Tag: alternating current

Alternating Current

How an Electrical Cable is made

Electrical cables are the backbone of a powered society. They carry electrical currents, allowing us to connect to power in all aspects of our lives. From industrial machinery and manufacturing equipment to medical equipment and everyday devices and appliances, these cables ensure that electricity moves safely and efficiently where needed.

But how are electrical cables made? Keep reading to learn more!

What Is an Electrical Cable?

Electrical cables are designed to carry an electrical current from one element to another. They consist of conductors, which are insulated wires suitable for carrying electrical current. Electrical conductors are made from metals such as copper and aluminum. Most wires are made from copper because it conducts electricity with high flexibility and very little resistance.

Electrical wires come in solid-core, stranded, or braided configurations to form a single assembly. The ends connect to two devices, allowing electrical signals to transfer between them. Electrical cables are assemblies of multiple conductors bundled together to transmit electrical power and signals.

How Electrical Cables Are Made: The Process

Step 1

The first stage in the manufacturing process of a conductor is the wire-drawing. Wire-drawing involves gradually reducing the wire’s diameter to its final size. After the diameter is reduced, the wire is drawn further to achieve the required size for each conductor type.

Step 2

In the second stage of this process, the wires undergo a heat treatment called annealing. Annealing is a process of heating metal and slowly cooling it to remove internal stresses and toughen the metal. The purpose of this treatment is to increase the wire’s conductivity.

Step 3

The next step is to add insulation. Because the current runs along the outside of the copper wires, there must be insulation between the inner conductor and the outer conductor. Insulation is the layer of synthetic materials that is applied over conductors for electrical isolation between other wires, conductive surfaces, or from the ground. An inner conductor insulation also prevents any current leakage.

Step 4

Some cables may require additional elements to improve protection. For instance, electrical coverings called “screens” insulate the signals that circulate in the cable, shielding the power cables from external interference.

Step 5

Once the cable’s inner insulation is applied, it requires an outer insulation, called the jacket. The jacket is applied over the insulation for mechanical, environmental, chemical, and electrical protection.

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The Difference Between AC and DC Power

There are two types of current flow in a circuit: Alternating Current (AC) and Direct Current (DC). Understanding the difference in circuitry and application use of AC and DC power is essential when selecting electrical components. There are significant differences between, say, AC inlets and DC inlets, or AC power cords and DC power cords. Consumers interact with power cords and electronic devices daily in a plug-and-play manner; however, OEMs must also consider how current affects the performance and operation of their equipment and account for various factors during the design process.

Here, we examine the differences between AC and DC power, how these currents affect industrial systems, and how to select the appropriate current for different applications.

AC vs DC: What’s the Difference?

AC stands for Alternating Current. AC power relies on a rotating magnet that causes electrons to switch direction repeatedly. The amount of energy carried through AC is economical to transfer over longer distances and provides more power. Most industrial equipment connects to power using AC inlets and AC power cords.

DC stands for Direct Current. With DC, a steady magnetism along the wire ensures that current can only flow in one direction. This provides a stable power supply for electronic equipment. DC power cords are often used to connect low-voltage circuits and systems that require clean, consistent power.

Transmission of AC and DC Power

AC power is the dominant form of electrical transmission because it can be safely used at both high and low voltages, as well as for long-distance transport. It minimizes line loss and supports large power distribution networks. Until more recent years, with the proliferation of data centers, AC power had been the predominant power architecture.

DC transmission requires more complex and costly conversion equipment, typically making AC transmission more popular. However, modern high-voltage DC systems (HVDC) reduce power losses over long distances, making DC transmission particularly relevant for data centers and industrial operations.

Why Many Industrial Systems Use DC Power Internally

Most industrial equipment is powered with an AC inlet. However, many systems convert the incoming AC to DC immediately after power entry. DC is often preferred for these operations because its unidirectional flow provides a stable, consistent voltage required for downstream electronics. Converting AC to DC power for internal use prevents damage to sensitive equipment from AC power fluctuations and improves efficiency.

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The Risks of Male-to-Male Extension Cords

Why You Should Never Use a Male-to-Male Power Cord

Male-to-male extension cords are widely considered to be one of the most dangerous cord styles. Often referred to as “suicide cords,” these cables create serious safety hazards that can lead to electric shock, electrocution, fire, and property damage. Despite being sold online, male-to-male cables are not code-compliant nor safe to use.

What is a Male-to-Male Extension Cord?

A male-to-male extension cord is a cable with male plugs on both ends, rather than the standard design with one male plug and one female receptacle. While at first glance, this may seem like a solution for connecting two female receptacles, in actuality, this is a very dangerous design. Once one end of the male-to-male cord is connected, the cable carries live energy, and there is no safe way to handle or connect the opposite end. The overall design of this cord style ignores basic safety rules and regulations for electrical devices.

The Major Safety Risks and Hazards of Male-to-Male Power Cords

Using male-to-male extension cords is dangerous and can cause damage to users, electrical equipment, and property. The Consumer Product Safety Commission (CPSC) has issued formal warnings against the use of male-to-male cords, as they can increase the risk of:

  • Electrocution: Can occur from exposed live prongs and cause electrical shock.
  • Fire hazards: These cords bypass built-in safety protections and can increase the chance of electrical fire and overloading.
  • Backfeeding: The dual male plugs can cause backfeeding, where electricity flows in reverse and bypasses safety systems.
  • Carbon monoxide poisoning: Incorrect circuits and generator placement can reduce the efficiency and accuracy of CO detectors.

Code Compliance and Safety Requirements

Not only do male-to-male extension cords pose significant safety risks, but they also fail to meet established electrical safety protocols. While the National Electric Code (NEC) doesn’t specifically mention male-to-male cords by name, it does prohibit equipment that creates hazardous conditions. The exposed live prongs and unsafe handling and conditions of male-to-male cords violate the NEC code. So, not only are they dangerous to use, but they could also lead to inspections and/or fines.

Additionally, Underwriters Laboratories (UL) and the CPSC do not recognize or certify male-to-male extension cords, meaning any products produced and sold as such have not passed the required tests and approvals for electrical safety.

Alternative Solutions for Male-to-Male Extension Cords

If you need to connect two female receptacles or other equipment, there are better solutions than using male-to-male extension cords. Consider:

  • Standard extension cords: Reroute your existing equipment so a standard cable with one male plug and one female receptacle can safely connect your devices.
  • Transfer switches: These act as miniature circuit breakers to safely connect a generator to an electrical system without backfeeding.
  • Inlet boxes: Designed specifically to prevent backfeeding and power overload.
  • Interlock devices or kits: These help ensure power can only flow in one direction, which is safer than male-to-male extension cords.

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