What Is Cable Cross-Section? Selecting 0.75 mm², 1 mm², 1.5 mm², and 2.5 mm² Cables

Cable cross-section is one of the most common technical terms encountered when selecting electrical cables. Values ​​such as 0.75 mm², 1 mm², 1.5 mm², and 2.5 mm² refer to the cross-sectional area of ​​the cable’s conductive cores.

Determining the correct cable cross-section is of great importance, particularly when selecting power cords with plugs, extension cords, power cables, AC power cables, and portable cable reels.

However, cable cross-section does not simply refer to “thickness.” Factors such as the cable’s electrical properties, the device it will power, cable length, the operating environment, and connection components must all be considered together.

At Power Kablo, we offer manufacturing solutions for selecting the appropriate cable type and cross-section for specific applications, covering everything from power cords with plugs to various electrical connection products.

What Does Cable Cross-Section Mean?

Cable cross-section refers to the cross-sectional area of ​​the conductor and is typically expressed in mm².

For example:

0.75 mm²
1 mm²
1.5 mm²
2.5 mm²

…are values ​​that indicate the conductor cross-section of the cable.

When we see the following designation on a cable:

3×1.5 mm²

…it means:

there are 3 conductive cores, and
each core has a cross-section of 1.5 mm².

Similarly, a 3×2.5 mm² cable contains three cores, each with a cross-section of 2.5 mm². Therefore, when ordering a cable, it is best to specify the number of cores, cross-section, cable type, and length together, rather than simply asking for a “1.5 cable.”

Why Is Cable Cross-Section Important?

Cable cross-section is one of the fundamental technical specifications to consider when designing an electrical connection.

However, there is an important distinction to be made here:

A larger cross-section does not necessarily mean the right cable for every situation.

When making the correct choice, the following factors must be evaluated together:

The device to be used,
The device’s power and current requirements,
Cable length,
Cable type,
Operating environment,
Plug and socket specifications,
Grounding requirements,
Relevant standards.

For instance, the technical requirements for a C13-C14 power cable used for a desktop computer may differ from those of a long extension cord used for other electrical equipment.

Power Kablo offers a variety of power cable solutions tailored to different devices and applications within its AC power and power cable product range.

What Is a 0.75 mm² Cable?

0.75 mm² is one of the conductor cross-sections commonly found in electrical cables.

It is particularly suitable for applications with lower power requirements. However, it is not accurate to determine the specific device a cable is suitable for based solely on the “0.75 mm²” specification.

One must also consider the cable’s:

number of cores,
cable standard,
insulation structure,
length,
plug or connector type.

For example, in Power Kablo’s various IEC power cable products, the cross-section, cable type, and connectors are all specified together. Therefore, when evaluating a C7 power cable, a C13 power cable, or a cable with a plug, looking solely at the mm² value is insufficient.

What Is a 1 mm² Cable?

A 1 mm² cable is a type of cable where each conductor core has a cross-sectional area of ​​1 mm².

A three-core product:

3×1 mm²

can be expressed in this format.

The three cores here—depending on the specific cable and application—may consist of phase, neutral, and earth conductors.

However, the cable’s actual suitability for use is not determined solely by the number of cores or the cross-section.

Especially in the production of extension cords and cables with plugs, the cable length and the intended load must be evaluated together.

Technical content from Power Kablo regarding the selection of the correct extension cord also emphasizes that cable cross-section, length, the device’s electrical requirements, plug/socket type, and the operating environment must all be considered together. (Cables with Plugs, Spiral Cables)

What Is a 1.5 mm² Cable?

A 1.5 mm² cable is a cross-section frequently encountered in electrical installations and various power connection applications.

For example:

3×1.5 mm²

indicates a three-core cable where each core has a cross-section of 1.5 mm².

This cross-section can be utilized—along with the appropriate cable type, length, and connection components—in applications such as extension cords with plugs, portable cables, and various power cabling setups.

Power Kablo’s product portfolio includes cable solutions with plugs in various cross-sections and lengths, and different cable cross-sections are also used in their portable cable reel products.

What Is a 2.5 mm² Cable? A 2.5 mm² cable is an option with a larger conductor cross-section compared to a 1.5 mm² cable.

For example:

3×2.5 mm²

refers to a three-core cable where each core has a cross-section of 2.5 mm².

Such cables may be preferred, particularly in applications with higher electrical requirements where appropriate technical conditions are met.

However, the same rule applies here as well:

The fact that a cable is 2.5 mm² does not automatically mean it is suitable for every device.

Factors such as cable length, load, connection components, the environment, and the method of use must all be considered together.

Power Kablo’s metal portable cable reel solutions also include models equipped with 3×2.5 mm² cable.

Cable Cross-Section and Cable Diameter Are Not the Same Thing

One common mistake made when selecting a cable is [confusing] cross-section with diameter…