How Small Component Ratings in Power Cords Prevent Electrical Failures

In the world of electricals, there are two main types of disaster: those caused by natural forces, such as lightning, and rare instances of humans having a fatal interaction with power lines and high-voltage equipment (AC power). However, small components can also cause electrical hazards that may otherwise go unnoticed when documenting electrical safety protocols.

While the tiny components found in a power cord or cord set may seem insignificant, they can cause equipment damage or present fire hazards, especially if they come in direct contact with a current. Incorrect usage or faulty design can cause devastating outcomes for humans and their surrounding environment.

Cord-Related Components

To prevent electrical failure, it is good practice to gain an understanding of the electrical ratings of the components being used.

For example, simple wire nuts are metal inserts typically comprised of coiled wire that are housed in small cone-shaped plastic sheathing for twisting wires together. These wire nuts typically have a current rating determined by the rating of the AWG or mm² cable: the same goes for crimped ferrules, ring terminals, spade terminals, and quick disconnects. The rating refers only to current; for instance, a 14 AWG cable is rated at 18 A. Consequently, the wire nut that holds the wires together for a 14 AWG cable will have a rating of 18 A.

If using 14 AWG cable wire nuts with 12 AWG cables, or attempting to fit a 16 AWG wire nut on a 12 AWG cable, the wire can fray or even be severed. It is also crucial to refrain from trimming larger wires to fit smaller terminals and to make sure that the wire is never pushed outward, which would cause it to become frayed. Trimming conductor wire presents multiple dangers due to the fact that the same current is being transmitted through fewer wires, which can cause heat issues. Furthermore, frayed wires carry a high risk of arcing, which is a considerable fire hazard.

When Components Fail, the Unthinkable Happens

January 28^th, 2026, marked the 40^th anniversary of the Challenger disaster, a horrific explosion which led to the disintegration of the space shuttle 73 seconds after lift-off. All seven of its crew perished, including six astronauts, one of whom was Judith A. Resnik, the second American woman in space, and Christa McAuliffe, a schoolteacher.

This disaster occurred because an O-ring on one of the solid rocket boosters failed to seal off highly pressurized gas. The leak was clearly visible soon after lift-off, with bright flames and billowing smoke seen by the millions of people watching. The Challenger was ripped apart in a matter of seconds, and to this day, the Challenger disaster and its crew are remembered by many.

This shows how seemingly small, inconsequential components in the electrical cable and power cord industry come with very real and serious consequences. The majority of cord sets can be inspected at the outlet visually to ensure the plug is correctly mated all the way into the socket, and the plug connector is seated correctly in its inlet.

A Real-World Plug and Socket Example

Routine checks of country-specific plugs or plug connectors are well worth one’s time. Cord manufacturers are required to meet stringent standards concerning the diameters of plugs, blades, and pins, and the materials used. The same standards apply to outlets and their components.

However, if operated by somebody in a rush or with weak hands, the plug and socket may not be fully connected, leaving a potentially dangerous gap. This gap could allow dust and debris to penetrate the contacts and expose the pins and blades which, if inserted deep enough into the outlet’s slots, may already be conducting current. Exposed blades and pins may also be bent or damaged by tools or other foreign objects.

One real-world case involved a query received by a customer technical support specialist at a particular cord manufacturer: the customer sent the manufacturer photos via email that displayed a close-up image of a plug pin that had been pitted with discoloration at the pin tip. The photo also showed a melted outlet with damage at the slot where the pin was inserted.

After examining the photos carefully with the full case details, the manufacturer quickly determined that there was a lack of full engagement between the male pin and its female contact or slot. In fact, it seemed that very little contact was made between the two, leaving the pin mostly exposed.

This was a case of pin arcing, which had pitted and discolored the tip, which had had minimal contact. If the pin had been inserted just a little further – in other words, seated as to conduct current (leading to zero resistance) – this would have prevented the arcing.

When microscopic imperfections are present in the material, the conditions are ideal for electrical arcs to form. If this arcing had occurred in a combustible environment where metallic, plastic, or chemical dusts were present in significant amounts, the outcome could have been a devastating explosion. This case proves that it is best practice to always take the time to inspect the connection.

This information has been sourced, reviewed, and adapted from materials provided by Interpower.

For more information on this source, please visit Interpower.