3. What is MICC cable (also known as pyro cable) used for?
Our Twisted Conductor Cable range offers reduced electromagnetic interference and signal corruption and are widely used in data centres as well as other applications such as fire alarm telephone systems, CCTV and public address systems.
6. What are the advantages of MICC cable (also known as pyro cable)?
- Exceptional fire survival properties: MICC is made from just two, non-combustible materials; copper and magnesium oxide. Both these materials can withstand extreme heat (see Question 7 below for more detail).
- Durability and longevity: With a lifespan of over 50 years, MICC cable reduces the need for replacements, lowering long-term costs and waste.
- Waterproof and rodent-proof: The copper sheath makes MICC cable waterproof and resistant to rodents.
- Non-toxic: MICC is made from just two materials, copper and magnesium oxide, neither of which release harmful gases or pollutants during a fire.
- Environmental credentials: MICC is made entirely from recyclable, non-toxic materials (copper and magnesium oxide), which makes it a more eco-friendly option than cables with plastic insulation.
7. MICC cable vs. alternative fire performance cables
- MICC cable: Uses a copper sheath and magnesium oxide insulation, which are non-combustible and can withstand extreme heat. Copper melts at 1,085°C, and magnesium oxide at 2,852°C. MICC cables release no toxic fumes during a fire and are made from recyclable materials.
- Soft skin / fire resistant cables: Are often made with plastic or polymer insulation, these cables can degrade under extreme heat, releasing toxic fumes. These materials are also difficult to recycle.
8. MICC cable vs. Steel Wire Armour (SWA) cable: Which is better?
The benefit of MICC cables is that due to their unique construction the overall diameter of the cable is far smaller than that of an SWA cable. MICC cable can also perform at higher temperatures than the SWA alternative.
SWA cables also rely on different plastics and polymers to aid their fire protection capabilities, and these can deteriorate over time. In contrast, MICC cables are a non-ageing product that do not need plastics, polymers resins or tapes to provide fire protection, this is provided by the copper sheath with a melting point of 1,085°C and magnesium oxide insulation with a melting point of 2,852°C. These materials also make MICC cable 100% recyclable.
9. How do you terminate MICC cable (also known as pyro cable)?
You can watch our video for a demonstration: How to Terminate Light Duty MICC Cable
10. Where can I buy MICC cable?
Either in-store at any branch or through CEF’s online store. Visit Find a Supplier for more details.
11. Where can I buy MICC cable accessories?
Both in-store and online.
12. What is the difference between flame retardant and fire-resistant cables?
Flame-retardant cables are primarily about limiting fire spread, often through materials that self-extinguish. They do not guarantee operation during a fire.
Fire-resistant cables aim to survive fire conditions while maintaining electrical circuit function, for a defined period.
Within the fire-resistant category:
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- Polymeric options provide some protection but may fail under true fire conditions and create toxic smoke.
- MICC cables stand out as true fire-survival cables—robust, durable, non-combustible, and trusted globally for critical safety systems.
13. What testing scenarios are used to classify a cable as ‘Fire Survival’?
For any cable to be classed as ‘Fire Survival’ it should undergo TRUE fire scenario testing involving fire, water and DIRECT impact on one single sample of cable. Wrexham Mineral Cable’s MICC does just that.
In order to satisfy one of the most globally recognised standards, London Underground devised a test for fire survival cables. The aim of the test was to extend the conditions of BS 6387 to effectively recreate a more realistic fire scenario, demonstrating what the cables maybe be subjected to in the event of a fire. This involves thermal shock and DIRECT impact on the cable sample. In a true fire scenario, cables have to survive not only the extremes of high temperatures, but also the impact from falling debris together with water and foam exposure. In the resulting aftermath of a fir, a cable may be required to withstand bending, impact and water immersion whilst remaining operational.
15. Is it possible to retrofit MICC and what are the benefits?
A key benefit of MICC is adaptability. MICC can be bent, formed, or dressed directly onto surfaces, following existing routes without the need for additional containment. MICC also requires minimal maintenance – once installed, MICC requires no special fire sealing or insulation testing regimes typical of polymeric alternatives. MICC also offers extended lifespan. Its non-ageing, corrosion-resistant materials provide a near-permanent wiring solution, ideal for refurbishments where long-term reliability reduces total ownership cost.
