What is best important issue or feature of consuraction or production for CR1&C1 cable?

CR1  is  fire resistant  NF C 32070-2.3(CR1)
C1 is flame retardant  NF C 32070-2.2 (C1)

different test methods ,  you can not categorize both of them,  you can lookYou are not allowed to view links. Register or Login

The NFC 323070  standard defines a test allowing the fire-resistance assessment of cables at rated voltage (500V). 1.5m of a cable is placed in a stainless-steel tube and placed in a tubular oven. This furnace heats the cable following the ISO834  time- temperature curve, and mechanical shocks are applied on the tube each 30 seconds. Under these conditions, the cable will maintain its electrical continuity for at least 65 min. Four to five tests will be satisfactory to attest cable conformity.

This performance was challenged by the French safety authorities, arguing that standard cables installed in 1 hour fire-resistant  protective systems were much reliable, robust and safe.

Indeed, protective systems using standard cables strongly compete in terms of safety with electrical installations based on fire-resistant cables  only. A test initiative was implemented via the Sycabel (French cable association) and technically led by Nexans Research Center-Lyon. The strategy was to quantify the fire-resistant potential of CR1 cables installed on a fire-resistant tray when tested in a large oven simulating a real fire. The objective was to determine whether the electrical integrity was ensured for at least 1 hour. This kind of mounting has the advantage of being less expensive,  less cumbersome, and easier to install in comparison with protective systems.

The final  results widely surpassed our  wishes,  as all  20  samples  fulfilled  the requirements (electrical integrity higher than 60 min) with a life-time average of 85 min. This conclusion was presented to the French authorities and validated as at least equivalent to standard cable installed in fire-resistant protective systems

source from nexans

Thanks for information.

Sure, let's dive deeper into the specifics of CR1&C1 cables:

### **1. Fire Resistance and Circuit Integrity**
CR1&C1 cables are designed to maintain their functionality during a fire. This is achieved through:
- **Fire-resistant insulation**: Typically made from materials like mica tape or silicone rubber, which can withstand high temperatures.
- **Testing standards**: These cables are tested under conditions that simulate real fire scenarios to ensure they can maintain circuit integrity for a specified duration (e.g., 30, 60, or 90 minutes).

### **2. Low Smoke Zero Halogen (LSZH)**
- **Material composition**: The outer sheath of these cables is made from LSZH materials, which emit very low levels of smoke and no halogen gases when burned. This is crucial for maintaining air quality and visibility during a fire, reducing the risk of toxic exposure.
- **Safety benefits**: LSZH cables are particularly important in enclosed spaces like tunnels, high-rise buildings, and public transport systems where evacuation routes need to remain clear and safe.

### **3. Durability and Mechanical Strength**
- **Conductor material**: High-quality copper conductors (solid or stranded) are used for their excellent electrical conductivity and mechanical strength.
- **Insulation and sheathing**: The insulation and sheathing materials are chosen for their resistance to mechanical damage, moisture, and chemicals, ensuring long-term reliability even in harsh environments.

### **4. Compliance with International Standards**
CR1&C1 cables adhere to stringent international standards, such as:
- **NF C 32-310**: This standard specifies the requirements for fire-resistant cables used in electrical installations.
- **NF C 32-070**: This standard covers the performance of cables under fire conditions, including flame propagation and smoke emission.

### **5. Applications**
These cables are used in critical applications where maintaining power and control during a fire is essential, such as:
- **Emergency lighting systems**
- **Fire alarm and detection systems**
- **Public address and voice alarm systems**
- **Smoke extraction and ventilation systems**

### **6. Installation Considerations**
- **Routing and protection**: Proper installation practices, including the use of fire-resistant supports and conduits, are essential to ensure the cables perform as expected during a fire.
- **Regular maintenance**: Periodic inspections and maintenance are necessary to ensure the integrity of the cables over time.

If you have a specific project or application in mind, feel free to share more details, and I can provide tailored advice or additional information! 😊