![]() Most of Europe abides by IEC (International Electrotechnical Commission) wiring color codes for AC branch circuits. The current flows from the positive terminal to the external circuit and returns to the negative terminal.ĪC Power Circuit Wiring Color Code Standardsĭifferent countries or regions have different AC power circuit wiring color code standards, of which the most important ones are illustrated below. Usually, DC systems are of 2-wire or 3-wire types, of which a DC power has two terminals, one positive (+) and the other negative (-). This grounding system is called TN-C-S by IEC 60364 or GB 16895.ĭC distribution is limited to use in situations such as tramway and traction systems with a voltage of usually 600V, railway DC traction systems with a voltage of 1.5 kV between rail and overhead collector wire, lifts, printing presses and various machines where smooth speed control is desirable, electroplating or is simply used for battery charging. Note: Before the power supply enters the home, the PEN (Protective Earth and Neutral) will be grounded and then divided into PE (earth wire) and N. In the 380V low-voltage distribution network, the N line is set to obtain the 220V line voltage from the 380V phase voltage, or for zero-sequence current detection in order to monitor the balance of three-phase power supply.įigure 1: Example of Electrical Wiring Systems The zero line normally passes current to form a current loop in the single-phase line, while in a three-phase four-wire system, the three phases form a loop, and the neutral line is normally without current. The neutral line in a three-phase four-wire system is different from the zero line or neutral line which enters the user's home in a single-phase transmission line. In the low-voltage (the normal voltages of 240V and 415V delivered to most customers) distribution network, the transmission line generally adopts a three-phase four-wire system, of which three lines represent the three phases of L1, L2, and 元 respectively, and the other is a neutral line N. Electrical wiring color code standards are specified according to different power distribution branch circuits: AC (alternating current) and DC (direct current).ĪC is widely used in distribution and transmission electrical networks. It is important to abide by the electrical wiring color code standards for safety concerns. The electrical wiring color code standards not only help in appliance addition, but also offer support when there is a need to replace the old wires with new ones. Given such potential hazards, electrical wiring color code standards is a necessity to be made. Therefore, keeping the consistency of the wire colors before and after adding the appliances is vital. People dealing with the wires may get electrocuted or the circuit won’t work due to the wrong connection. What would you do if there is no distinction of the three wires? If there is any mistake resulting in the misconnection of these wires, for example, the live wire is wrongly regarded as neutral wire or earth wire, big safety problems may occur. Imagining that a power link has been cut into two parts for an insertion of an additional appliance to support more electrical devices between the two parts. The third wire is the earth wire designed for important safety considerations. One wire brings electricity to the appliance and one wire completes the circuit by taking electricity away from the appliance, these two wires are called “live” and “neutral/zero” respectively. ![]() Why Are Electrical Wiring Color Codes Important?Įlectrical wiring color codes matter a lot even if there are safety features such as the fuse, the double insulation design and the earth wire in plugs and appliances for electrical connection.įor example, in a home electrical system, there are usually three wires/lines in a power cord or in the whole power link entering into buildings.
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