Trystan Casey
Power cords are electrical cables that connect devices to a power source. They are typically insulated and made from copper or aluminium. Power cords are subject to various national and international standards to ensure safety and compatibility. In the United States, power cords must meet UL Standards 62 and 817. The terms power outlet, power point, outlet, receptacle, and socket are often used to refer to the place on the wall where a power cord is plugged in.
Characteristics and Values of Power Cords
| Characteristics | Values |
|---|---|
| Purpose | To link appliances to a power source or electrical utility |
| Construction | Insulated electric cable with connectors moulded onto one or both ends |
| Ends | One end has a male plug that connects to an electrical outlet, wall socket, or extension cord; the other end has a female connector that attaches to the appliance or another male plug |
| Accessories | Fuses for overcurrent protection, a pilot lamp to indicate voltage, or a leakage current detector |
| Safety | Plug covers are used to prevent children from inserting objects into socket holes |
| Safety Standards | UL Standards 62 and 817, National Electrical Code (NEC), and International Electrotechnical Commission (IEC) 60320 |
| Conductors | High-conductivity copper or aluminium |
| Insulation | Rubber or thermoplastic to prevent direct contact with live wires and reduce electric shock risk |
| Applications | Residential, commercial, and industrial |
| Examples | Television, computing devices, refrigerators, air conditioning units, dryers |
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What You'll Learn
Power cords have male and female connectors
The device that plugs into a wall to provide more electrical sockets is called a power outlet, power point, receptacle, or socket. In the US, it is commonly referred to as a power strip.
The gender of connectors is designated by analogy with male and female genitalia. The male connector is the part that bears protrusions or fits inside the other, while the female connector has indentations or fits outside the other. In electrical connections, the part that is permanently connected to the power source is invariably female, with concealed contacts, to prevent inadvertent touching of live conductors. The male plug, with exposed contacts, is installed on the cord of the device receiving the power. This configuration is designed to enforce a sense of one-way directionality and ensure safety.
Power cords are subject to various national and international standards, such as the Underwriters Laboratories (UL) standards in the United States, to ensure safety and compatibility. IEC 60320 power cables, for example, come in normal and high-temperature variants, as well as different rated currents. The connectors have different shapes to ensure that a cable with a lower temperature or current rating cannot be substituted.
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Safety standards for power cords
Power cords are subject to various national and international standards to ensure safety and compatibility. In the United States, power cords must meet UL Standards 62 and 817. The National Electrical Code (NEC) provides guidelines for electrical installations, including the use of flexible cords.
Two key Underwriters Laboratories (UL) standards relevant to power cords are:
- UL 62: This standard specifies the requirements for flexible cords and cables, including their construction, performance, and safety characteristics. It covers insulation, conductor materials, and temperature ratings, ensuring cords can handle specified voltages and environmental conditions.
- UL 817: This standard pertains to cord sets and power-supply cords, detailing requirements for moulded-on or assembled-on fittings, strain relief, and overall cord construction.
IEC 60320 power cables come in normal and high-temperature variants and various rated currents. IEC 60320 connectors have different shapes to ensure that a cable with a lower temperature or current rating cannot be substituted. IEC 60320 connectors also have different types of exterior jackets to accommodate environmental variables such as moisture, temperature, oils, sunlight, flexibility, and heavy wear.
The Occupational Safety and Health Administration (OSHA) provides further safety standards for power cords, particularly in the context of workplace safety. OSHA requires flexible cords to be rated for hard or extra-hard usage, with markings indicating this rating approximately every foot along the cord. Examples of these codes include S, ST, SO, and STO for hard service, and SJ, SJO, SJT, and SJTO for junior hard service.
OSHA also mandates visual inspections of power cords and associated equipment for external defects and damage before use. This includes checking for loose parts, deformed or missing pins, and damage to the outer jacket or insulation. In addition, employees' hands must be dry when plugging and unplugging flexible cords to prevent electric shock.
Other OSHA safety standards for power cords include:
- Flexible cords must not be used for raising or lowering equipment, and they must not be fastened with staples or hung in a way that could damage the outer jacket or insulation.
- Overcurrent protection of circuits and conductors must not be modified beyond what is allowed by installation safety requirements.
- Only qualified persons may perform testing work on electric circuits or equipment.
- Flexible cords used in conductive work locations, such as those with water or other conductive liquids, must be approved for those locations.
- Locking-type connectors shall be properly secured after connection.
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Power cords vs power strips
A power cord, also known as an extension cord, is used to extend the reach of your power source. It is a flexible electrical cable with a plug at one end and a socket, or multiple sockets, at the other. Extension cords are designed to handle power loads and are used for powering appliances, construction equipment, and industrial machinery. They are also useful for outdoor events, working with power tools, or using electronic equipment in a backyard or garage setting.
International power cords are used with electrical appliances in countries other than those they were designed for. They often require a voltage converter to protect electronic devices from differing voltages.
Power cords are subject to various national and international standards to ensure safety and compatibility. For example, in the United States, power cords must meet UL Standards 62 and 817, which specify requirements for flexible cords and cables, including their construction, performance, and safety characteristics.
On the other hand, a power strip, also known as a power bar, is a cluster of sockets connected to one power cord. It allows you to plug multiple devices into one wall outlet, efficiently powering several electronics simultaneously. Power strips are useful when you have multiple devices that need power in the same area, such as in offices, entertainment centres, or home workshops.
Power strips should have a circuit breaker to prevent overloading, and some are also surge-protected. They may also have a shut-off switch.
Both power cords and power strips are useful tools for extending power and plugging in multiple devices. The best option depends on the specific needs of the user, such as the number of devices they need to plug in and the distance from the power source.
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International power cords
Power cords are subject to various national and international standards to ensure safety and compatibility. International power cords are used in conjunction with electrical appliances in countries different from those in which they were designed to operate. These cords have one end that is compatible with receptacles or devices from one country, and the other end is compatible with receptacles or devices from another country.
When using international power cords, it is important to consider the different voltage requirements of the countries involved. A voltage converter may be necessary to protect electronic devices from damage due to differing voltages. For example, devices designed for use in the United States may require a voltage converter when used in countries with different voltage standards, such as Europe or Africa.
In addition to voltage considerations, international power cords may also have different types of exterior jackets to accommodate environmental variables such as moisture, temperature, oils, sunlight, flexibility, and heavy wear. It is important to know the type of plug and the socket requirements of the destination country when choosing an international power cord.
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Insulation and protection
Insulation:
The process of insulating wires involves covering them with protective materials to safeguard the wiring and prevent electrical hazards. Insulation is crucial for several reasons:
- Safety: Insulation protects against electric shock, a critical safety hazard. Exposed wires, worn insulation, or removed insulation can pose serious risks, as recognised by the Occupational Safety and Health Administration (OSHA).
- Protection of Wiring: Insulation shields the wiring from damage and environmental factors. It prevents wires from touching each other or contacting framework or grounding components, ensuring the electrical system operates correctly.
- Material Protection: Insulation protects the materials that comprise the wiring, such as copper and steel, from exposure to elements like water, which can cause corrosion. This prolongs the lifespan and effectiveness of the wiring.
- Electrical Leakage Prevention: Insulation prevents electrical leakage, which occurs when energy transfers to other components like the framework or neighbouring wires.
- Standardisation and Consistency: Electrical wires are colour-coded according to specific standards. These colour codes provide consistency and help electricians identify wire functions and voltage ratings quickly and easily.
Protective Coverings:
There are three primary types of protective coverings for electrical wires: armour, jacket, and insulation. Each type serves a distinct purpose and offers varying levels of protection:
- Armour: Typically constructed from galvanised steel or aluminium interlocked armour (AIA), armour provides mechanical protection in commercial applications. It is akin to having built-in conduit protection for the wire.
- Jacket: The jacket is an outer covering that shields the wire from environmental factors. It is usually made from non-metallic materials like nylon or PVC. The jacket protects the insulation around the wire when it is pulled through a conduit and can also reduce friction during the installation process.
- Insulation: Insulation itself is a form of protection, and various materials can be used for this purpose, including PVC, XLPE, rubber, and chlorosulfonated polyethylene (CSPE). The choice of material depends on factors such as temperature range, flexibility, resistance to chemicals and abrasion, and toxicity in the event of a fire.
Safety Standards and Guidelines:
To ensure safety and compatibility, power cords and electrical wiring are subject to various national and international standards:
- UL Standards: In the United States, power cords must comply with UL Standard 62, which outlines requirements for flexible cords' construction, performance, and safety characteristics, including insulation specifications. UL Standard 817 pertains to cord sets and power-supply cords, detailing requirements for fittings and overall cord construction.
- National Electrical Code (NEC): The NEC provides
In conclusion, insulation and protection are vital aspects of electrical wiring within walls. They safeguard individuals from electrical hazards, protect wiring and materials, and ensure the proper functioning of electrical systems. By adhering to safety standards and employing appropriate protective coverings, such as armour, jackets, and insulation, the risks associated with electricity can be effectively mitigated.
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Frequently asked questions
An electric cord in a wall is called a power cord.
A power cord is a cable with a plug at one end and a socket, or "female connector", at the other.
A female connector is the end of a power cord that attaches to an appliance. The male plug, on the other hand, connects to an electrical outlet, wall socket, or extension cord.
Power cords are used to link appliances to a power source. They are used in both residential and commercial environments and are fundamental parts of electrical distribution systems.
Power cords come in various types to accommodate different environmental variables such as moisture, temperature, oils, sunlight, flexibility, and heavy wear. For example, a cord designed for use with a heating appliance may be able to withstand accidental contact with heated surfaces.
