Installing an Ex-d cable gland correctly is not just a technical requirement — it is a critical safety obligation. In hazardous locations where flammable gases, vapours, or dust are present, a single improper installation can compromise the entire explosion-proof integrity of your electrical enclosure.
This comprehensive guide walks you through how to install Ex-d cable gland safely and correctly, covering tools required, pre-installation checks, torque specifications, compliance standards, and post-installation testing. Whether you are a certified electrician, a plant maintenance engineer, or an EPC contractor, this guide gives you everything you need to execute a compliant and reliable installation.
At Cabex India, we manufacture high-quality Ex-d cable glands that comply with IECEx, ATEX, and IS/IEC 60079 standards — built for performance in the harshest industrial environments.
What Is an Ex-d Cable Gland and Why Does Correct Installation Matter?
An Ex-d cable gland (also called a flameproof cable gland) is a certified cable entry device designed for use with flameproof (Ex d) enclosures — the “d” standing for flameproof enclosure as per IEC 60079-1. It ensures that any internal ignition cannot propagate outside the enclosure by providing a tight, sealed, and mechanically robust cable termination.
Incorrect installation of an Ex-d cable gland can:
- Breach the Ex d integrity of the enclosure
- Allow external flammable atmosphere to enter the enclosure
- Fail third-party audits and PESO/ATEX inspections
- Void the equipment’s Ex certification
- Create life-threatening explosion hazards
That is why understanding how to install Ex-d cable gland is a non-negotiable skill in hazardous area electrical work.
Types of Ex-d Cable Glands — Quick Reference
Before installation, confirm you have the right type of Ex-d cable gland for your cable and application.
| Gland Type | Cable Type | Typical Application |
| Single Compression (A1/A2) | Unarmoured cables | Light-duty process environments |
| Double Compression (E1W/E2W) | Unarmoured, with IP66/68 seal | Outdoor & wet environments |
| Armoured Single Compression | SWA / SWAB armoured cables | Medium industrial installations |
| Armoured Double Compression | SWA armoured, high IP | Offshore, petrochemical, heavy industry |
| Ex-d Barrier Gland | Armoured cables with inner seal | Flameproof enclosures (Ex d zone) |
Pro Tip from Cabex India: Always match the cable gland selection to the cable outer diameter (OD) range specified in the gland’s datasheet. An undersized or oversized gland will fail compression sealing.
Standards and Certifications Governing Ex-d Cable Gland Installation
Any installation of flameproof cable glands must comply with applicable national and international standards. The table below summarises the key standards relevant to Indian and global markets.
| Standard | Scope |
| IEC 60079-0 | General requirements for explosive atmospheres |
| IEC 60079-1 | Specific requirements for flameproof enclosures (Ex d) |
| IEC 60079-14 | Electrical installation design, selection & erection |
| IS 5571 | Indian standard for equipment used in explosive atmospheres |
| ATEX Directive 2014/34/EU | European conformity for Ex equipment |
| IECEx System | International certification for Ex equipment |
Cabex India’s Ex-d cable glands are tested and certified under IECEx and comply with IS/IEC 60079 series, making them suitable for both Indian market installations (PESO-approved plants) and export to global projects.
Tools and Materials Required for Ex-d Cable Gland Installation
Gathering the right tools before you begin is critical for a compliant installation of an Ex-d cable gland.
Tools Required:
- Appropriate size open-end or torque wrench (calibrated)
- Cable prep tool / cable knife
- Vernier caliper (for cable OD measurement)
- Wire brush (for cleaning enclosure threads)
- Thread sealant or anti-corrosion compound (manufacturer-approved)
- PPE: insulated gloves, safety glasses, non-sparking tools (in live hazardous zones)
Materials Required:
- Certified Ex-d cable gland (Cabex India recommended)
- Lock nut (if required by enclosure design)
- Sealing washer / O-ring (supplied with gland or specified by manufacturer)
- Cable (pre-verified for OD compatibility)
- Thread tape (PTFE) — only where permitted by manufacturer’s instructions
How to Install Ex-d Cable Gland: Step-by-Step Process
Follow these steps carefully to ensure a fully compliant Ex-d cable gland installation. Do not skip or reorder any step — the sequence is designed to preserve the Ex d integrity of the assembly.
Step 1 — Verify Hazardous Area Classification and Gland Selection
Before touching any component, confirm:
- The Zone classification (Zone 1 or Zone 2 for gas/vapour; Zone 21 or 22 for dust)
- The Equipment Group (Group I for mines, Group II for surface industries — IIA, IIB, IIC)
- The Temperature Class of both the cable gland and the enclosure (T1–T6)
- The cable gland’s Ex marking — e.g., Ex d IIB T6 Gb — matches the enclosure’s Ex marking
Do not proceed if the gland certification does not match the enclosure. A mismatch invalidates the entire Ex d assembly.
Step 2 — Inspect the Ex-d Cable Gland Before Installation
Visually inspect every component of the gland before installation:
- No cracks, nicks, or damage to the body, entry thread, or compression nut
- Elastomeric seals (O-rings, compression rings) are undamaged and of the correct material for the cable type
- Entry threads are clean and undamaged — check with thread gauge if in doubt
- All components belong to the same certified assembly (do not mix components from different gland families or manufacturers)
Discard any gland with visible damage. Never repair or modify a certified Ex-d cable gland in the field.
Step 3 — Prepare the Cable
Correct cable preparation is one of the most critical steps in how to install an Ex-d cable gland.
For armoured cables:
- Measure and strip the outer sheath to the length specified in the gland’s installation instructions (typically 40–80 mm beyond the armour clamp position)
- Cut armour wires cleanly at 90° using armour cutters — no jagged edges
- Fan the armour wires back over the clamping cone
- Strip inner sheath and insulation as required for termination
- Measure cable OD — confirm it falls within the gland’s rated OD range
For unarmoured cables:
- Strip outer sheath to required length
- Clean sheath surface — remove grease or release agent from cable manufacturing
- Measure OD at the sealing zone — it must be within gland specification
Cabex India Tip: A cable OD even 0.5 mm outside the stated range can result in incomplete sealing. Always verify with a vernier caliper, not by visual estimation.
Step 4 — Disassemble the Ex-d Cable Gland
Before threading the cable through the gland, fully disassemble it in the correct order. Most Ex-d cable glands consist of:
- Entry body (threaded for enclosure)
- Armour clamp / inner seal assembly
- Compression nut
- Outer seal / back nut
Keep all components together and oriented correctly — label or photograph the sequence if needed.
Step 5 — Thread Cable Through Gland Components
Thread the prepared cable through the gland components in the correct order (back to front, as per manufacturer instructions):
- Back nut / outer compression nut
- Outer seal ring
- Armour clamp cone (for armoured glands)
- Inner seal / body entry assembly
Ensure the cable is positioned so that the armour clamp engages the armour wires correctly when tightened.
Step 6 — Install the Ex-d Cable Gland into the Enclosure
Enclosure thread preparation:
- Clean the threaded entry of the enclosure with a wire brush
- Remove any paint, debris, or corrosion from the thread form
- Apply a thin layer of anti-seize compound or manufacturer-approved thread sealant — never PTFE tape on NPT or ISO threads for Ex d applications unless explicitly permitted
- Verify thread type and engagement length — for Ex d compliance, a minimum full thread engagement is mandatory per IEC 60079-1
Install the gland body:
- Hand-tighten the gland body into the enclosure entry
- Use a calibrated torque wrench to tighten to the manufacturer’s specified torque value
- Confirm the gland body is seated flush against the enclosure wall or sealing washer (if applicable)
Torque Reference Guide:
| Gland Thread Size | Typical Torque Range (Nm) |
| M20 | 10 – 15 Nm |
| M25 | 15 – 20 Nm |
| M32 | 20 – 28 Nm |
| M40 | 28 – 38 Nm |
| M50 | 38 – 50 Nm |
Note: Always refer to the specific torque values in Cabex India’s installation datasheet for your gland model. Values above are indicative only.
Step 7 — Compress the Outer Seal (Ingress Protection)
With the gland body secured in the enclosure:
- Pull the cable to its final installed position
- Hand-tighten the outer compression nut / back nut to bring the outer seal into contact with the cable sheath
- Use a torque wrench or spanner to tighten to the manufacturer’s specified torque — the outer seal must compress uniformly around the cable OD
- Verify the cable cannot be pulled or rotated by hand — this confirms correct seal engagement
This step delivers the IP66/IP68 ingress protection rating of the gland.
Step 8 — Clamp the Armour (For Armoured Cable Glands)
For armoured cable types:
- Fan the armour wires evenly over the inner cone
- Slide the armour clamp nut forward to engage the cone
- Tighten to specified torque — the armour wires must be firmly gripped around the full circumference
- Perform a manual pull test — armour should not slip under moderate pulling force
This step also provides the earth continuity path from armour to enclosure body via the gland — critical for fault protection in hazardous areas.
Step 9 — Perform Post-Installation Checks
Before energising the circuit, conduct the following verification checks:
| Check | Method | Pass Criteria |
| Visual inspection | Naked eye / magnifier | No damage, correct assembly, no missing components |
| Cable OD sealing | Pull & rotate test | Cable immovable by hand |
| Thread engagement | Visual / depth gauge | Full engagement per IEC 60079-1 |
| Armour continuity | Continuity meter | <1 Ω armour-to-enclosure |
| IP integrity | Pressure test (where required) | Per IP66/68 test protocol |
| Torque verification | Torque wrench | Within specified range |
| Marking check | Visual | Gland Ex marking visible & legible |
Document all checks in your installation record for compliance audit purposes.
Common Installation Mistakes to Avoid
Even experienced engineers make errors. Here are the most common mistakes when installing an Ex-d cable gland — and how to avoid them.
- Wrong gland for cable OD — Always measure cable OD before selection, not after
- Insufficient thread engagement — Count full thread turns; partial engagement compromises Ex d integrity
- Over-torquing compression nut — Splits the elastomeric seal; use calibrated torque wrench
- Mixing gland components — Never combine parts from different gland families; each certified assembly is specific
- Ignoring cable movement — Secure cables with cable cleats within 300 mm of the gland to prevent vibration stress
- No anti-corrosion treatment on stainless or brass glands — Apply approved compound, especially in offshore or high-humidity environments
- Painting over Ex markings — Markings must remain legible post-installation per IEC 60079-14
Why Choose Cabex India for Ex-d Cable Glands?
Cabex India is one of India’s leading manufacturers of industrial cable glands, cable lugs, and cable management accessories. Our Ex-d cable glands are:
- Certified: IECEx and IS/IEC 60079 compliant
- Precision machined: CNC-manufactured from brass, stainless steel 316, and nickel-plated brass
- Wide range: Available from M16 to M75 and NPT/BSP thread forms
- Industry proven: Installed in oil & gas, petrochemical, power, pharmaceutical, and mining plants across India and internationally
- Fully traceable: Batch-coded with certificates available for every shipment
Explore our complete range of Ex-d cable glands at cabexindia.com or contact our technical team for application-specific selection support.
Conclusion
Knowing how to install Ex-d cable gland correctly is a safety-critical competency for anyone working in or around hazardous areas. From correct gland selection and cable preparation to precise torque application and post-installation testing — every step in this guide exists to protect personnel, equipment, and your facility from the risk of explosion.
Always work to IEC 60079-14 and manufacturer installation instructions. Document every installation. Use only certified, quality-manufactured glands — because in an explosive atmosphere, there is no room for compromise.
For certified Ex-d cable glands that are engineered for reliability and built to the highest safety standards, trust Cabex India — your partner in hazardous area cable management solutions.
Frequently Asked Questions (FAQs)
Q1. What does Ex-d mean in a cable gland?
Ans. “Ex-d” denotes a flameproof type of protection where the gland and enclosure contain any internal ignition without propagating it to the external atmosphere.
Q2. Can I use a standard cable gland in an Ex-d zone?
Ans. No — only certified Ex-d (flameproof) cable glands must be used in flameproof enclosures in Zone 1 or Zone 2 hazardous areas.
Q3. How many thread turns are required for an Ex-d cable gland installation?
Ans. IEC 60079-1 requires a minimum of five full thread turns of engagement between the gland and the enclosure entry for Ex d compliance.
Q4. What is the difference between single and double compression Ex-d cable glands?
Ans. Single compression glands provide one seal point (cable sheath); double compression glands add a second independent seal, delivering higher IP ratings and better cable retention.
Q5. Do I need a separate earth tag with an Ex-d cable gland?
Ans. For armoured cables, the armour clamp in the gland provides the earth continuity path; for unarmoured cables in some designs, a separate earth tag may be specified — always check the gland’s installation instructions.
