How to differentiate N and E by DMM?

Easy, only the N will have current when load is running and E show 0A.


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Earth = 0 volts, dead zero, the more zeroes the better.

Neutral = Will have very low VAC reading, it is never 0 volts AC, 0.5VAC isnt zero volts. It can be high reading like 5 or 10 VAC which isn't good since it adds up to the AC phase.

Henceforth test pen is a quick and useless tool to tell apart Earth & Neutral. That is the only reason why some see no difference in wiring until the mains is switched on. The test pen will never light up on a Neutral since its so low voltage.

Also be mindful that the test pen will light up with relatively low voltage, ie 50VAC.

Do be cautious if you are not trained & experience in measuring live voltage.

Measured with respect to (wrt) what? After all, you can't connect only one probe of the multimeter and measure a voltage.

Again, measured wrt to what? If you say measured wrt to Earth, the N and E wires are independent to each other (for M'sia standard wiring) so any stray voltages on the wires do not complete a circuit. Does it matter what small voltage it is at all, as long as the L-N voltage is 230Vac?

I don't understand the point of the sentence.
"quick and useful"
"slow but useful"
"useless", and it doesn't matter if it is quick or slow as it is useless. E.g a hammer is a useless tool to measure voltage. Once useless, then quick or slow doesn't play a part anymore.

If the testpen lights, then isn't this "safe"? After all, you won't touch a wire if the testpen lights. The problem is that the testpen doesn't light even if there is a voltage present. A false positive makes you more cautious, and hence safer, no?

Hi
I have an Oven 3300kw @16amp and gonna wired to a 20amp 2 pole isolated switch. So the mains incoming 16amp DB wires is going to connect to LINES in the switch and the oven cable to the LOAD on the Switch.

Any issue with this?Just want to make sure that contractor is doing it right.

There are N1 and N2, I understand N stands for Neutral, but how to differentiate which is 1, which is 2 ?

i'm not sure which device u're referring to.
really need to check the spec/wiring diagram of the exact device.

however in general (what i've encounter so far)

the numbered terminal usually be in/out:

like 2 pole switch for example should have 2 N and 2 L.
meaning incoming N and L and outgoing N and L.
thus simple way to mark it would be N,N1 or N1/N2 etc.

slight difference:
for 2-way / 3-way switch you will find common L1/L2 and so on

This post has been edited by ungka: Jul 6 2023, 04:08 PM

Would like to know if anyone can help here. This is a 2 gang switch.

The 2 reds coming down is Live I think.
Yellow connecting the 2 red is Live too I supposed.

The yellow going up beside d red wire I think is to Load or the light switch.

But the blue is Neutral I guess.
Grey to S1 is Load 2 / light 2

But I don't know the yellow with tape entering no1 is what wire?
Grey with tape 03 is what wire?

Thanks all



This post has been edited by ljm: Jul 10 2023, 04:10 PM

Is that a smart switch? if yes,

Yellow to no1 is to light.

Grey No3 is to light also.

The yellow is previously connected to the right side switch. Take out and connect to the No1 smart switch.