The structural composition of a power cord
Release time:
2023-08-28
Source:
Internet
A power cord is a wire used to transmit electrical current. Typically, current is transmitted in a point-to-point manner. Based on their application, power cords are categorized into AC (alternating current) cords and DC (direct current) cords. AC cords generally carry high‑voltage alternating current; due to their higher voltage, they must meet standardized safety requirements and obtain official certification before they can be manufactured. In contrast, DC cords typically handle lower‑voltage direct current, so their safety standards are less stringent than those for AC cords. Nevertheless, for safety reasons, most countries still mandate uniform safety certification.
The structure of a power cord isn’t particularly complex, but don’t assume you can easily understand it at a glance. If you take the time to study it carefully, you’ll find that certain aspects still require a professional understanding of its construction.
The structure of a power cable primarily comprises an outer jacket, an inner jacket, and conductors; common transmission conductors include metallic wires made of copper or aluminum.
Outer sheath
The outer jacket, also known as the protective sheath, is the outermost layer of a power cable. It serves to safeguard the cable and boasts robust properties, including high‑temperature and low‑temperature resistance, resistance to natural light exposure, excellent flexibility, an extended service life, and environmentally friendly materials.
Inner sheath
The inner jacket, also known as the insulation jacket, is an indispensable intermediate layer in power cables. As its name suggests, its primary function is insulation, ensuring the safe transmission of electrical current and preventing any leakage between the copper conductors and the surrounding air. Moreover, the material of the insulation jacket must be flexible to ensure it can be securely embedded within the cable’s core layers.
Copper wire
Copper wire is the core component of a power cord; it primarily serves as the conduit for electric current and voltage. The density of the copper wire directly affects the cord’s quality. The materials used in the power cord are also a critical factor in ensuring quality, and the number of copper strands as well as their flexibility are additional considerations.
Inner sheath
The inner jacket is a layer of material that encases the cable between the shielding layer and the conductor core, typically made of polyvinyl chloride or polyethylene. Low-smoke, halogen-free materials are also used. It is applied in accordance with process specifications to prevent the insulation from coming into contact with water, air, or other substances, thereby protecting the insulation from moisture and safeguarding it against mechanical damage.
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