Many industrial facilities can upgrade fire safety and minimize corrosion hazards in existing facilities without a complete rebuild by retrofitting them with halogen-free cables. The older PVC based systems are effective when they are operating normal but have the ability to put out a heavy toxic smoke and corrosive gas in the event of a fire, which can harm personnel, electronics, and production. This guide offers hands-on, practical, and real-world information on planning, phasing, and steering clear of issues, to ensure your retrofit provides tangible safety benefits at minimal disruption.
Why Existing Plants Are Considering Halogen-Free Retrofits
Conventional PVC cables are suitable for general purpose applications and are inherently flame resistant. They do cause heavy black smoke and halogen acids, however, when exposed to fire and will corrode sensitive equipment and make evacuation difficult. Halogen-free (LSZH) cables are suitable for use in plants that have critical control systems or high occupancy areas, as they are made with advanced polymer compounds that significantly reduce the smoke density, toxicity and corrosive emissions.
These upgrades are accelerated by external pressures. Increased building codes, insurance demands, customer audits, and corporate ESG objectives are increasingly driving low-smoke, zero-halogen solutions. The enhanced safety profile is best suited for facilities with confined areas, MCCs, data centers or enclosed process lines.
Planning a Halogen-Free Cable Retrofit – Where to Start
Retrofits are successful when they start with structured assessment instead of replacement.
Map Risk Zones and Cable Density
First, a risk and inventory map should be made. Start with confined areas, control rooms, data centers, tunnels, sublevel corridors and high occupancy areas. Determine regions where cables are present in large quantities, the loss of which would affect main production controls or safety circuits.
Define Retrofit Objectives and Scope
Set clear objectives right from the start: specific improvement in most vulnerable areas, gradually replacing the plant over time, or achieving conformity with IEC 60754 (halogen acid gas), IEC 61034 (smoke density), IEC 60332 (flame propagation) or EN/CPR classes. Fit the scope within budget, downtime and regulatory priorities.
Engage Stakeholders Early
Get EHS, maintenance, operations, finance, procurement, OEMs and integrators onboard from the start. Make sense of the situation in the early workshops and minimize later resistance.
Phasing the Retrofit to Minimize Production Disruption
Phased approach is preferred over big bang replacement in most brownfield scenarios.
Prioritize High-Risk, High-Value Areas
Start Phase 1 in high-risk areas, like control rooms, enclosed MCCs and critical process panels. In subsequent phases extend to other production areas where smoke or corrosion hazards are present. It’s not always a must to change an open cable tray.
Align Retrofits with Planned Outages
Replace during maintenance shutdowns, line upgrade or building-by-building rollout. The whole operations keep on going, panel-wise or line-wise execution.
Prototype and Pilot Before Scaling
Test the pilot in a single representative region (e.g., one control room, production line). Test mechanical handling, terminations, EMC performance and installation practices. Use results to update specifications prior to full rollout.
Common Technical and Organisational Pitfalls in Halogen-Free Retrofits
There are many projects that face unnecessary problems, which add to cost or delay benefits.
Treating LSZH as a Drop-In PVC Replacement
LSZH compounds can typically exhibit different stiffness, bending and dielectric characteristics compared with PVC. If box-to-box switching is done without routing, bend radii and load sizing are taken for granted, installation difficulties or performance deficiencies may occur.
Ignoring Mechanical and Installation Limits
If LSZH jackets are bent too deeply or pulled, cracks can occur. Installers who are used to PVC often use the same tight radius and force when installing it in a retro job, causing damage in the process.
Incomplete Fire-Performance and Compliance Specifications
General requests for “low smoke cable” without specific IEC or CPR standards may lead to products not meeting the expected standards during audits and accidents.
Underestimating Procurement and Lead Time Challenges
Halogen-free cables will normally have much higher minimum order quantities, longer lead times and higher costs. This is often a challenge that slows down projects for poor planning.
Poor Documentation and Training
Skipping of the updates of the cable schedule, drawing, and procedure, or forgetting to train on LSZH cable handling procedures, causes errors which could have been avoided in future maintenance.
Practical Recommendations for Successful Plant-Wide Upgrades
- Begin by creating a risk based map that identifies those confined spaces and critical equipment rooms where failure modes for the various types of cable that contain halogens are most likely to create risks.
- State clearly the performance requirements of LSZH in terms of specific smoke, halogen acid gas and flame spread testing.
- Verify mechanical handling, EMC and installation practices through prototypes and pilots prior to rollout.
- Phase retrofits are planned around planned outages to balance out safety improvements with maintaining production continuity and to prioritize high risk areas.
- Train installation and maintenance crews in bending, pulling, terminations and identification of LSZH.
- Realistically schedule procurements and budgets with the premium as an investment in safety, equipment protection and downtime reduction.
- Review plant standards and register new projects to ensure compliance with the new halogen-free approach.
The installation of halogen-free cables in older plants is a wise investment for safety and long-term reliability. By carefully planning the project, phasing the work and focusing on realistic considerations, facilities can make a real difference in reducing the risk of work without causing any disruption.
As a manufacturer of custom halogen-free industrial cable, we are able to provide our solutions for the complex industrial plants’ automation and retrofit projects. We understand the material properties, certifications and practical application engineering and are able to help teams specify the solutions that will perform in their environment. Provide your plant information and we’ll help design a customized retrofit plan.
