A cable gland secures a cable to an enclosure, seals the entry point, and relieves strain on the terminations. Knowing how to install cable gland correctly means four things. Match the gland to the cable, prepare the cable end, tighten each part in order, and test the seal.
- How does it work? The gland clamps the cable, compresses a seal around the sheath, and locks into the enclosure thread.
- When do you use it? Use it whenever a cable enters a panel, junction box, motor terminal box, or hazardous-area enclosure.
- What does it involve? You need the right gland size, basic hand tools, a clean cable cut, and a few careful minutes per gland.
Why does this small part matter so much? Because a poorly fitted gland breaks the enclosure’s ingress protection. Moisture, dust, and vibration then reach live terminals. In hazardous areas, a wrong installation can also void the explosion protection.
This guide explains how to install cable gland types used on global industrial projects. They range from simple nylon fittings to certified brass glands. It covers standard, armoured, and flameproof glands. It also lists common mistakes, test checks, and answers to frequent questions. Our team at Cabex India supplies glands to Europe, the UK, Australia, and the Middle East. As a result, the steps below reflect real site practice.
What Is a Cable Gland and Why Does Installation Matter?
A cable gland is a mechanical fitting that connects a cable to electrical equipment. It grips the cable, seals the entry hole, and keeps the earth path intact on armoured cables. Engineers also call it a cable connector, cable fitting, or cord grip.
Installation matters because the gland decides the enclosure’s real protection level. According to the IEC guide to IP ratings, an IP68 rating means the equipment is dust-tight. It also resists continuous immersion under conditions the manufacturer specifies. In practice, that rating only holds when you fit the gland exactly as instructed.
For example, a gland rated IP68 can still leak if the compression nut is loose. Likewise, an over-tightened nut can crush the cable sheath. Both errors shorten the life of the installation.
What Tools and Parts Do You Need Before You Start?
Gather everything before you open the enclosure. First, check that the parts match the job. Then confirm the tools are in good condition.
Parts to check:
- Gland body, compression nut, and seal
- Locknut and sealing washer or O-ring
- Earth tag and shroud for armoured glands
- Blanking plugs for unused entries
Tools to have ready:
- Two correctly sized spanners
- Cable knife and armour cutter
- Tape measure and marker
- Torque wrench, where the manufacturer gives torque values
Next, verify four details. The cable outer diameter must fall inside the gland’s sealing range. The thread type, such as metric, PG, NPT, or BSP, must match the entry. The entry hole must have the correct size and a clean edge. Finally, the gland’s IP rating and hazardous-area certificate must suit the site.
Basic Rules That Apply to Every Installation
Before you learn how to install cable gland models in detail, remember five universal rules. They apply to nylon, brass, and stainless steel glands alike.
- Read the data sheet. Each manufacturer lists the cable range, torque, and thread details.
- Match the material to the site. For example, stainless steel suits marine and chemical areas, while brass suits general industry.
- Keep parts clean. Dirt on a seal or thread causes leaks.
- Use the right spanner. Pliers round the flats and damage the finish.
- Never mix brands. Parts from different makers may not fit or keep their certification.
Many engineers ask how to install cable gland parts the same way on every job. That is understandable. However, the cable type, enclosure, and zone change the method. Therefore, treat the steps below as a base, then adapt them to your cable and site.
How to Install Cable Gland: Step-by-Step Process
This section shows how to install cable gland hardware on a standard compression type. The same sequence applies to most brass, stainless steel, and nylon glands. Always follow the manufacturer’s data sheet where it differs. If you are new to this task, here is how to install cable gland fittings safely.
Step 1: Isolate Power and Confirm the Match
First, isolate and lock out the circuit according to your site procedure. Next, compare the cable diameter with the gland’s size range. If the cable falls outside that range, choose another gland size. Never force a cable into a gland that is too small.
Step 2: Prepare the Enclosure Entry
Check that the entry hole is clean, deburred, and the right size. Besides that, confirm the thread is undamaged. For a clearance hole, you will need a locknut on the inside. For a tapped hole, screw the gland body in directly.
Step 3: Disassemble the Gland
Unscrew the compression nut and remove the seal from the body. Then lay the parts out in the order they will go on the cable. As a result, you will not mix up the seal, washer, and nut during assembly.
Step 4: Strip the Cable to the Right Length
Next, strip the outer sheath carefully. Measure the length you need from the terminal position to the gland entry, plus the termination length. Cut cleanly and avoid nicking the inner cores. In addition, wipe the sheath so the seal grips a clean surface.
Step 5: Slide the Parts onto the Cable
Pass the compression nut, then the seal, then the gland body over the cable. Keep the order correct, because this order is central to how to install cable gland sets without leaks. For armoured cable, add the armour cone and clamping ring in the sequence the data sheet shows. Meanwhile, keep the cores straight and free of strain.
Step 6: Fit the Gland Body to the Enclosure
Screw the gland body into the entry or pass it through the hole. Then fit the sealing washer and tighten the locknut with a spanner. Hold the body steady with the second spanner. Consequently, the body will not twist the cable as you tighten.
Step 7: Tighten the Compression Nut
Push the cable into position, then hand-tighten the compression nut. Next, use a spanner to tighten it until the seal grips the sheath firmly. Stop when the seal squeezes evenly around the cable. However, do not over-tighten, because excess force damages the sheath and reduces the seal’s life.
Step 8: Terminate, Earth, and Close Up
Connect the cores to their terminals. If the cable is armoured, connect the earth tag or bonding as designed. Finally, close the enclosure and fit blanking plugs to every unused entry. Otherwise, the enclosure keeps a weak point. That completes how to install cable gland hardware on a standard compression type.
How to Install Cable Gland on Armoured Cable
This method needs one extra job: it must clamp the armour. This clamp provides mechanical hold and a reliable earth path. Therefore, the armour preparation decides the quality of the installation.
Strip the outer sheath to expose the armour wires. Next, spread the wires evenly around the gland cone. Then fit the clamping ring so the wires sit between the cone and the ring. Tighten the clamp nut until the armour holds firmly. Afterward, trim any loose wire ends so they cannot pierce the seal.
Gland style also matters. For example, BW armoured cable glands suit indoor use where the outer sheath seal is not needed. By contrast, CW cable glands add an outer sheath seal, which makes them suitable for outdoor use. Choose the style that matches the environment before you start.
How to Install Cable Gland Types for Hazardous Areas (Ex d)
A flameproof gland protects an enclosure that sits in an explosive atmosphere. Because of this, the installation rules are stricter. Only trained and competent people should carry out the work. This is how to install cable gland units without risking the certification.
Follow these key rules:
- Use only a gland certified for the zone, gas group, and enclosure.
- Read the certificate and its conditions of use before installation.
- Engage the full thread length the certificate requires.
- Use only sealing compounds the certificate permits.
- Never modify the gland or drill the body.
In Europe and the UK, the HSE explains the ATEX requirements for equipment in explosive atmospheres. For global projects, the IECEx System publishes certified equipment and service facility data. In addition, the IEC 60079-14 code of practice covers electrical installation design, selection, and erection in explosive atmospheres. To see the certified range, review our flameproof cable glands.
Which Cable Gland Type Fits Your Installation?
Choosing the right type before you start saves rework, because how to install cable gland products depends on their design. The table below compares the three most common options. Use it as a quick guide, then confirm against the cable data sheet.
| Feature | Single Compression Gland | Double Compression Gland | Flameproof (Ex d) Gland |
| Best for | Unarmoured cable, general indoor use | Armoured cable, industrial and outdoor use | Explosive atmospheres |
| Seals on | Outer sheath | Outer sheath and armour clamp | Per certificate design |
| Installation effort | Low | Medium | High, certificate-driven |
| Earth path for armour | No | Yes | Yes, where armoured |
| Certification needed | Standard markings | Standard markings | ATEX or IECEx certificate |
Source: Cabex India installation practice, with reference to IEC 60079 and IEC 60529 requirements.
As the table shows, installation effort rises with protection needs. Therefore, match the gland to the real site conditions, not just the cable size.
Common Mistakes When You Install a Cable Gland
Most failures come from a handful of repeat errors. Even experienced fitters who know how to install cable gland parts make them. Fortunately, each one is easy to prevent.
- Wrong size: A gland outside the cable range will not seal.
- Over-tightening: Too much force crushes the sheath and splits the seal.
- Under-tightening: A loose nut lets water and dust in.
- Missing washer or locknut: The enclosure loses its seal and the gland can loosen.
- Mixed threads: Forcing metric into NPT or PG damages both parts.
- Poor armour clamp: A weak clamp breaks the earth path.
- Open spare entries: Unused holes defeat the enclosure rating.
For spare entries, use proper blanking plugs and thread adaptors rather than improvised covers. In addition, replace any seal that shows cracks or deformation.
How to Test and Inspect a Cable Gland After Installation
Always inspect the work before you energise the circuit. Testing is the last stage of how to install cable gland products properly. First, check the cable sits straight and the seal looks evenly compressed. Then give the cable a gentle pull to confirm it does not move.
Next, test the earth continuity on armoured cables. After that, run an insulation resistance test where your procedure requires it. Finally, record the gland type, size, and test results in your installation file.
Before energising, follow your site’s lockout and tagout process. OSHA’s electrical safety resources outline general safe work practices for electrical work. In hazardous areas, also check that the certificate records match the installed glands.
Frequently Asked Questions
How to install cable gland on armoured cable?
Strip the sheath and spread the armour around the cone. Then fit the clamping ring and tighten the nut until the armour holds firmly.
How tight should a cable gland be?
Tighten until the seal grips the sheath evenly and the cable resists a hand pull. However, stop before the sheath deforms.
Do you need sealant on a cable gland thread?
Use sealant only where the manufacturer allows it, and never on flameproof threads unless the certificate permits it.
Can you reuse a cable gland?
You can reuse a gland if the seal and thread are undamaged, but replace any worn or cracked seal first.
What size cable gland do I need?
Pick the gland whose sealing range covers your cable’s outer diameter, and check that the thread matches the enclosure entry.
Need Certified Cable Glands for Your Project?
Correct installation starts with the right product, and knowing how to install cable gland fittings comes second. Cabex India manufactures industrial and hazardous-area cable glands for export markets. Our technical team can help you match gland size, material, and certification to your cable and site. Contact Cabex India to request a quote or technical support.
Conclusion
Learning how to install cable gland hardware well protects people, cables, and equipment. It also keeps the enclosure rating intact. First, match the gland to the cable and thread. Next, prepare the cable and enclosure entry carefully. Then tighten in the correct order, terminate, and test.
For armoured and flameproof glands, follow the extra steps and the certificate conditions. Above all, never skip the final inspection. With the right gland and a careful process, your installation will stay sealed, secure, and compliant for years.
