Also for invisible dog fences.

Glad I did not have to look far for this comment ...

I am just a DIYer and I wrap the terminals on pretty much every switch or receptacle I install. First main reason is 95% of the boxes in my house are metal. Second is on my first ever project I had a ground bend just right and touch a hot screw down on a switch. I flipped the breaker back on and it immediately kicked back. I also try to be a lot more careful with where things end up in the box now too but with Smart switches, there isn't a lot of room in these old boxes.

For metal and multiple gang boxes it's a must to tape the terminals to avoid shorts and arcing. That's just like my opinion I don't think there is really a code requirement for it but doesn't hurt really so why not.

Well-defended argument and glad that you've familiarized yourself with the manufacturer's specs.

Wow, a 9 year old license electrician!! That's a first!! My point here is that electricity can easily kill you, so it isn't a good idea to take electrical advice from a 9 year old kid!! But it is good that you are learning about electricity. I assume when you say paper electrical system, you are talking about using conductive copper tape. This is OK for low voltage battery operated circuits. But before you start messing with anything lke120 volt household circuits you have a great deal to learn first. Only do this with direct guidance from a professional, not just an adult, because many of them are very stupid when it comes to electricity. Now as for Wagos. some indeed are rated from 12AWG down to 24 awg stranded. but not all, but that is very light gauge wire and not something typically used on a UL approved electrical devices. It is very important that you use only UL approved devices on household electrical systems. You will sometimes find 16 or18 awg stranded wire on approved light fixtures like LED types If the wire is lighter than that, I would avoid it. Cheap Chinese junk sometimes claims to be rated when it isn't. Think about it like this, if you or someone gets killed because what they made was unsafe or defective, what do you think your odds are of suing that Chinese company?? The answer, zero chance. And the Bing Fu company will just change its name to Wang bong. There is a lot of dangerous stuff out there, so you have to be careful and know exactly what you are doing. Stick with the low voltage battery stuff but be aware that lithium batteries can explode when short circuited. Be 100% certain that what you are doing is indeed safe. Keep in mind that even paper circuits can overheat and set the paper on fire. Learn Ohm's laws and know it by heart. volts, amps and ohms can be your friend for making simple circuits, but they can also be your enemy unless you fully understand it. There are things called breadboards which have a bunch of places you can insert small wires, resistors tiny buttons and switches, LEDs capacitors, diodes and transistors as well as some small chips. Supply them from a small battery pack. The components are cheap and you can buy learning kits to build. all sorts of cool things, This is a step up from paper circuits and helps you learn about electronic devices. If you do it wrong, the devices will let out their "magic smoke". Devices like capacitors,, LEDs , and diodes can go off like a fire cracker if you wire them wrong. Resistors can get very hot and burn up. But these are still pretty safe at low power levels. It is a good idea to get in the habit of wearing safety glasses because when one of these devices self destructs, they can spew out tiny bits of molten copper. You don't want that in your eyes. Best to get into this in some kind of school sponsored program with a teacher who knows what they are doing, some schools have good programs and some have things like little robotics classes or clubs, These can be pretty cool. but along with this, make sure you do good in math. The secrets of electricity are in the math and you need to know it well. Ever kind of science comes down to working with math. Electricity is an amazing field to get into. It's what makes the modern world work!! without it we might as well go back to living in caves! I've been an electrical engineer for a very long time and I teach all about electricity. and automation and things like robotic control, My students are HS Juniors and Seniors and I also teach adult classes to people in industry, have been working with electricity all my life. And I still love it. When you learn it, there are many good opportunities and different ways you can go. All these jobs pay pretty well because so few people learn it well. But please stay away from household electrical circuits, they can be deadly. the time will come down the line when you learn it all well enough. Even working with the small low voltage stuff, always have the power source turned off until you are ready to test and are sure that you got it right, Electricity can be a very powerful source, but you can't see it except at super high levels like lightning. As for Wagos, they are approved for use in household wiring, but as an engineer, I advise against using them, they have some flaws like high resistance, being made of dissimilar metals and using the very tiny spring force to maintain a connection. That said, a lot of "electrical installers" like them because they are very easy to use. but as you go through life, you will learn that easier is not always better. Note that in mu opinion, I don't consider most of these "installers" to be real electricians because most don't know the theory well enough and few are actually certified or licensed. You probably wouldn't want a DIY doctor performing surgery on you. Get electricity wrong and people can get killed as easily as if a make believe doctor worked on you! I didn't mean to pick on you, I just wanted to emphasize the importance of really knowing what you are doing with electrical. And be careful because there is a lot of bad information about electricity on the internet. It's not so easy to tell what is good and what isn't until you have mastered all the theory. Have fun and learn, but be careful. Electricity can be very dangerous stuff. It's often when you think you know, that you find out the hard way, that you have more to learn.

@@ElectricProAcademy I had the exact same question, so thank you both :) My old brittle BX / Cotton wrapped wiring I want to manipulate as little as possible so am loving them over wirenuts.

I would suggest using nylon insulated crimp on service sleeves

Not just that, many device manufacturers actually recommend wrapping a wire nut connection with electrical tape, which people would then unwittingly apply to all similar connections. I've seen this in the installation instructions for light fixtures, switches, and many smart home devices.

I was actually wondering exactly that, as I kept looking at charts saying 0.5067 mm^2 and 5.067×10^−4 mm^2 and not "one square millimeter" or similar. That's so bizarre, and so Imperial-System of us, to make it the equivalent OF something involving an inch, still avoiding anything metric. Ooof.

They're good stuff and have their place!

@@ElectricProAcademy , why are they any better than pushing wires into the back of a device, that by the way you don't like? Don't the Wago's work on the same principle? Not sure I would trust them.

Pete, I just rewatched that and I should've said, "MCM/KCMIL stands for the unit of area of a circle with a diameter of 1/1,000 of an inch." Thanks for graciously interjecting.

I agree Wago 221s are superb plus their technical documentation on it is a model for how manufacturers should be producing technical information on UK listed products.

@@ElectricProAcademy I agree with your statement about wire nuts over Wago s. A few places where I will use Wago’s is in heavy usage areas where a GFCI receptacle may go bad and need replaced over the lifespan of the house. Some electricians really crank down hard when pre twisting conductors for a wire nut and even the pigtails going to the receptacle is hard to at to replace the GFCI. Also a GFCI is larger than a standard receptacle and using WAGOs makes it much easier to get the all of the conductors and the GFCI back into the box

I would assume because Handymen do not need to be licensed therefore often times do not have the in depth knowledge of the litany of local trade codes.

The use of a particular wire size is up to the contractor. That being said I did not use any #14 wire in my home except as a light switch runner. All branch circuits were # 12 and dedicated circuits such as water heater, air cond., stove, RV service were sized according to the loads.

Why stop at #12? Use #10 so the electricity can really flow