As an electrician newbie I have a question..
My power plug is attached to the wall outlet and three wires are at the end of it.. the blue, the brown and the green/yellow oen.
How to determine which is the live, zero and ground wire WITHOUT depending on the colouring? I want to know this to always be able to check the wiring, if I don't trust it.
Also, I have these sub questions that follow from my situation:
- Why does the test screwdriver lit up when connected to the apparant zero line?
- How can I determine the live/zero line using a multimeter
- a test screw driver
- a multimeter
- the ANET A6 manual
In the manual it states that
- brown is the live wire
- blue is the zero wire
- green/yellow is the ground wire
I know that in some countries this colour coding is the standard and can be trusted. I just want to be able to check it.
So, my first hypothesis would be.. if I put the test screw driver on the live (brown) wire, lay my thumb on the end, the internal bulb would glow. This did not happen. It did happen when I put it on the zero (blue) wire. So I am a bit confused by this.
My second trick was using the multimeter. Using the positive and negative probes to determine the polarity and therefore decide how the current was flowing. But there was no sign of polarity... duh.. because I was of course on AC, which is always Alternating.. hence no sign information from a multimeter. So, how CAN I use a multimeter to determine the live/zero line? Maybe measure the current from live/zero to ground? Is that a safe option?
PS: my first post on this forum.. so please correct me where needed