If you encounter wiring from a DC device, such as in solar cells or batteries, don't forget that the colors of the wire sheaths differ from AC wiring. Red: The red wire is positive. Black: The black wire is negative. White: The white wire is neutral or ground.
In the world of DC electronics, the accepted wiring convention is that the red wire carries the positive voltage, and the black is circuit ground. Usually the red is marked as + (plus) and the black is marked as – (minus).
Previously common 3-phase wiring features: Phase 1 = Red. Phase 2 = White. Phase 3 = Blue.
The three-phase system will be used to connect three or four wires to an electrical service panel. Three live wires in black, red, brown, or grey, as well as a separate blue wire, will be used. Between the two live wires, there will usually be a 400V difference.
The protective ground is green or green with yellow stripe. The neutral is white, the hot (live or active) single phase wires are black , and red in the case of a second active. Three-phase lines are red, black, and blue.
According to the international convention on a cable, the colours of the wire are; The live wire is in brown colour. The neutral wire is in blue colour. The earth wire is in green colour.
-The wires enter the building with colors to avoid the confusions for insulating these wires. The red wire is the live wire, and the black wire is neutral. The earth wire is given green plastic insulation.
Wire color codes are black, red, white, bare copper, green, white or gray, and blue or yellow. White, gray, bare copper, and green are the only wire colors that the NEC mandates must indicate a specific purpose. White or gray must be used for neutral conductors. Bare copper or green wires must be used as ground wires.
Ground is an arbitrary reference point you can choose wherever you want. All other potentials in the circuit are measured relative to ground. So by definition, ground is at 0 potential and it is neither positive or negative.
As per current Australian Standard, for most electrical installations, the electrical wiring colours used are brown for active, blue for a neutral, green or yellow-green for an Earth (ground).
The alternative is to locate your main switch board and count the number of poles on the main breaker. You can locate your main switch board next to the energy meter. If the main breaker has three poles, then the power supply to your household is three phase.
Blue = Neutral
The neutral wire colour is blue. The neutral wire transfers electricity away from the appliance to avoid overloading. It is located at the end of the circuit for connection after the electricity has flowed around the live and earth wires.
Three-phase installations are those formed by three different alternating currents that divide the installation into several parts which are reached by a constant power. Their standardised powers are currently adapted to 400 volts. Three-phase has four wires: three actives (called phases) and one neutral.
Red: The red wire is positive. Black: The black wire is negative. White: The white wire is neutral or ground.
Common colours include white or grey, which are both typically neutral, and black or yellow for active wires.
What do the Different Color Wires Mean? Here's a rundown of electrical wires: The black wire is the "hot" wire, it carries the electricity from the breaker panel into the switch or light source. The white wire is the "neutral" wire, it takes any unused electricity and current and sends it back to the breaker panel.