I know in america (not spain) since you have 120VAC you don't know what leg of the 220 your outlet is plugged into, that's why people always say its a 50/50 shot if you blow up your scope.
I know in america (not spain) since you have 120VAC you don't know what leg of the 220 your outlet is plugged into, that's why people always say its a 50/50 shot if you blow up your scope.
Neutral will normally be NEAR ground, but depending on where they are commoned there will be a voltage between them, caused by Neutral conductor current. This will of course be a very low impedance source. It is not sensible or reasonable to expect a probe ground lead to short this current, regardless of any fault condition or not!
Neutral will normally be NEAR ground, but depending on where they are commoned there will be a voltage between them, caused by Neutral conductor current. This will of course be a very low impedance source. It is not sensible or reasonable to expect a probe ground lead to short this current, regardless of any fault condition or not!I have like 40 volts between neutral and ground, that's what I'm talking about xD and that's why I want to measure mains, because something is wrong with my electrical installation.
First the question was "The question is: is it safe to measure mains 220AC with [a scope]... Again, I know the answer, it is safe.... "
That mutated into "Listen, asking if I can measure mains voltage is my way to ask if I can measure hundreds of volts of anything with the oscilloscope (assuming that voltage is below probe & oscilloscope limits). It's not like I feel fascination for mains."
And we now find that all he wants to do is find a gross fault in his mains installation. Nothing subtle.
If you're not absolutely sure you can test this safely - call an electrician.
If you're not absolutely sure you can test this safely - call an electrician.
Of course, that doesn't work where the Dunning-Kruger syndrome is present.
If you're not absolutely sure you can test this safely - call an electrician.
Of course, that doesn't work where the Dunning-Kruger syndrome is present.Do you think that just because I want to learn? Because I'm here for that, to Learn (did you learn or you were born knowing electric engineering?), it's very sad that you laugh at unexperienced users that want to learn, denota mucha falta de humildad.
If you're not absolutely sure you can test this safely - call an electrician.
Of course, that doesn't work where the Dunning-Kruger syndrome is present.Do you think that just because I want to learn? Because I'm here for that, to Learn (did you learn or you were born knowing electric engineering?), it's very sad that you laugh at unexperienced users that want to learn, denota mucha falta de humildad.
Nice video but...I know in america (not spain) since you have 120VAC you don't know what leg of the 220 your outlet is plugged into, that's why people always say its a 50/50 shot if you blow up your scope.
No - The issue has nothing to do with which leg (L1 or L2 in the North American split phase 120/240V system) the particular branch circuit you are plugged into is utilizing.
Neutral will normally be NEAR ground, but depending on where they are commoned there will be a voltage between them, caused by Neutral conductor current. This will of course be a very low impedance source. It is not sensible or reasonable to expect a probe ground lead to short this current, regardless of any fault condition or not!I have like 40 volts between neutral and ground, that's what I'm talking about xD and that's why I want to measure mains, because something is wrong with my electrical installation.
However, in your original post you did write "...Again, I know the answer, it is safe...".
A quien no pide consejo, darlo es de necios.
Hi, I'm new here, I hope you can help me with this. I already know the answer, so the reason I'm asking for this is because I want to make sure that my house won't burn.
....
The question is: is it safe to measure mains 220AC with A-B operation so probes ground clips are not used? (assume the probe is x10)
Again, I know the answer, it is safe. I just want to make sure, you guys are more experienced than me.
If you're not absolutely sure you can test this safely - call an electrician.
However, in your original post you did write "...Again, I know the answer, it is safe...".That's because I know the theory, and the theory says that the voltage I want to measure is below probe and oscilloscope limits.
But practice is other story, you guys are more experienced and that's why I'm asking, because I do know that I can measure that IN THEORY, but in practice, anything I have not take care of could go wrong.
Aaaand talking again about it, what if I build a voltage divider with a few megaohm resistors?
Neutral will normally be NEAR ground, but depending on where they are commoned there will be a voltage between them, caused by Neutral conductor current. This will of course be a very low impedance source. It is not sensible or reasonable to expect a probe ground lead to short this current, regardless of any fault condition or not!I have like 40 volts between neutral and ground, that's what I'm talking about xD and that's why I want to measure mains, because something is wrong with my electrical installation.
My neutral has 40 volts on it too when I put the meter between it and ground. Is this caused by coupling from the wires all running next to each other? How much current roughly would this 40 volts put out? Could I run a 5W light bulb off it or even an LED? Or would it disappear as soon as you put any load on it.
Nice video but...I know in america (not spain) since you have 120VAC you don't know what leg of the 220 your outlet is plugged into, that's why people always say its a 50/50 shot if you blow up your scope.
No - The issue has nothing to do with which leg (L1 or L2 in the North American split phase 120/240V system) the particular branch circuit you are plugged into is utilizing.
Care to elaborate what the issue is? Usually when you tell someone they are wrong you explain why.
My neutral has 40 volts on it too when I put the meter between it and ground. Is this caused by coupling from the wires all running next to each other? How much current roughly would this 40 volts put out? Could I run a 5W light bulb off it or even an LED? Or would it disappear as soon as you put any load on it.
...but we don't want to encourage wrecklessness...
Putting a load of more than a couple of mA between a 'high' neutral and ground will trip any RCD or GFCI on the circuit, unless the ground wire is broken somewhere, and in that case it will put a dangerous voltage on the exterior metalwork of all grounded equipment plugged into the same circuit.