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How to choose the right cable gland size?

Author    |    hongxiang_admin    |    June 19, 2024

Selecting the right cable gland size is essential to ensuring the safety and efficiency of your electrical installation. With so many options on the market, determining the best size for your specific needs can be overwhelming.

Factors such as cable diameter, thread size, and environmental conditions all play a role in choosing the right cable gland size. In this article, we’ll take a closer look at the factors to consider when selecting a cable gland size and provide you with practical tips to make the right decision for your application.

M8 - M120 metal cable gland with rubber seal

What is a cable gland?

A cable gland is a device used to secure and protect the end of a cable where it enters a piece of equipment, such as an electrical enclosure or junction box. It helps to prevent the cable from being pulled or twisted, and also provides a seal to protect against dust, debris, and moisture. Cable glands are usually made of metal or plastic and can be designed for use in various environments and applications.

Usage of cable gland

Cable glands serve two primary functions: providing connection protection and offering strain relief. Firstly, in terms of connection protection, cable glands play a crucial role in preventing external dust particles from accumulating on electrical equipment.

Furthermore, these components safeguard the exterior cable jacket, shielding both the wires and the electrical housing from environmental hazards such as dust and moisture.

When selecting a cable gland for a specific application, factors such as the type and size of the cable, environmental conditions, and the level of protection required must be considered. Proper installation and maintenance of cable glands is also important to ensure long-term performance and safety.

Importance of Correct Cable Gland Sizing

Correct cable gland sizing is critical to ensuring the safety, reliability, and efficiency of electrical installations. Cable glands are used to secure and protect cables from damage and also provide a means of connecting and sealing cables to equipment or enclosures.

Selecting the correct size cable gland is important because an undersized gland may not provide adequate protection for the cable, resulting in potential safety hazards such as short circuits, electric shock, or fire. On the other hand, an oversized gland may not provide a secure, tight seal, leaving the cable vulnerable to moisture, dust, and other contaminants.

M8 - M120 metal cable gland with rubber seal

Additionally, using the correct size cable gland ensures that the cable is properly secured and supported, which helps prevent stress on the connection and prolongs the life of the cable. It also helps maintain the integrity of the electrical system and prevent failures or performance issues.

Correct cable gland sizing is critical to the proper operation and safety of electrical installations, and it is important to consult industry standards and guidelines to ensure the correct size gland is selected for each specific application.

Steps to Calculate the Actual Size of a Cable Gland

Step 1: Determine the cable diameter

To ensure the correct selection of a cable gland, measure the diameter of the cable intended for use. Utilize precision instruments such as a caliper or measuring tape to obtain an accurate measurement.

Step 2: Consider cable gland size standards

Cable gland sizes are governed by various standards, including those established by the National Electrical Manufacturers Association (NEMA) and the International Electrotechnical Commission (IEC).

Step 3: Select cable gland material

When selecting a cable gland, it is imperative to consider the environmental conditions to which the cable will be exposed. Choose a gland made of material appropriate for the specific environment, with options including stainless steel, brass, or plastic. Key factors such as corrosion resistance, operational temperature range, and chemical resistance should play a pivotal role in your decision-making process.

Step 4: Consult a cable gland size chart or calculator

Numerous manufacturers of cable glands provide detailed size charts or online calculators. These resources are designed to help users determine the appropriate gland size by considering cable diameter and other specific requirements.

Step 5: Consider cable gland features

When selecting a cable gland, it is essential to consider not only the size but also other critical features such as thread type, ingress protection (IP) rating, strain relief capabilities, and relevant certification standards.

How to check you have the correct cable gland size?

It is critical to check that the measurements of your cable gland size are accurate.

To verify your measurements, check the following questions:

Does the diameter of the cable gland properly accommodate all the cables in your system?
Does the gland size have the correct pressure rating required for your application?
Is the gland mounting diameter large enough to accommodate your cable gland?
Is the depth and size of the cable gland PG or Metric?

If you need further assistance, professionals, such as the expert team at Hoonsun, can also help you verify the correct cable size.

How to choose a cable gland?

How to choose a cable gland that works perfectly with your application. Consider choosing a cable gland that comes from the same manufacturer as your entire system. This will ensure that your cable gland works effectively with your system.

Choosing products from the same manufacturer will make the process easier because the manufacturer will highlight any considerations and conversions that need to be taken into account when measuring the cable gland.

Choosing a cable gland is not as simple as choosing the right size. While finding the right size is a key factor, there are other factors to consider when choosing a cable gland, such as:

Usage: Could you please specify whether the cable gland will be utilized in a domestic, commercial, or industrial setting? This information is crucial as it impacts the selection of the appropriate material and type of cable gland.

Location: Another crucial factor to assess is the placement of the cable gland. Will it be installed in an indoor or outdoor environment? Furthermore, will its location subject it to exposure from dirt, dust, or other corrosive elements?

Temperature: When selecting the location for the cable gland, it is imperative to also take into account the area’s temperature conditions. Consider whether the cable gland will be subjected to extreme temperatures and if these temperatures are likely to vary significantly.

Atmosphere: Consider the overall atmosphere as well. Is the cable gland located in an area with explosive or corrosive elements? What precautions do you need to take to maintain the integrity of the cable gland?


Cable glands play a critical role in numerous industries. So selecting high-quality cable glands is of utmost importance. At Hoonsun, we take pride in being a premier provider of cable and wire protection solutions.

Alongside our wide range of cable glands, we offer products for industries like marine, power generation, aerospace, industrial, and telecommunications. Contact the Hoonsun team to see how our high-quality products, quick responses, and fast turnaround can boost your business.

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