- Is red wire live or neutral?
- Is red wire the same as black wire?
- Is red usually positive or negative?
Black (neutral) Red (live) Green and yellow (earth)
Red: Hot Wire Like black electrical wires, red wires are also hot or live wires. Red can also be the connecting wire between two smoke detectors that are hardwired. Also, if your circuit box is wired for 240 volts instead of 120 volts, you may even see both red and black wires.
Conventions for identification In DC circuits, the positive pole is usually marked red (or “+”) and the negative pole is usually marked black (or “−”), but other color schemes are sometimes used in automotive and telecommunications systems.