return ground conductor. After some visual inspection in the wiring harness, buried under other wiring, guess what, a broken wire! Dah! Thats where the rear hatch opened & closed, gee I guess thats why the harness fatiged! Simple answer but easily overlooked, so don't think ground is always chassis return! You can switch ground (low side) , or feeder (high) side!
@bigbadtech
3 жыл бұрын
I've had that "sinking" feeling too. A lot of 7 segment displays use a common anode (ie: positive) and then sink each cathode (ie: negative) to illuminate specific segments.
need to go over overvoltage and reverse polarity protection
@bigbadtech
Жыл бұрын
Stay in touch. I eventually plan on doing a whole playlist on protective relaying.
Please I have a question. How do you wire a GFCI in a circuit for earth leakage protection. Is it wired as low side switch?
@bigbadtech
3 жыл бұрын
Wiring a residential GFCI is really no different than a regular outlet. All the switching is done internally. This being said there is a LINE side and a LOAD side. The LINE side is incoming single phase AC. The LOAD side is for any outlet downstream that also needs to be protected. GND connection on the GFCI also.
@oddevenify
3 жыл бұрын
Fuses, CB, GFCI are all circuit interrupters with different principles of operation to achieve the same purpose, therefore all are recommended for HS switching
Since p=(i^2)*R. So if the current is less than 1 unit, can we say that "If the current increases, less power will be dissipated"?
@bigbadtech
3 жыл бұрын
No. It doesn't work that way. Try a couple examples. Example: current through a 120 ohm resistor increases from 26mA (.026A) to 27mA (.027). Power increases from 81.1mW to 87.5mW. Any increase in current always results in an increase in power given constant resistance.