It came across to me quite frequently online that people state "neutral wire does not carry current." I thin this is a false statement. My reason is the following.
For the electrical panel in my home, I only saw three cables coming: red, black and white. I think the white is neutral. Red and black carry 120 V signal with opposite phase. For most breakers on my panel, only two wires are connected, either red and white or black and white.
Let's take red and white for example. The red and white wires will go from the breaker to appliance, say a toaster. When toaster is working, a current flows in the circuit, and I think there is equal amount of current in the red and white wires. Thus the neutral white does carry current.
Why the current on neutral won't hurt people? My understanding is that although it carries current, the potential difference from neutral wire and ground (e.g. home subfloor or true electrical ground) is very small (less than 1 V according to my measurement). Therefore, even if you touch the neutral with bare hands, the current (could be large!) on the neutral wire won't enter your body, because the neutral wire is so much more conductive than human body that effectively all the current flows only on the neutral wire, bypassing the human body.
Please correct me if I am wrong. Thanks!