Extension cords are used to transfer electrical energy over a greater distance from the electrical outlet to the device. They can be single-phase or three-phase, depending on the electrical system used.
Single-phase Extension Cords:
Used for household purposes: Most commonly used in homes, offices, and small projects.
Voltage: Operates at 220–240 V, using a single phase.
Typical power: Suitable for small loads such as household appliances, lamps, computers, and other lightweight devices.
Number of sockets: Can have one or several sockets, often equipped with overload protection.
Wire thickness: Usually thinner than three-phase extension cords, as it carries less power.
Three-phase Extension Cords:
Used in industry: Designed for industrial equipment and large loads such as motors, compressors, or large construction equipment.
Voltage: Operates at 380–400 V, using three phases.
High power: Intended for large loads, supporting more powerful devices.
Connections: Three-phase extension cords often have special connectors (e.g., CEE connectors) that ensure safe high-power transmission.
Wire thickness and insulation: Thicker wires with stronger insulation to safely carry higher power.
Important aspects:
Overload protection: Extension cords, especially three-phase ones, often have protection against overload or short circuits.
Resistance to environmental conditions: Three-phase extension cords designed for industrial use typically have a robust coating that protects against moisture, dust, and mechanical damage.
Length: Both single-phase and three-phase extension cords can vary in length—from a few meters to hundreds of meters, depending on needs.
Applications:
Single-phase extension cords are most commonly used at home, for small electrical devices or power tools.
Three-phase extension cords are essential in industry or construction, where working with more powerful devices is necessary.
When choosing an extension cord, it is important to consider the power of the equipment used, the voltage, and the environmental conditions in which the extension cord will be used.
