Ensuring Cable Safety: Fire-Resistant vs Fire-Retardant Cables Explained

Fire safety is one of the most critical indicators in power system construction. In actual engineering design and on-site procurement, many professionals often confuse flame-retardant cables with fire-resistant cables, leading to incorrect model selection, numerous hidden dangers, and even project failure.

This article comprehensively explains the core definitions, structural differences, construction standards, performance parameters, and applicable scenarios of flame-retardant and fire-resistant cables, covering low-voltage 0.6/1kV and medium-voltage 6kV-35kV specifications. Combining practical engineering cases and standardized selection recommendations, it helps industry professionals efficiently and accurately match cables.

Flame-retardant materials are added to the insulation and sheath. When exposed to an open flame, they inhibit the spread of flame and self-extinguish after the source of fire is removed. Their core function is to limit the spread of fire and prevent large-scale spread along the cable line, but they cannot maintain normal power supply under continuous combustion.

Utilize a special mica tape fire-resistant winding structure. Under specified flame temperatures and burning times, they maintain the integrity of the circuit structure and continue to provide normal power supply. Their core value lies in ensuring emergency power supply to fire-fighting equipment, evacuation systems, and critical loads during a fire, buying valuable time for rescue and escape.

• Flame-retardant Standards: IEC 60332-1, IEC 60332-3, GB/T 19666
• Fire-resistant Standards: IEC 60331, GB/T 19666
• Low-smoke Halogen-free Standards: IEC 60754 series

• Flame Retardant Rating: ZA (highest) > ZB > ZC, different grades correspond to different flame retardant levels.
• Fire Resistance Rating: Class A is the mainstream application, capable of stable operation for 90 minutes under high-temperature flames of 750℃-950℃.

• Low Voltage: Building daily power supply, lighting circuits, general distribution box wiring, general power circuits in factories
• Medium Voltage: Main power distribution lines in general industrial parks, power pipelines on municipal roads, main lines of substations in non-critical areas
• Public power lines in public areas, fire-resistant isolation lines densely laid in cable trenches

• Low Voltage: Smoke exhaust fans, fire alarm systems, emergency lighting, dedicated power lines for fire pumps
• Medium Voltage: Main power supply for high-risk workshops in petrochemical plants, emergency power supply for hospitals, key transmission lines in tunnels and underground utility tunnels
• Data center backup power circuits, medium-voltage lifeline circuits in subways and large commercial complexes

Project Requirements: Numerous low-voltage power distribution lines; fire prevention and cost control are crucial. Selected Product: 0.6/1kV ZC-grade flame-retardant YJV cable. Application Effect: Effectively prevented the spread of localized fires, met daily power supply safety standards, and reasonably controlled overall project procurement costs.

Project Requirements: The park stores flammable materials; core production equipment needs to maintain power supply in the event of a fire. Selected Product: 8.7/15kV NH-YJV22 armored fire-resistant medium-voltage cable. Application Effect: Maintained stable power supply even under localized open flame conditions, preventing sudden equipment shutdowns and fully meeting the high fire safety standards of the chemical industry.

Project Requirements: Enclosed space with dense cable distribution; low-smoke, non-toxic cables are required, while ensuring fire safety. Selected Product: 0.6/1kV & 10kV WDZN low-smoke halogen-free fire-resistant cable. Application effect: It releases almost no toxic fumes and harmful gases during combustion, ensuring the safety of personnel evacuation and fire rescue in the tunnel.

• Flame-retardant cables should be prioritized for daily power distribution lines, balancing safety and cost.
• All fire-fighting dedicated lines and emergency evacuation lines must use fire-resistant cables; substitution with flame-retardant cables is strictly prohibited.
• Low-smoke halogen-free fire-resistant cables should be prioritized for enclosed spaces such as tunnels, utility tunnels, and underground garages.
• Armored flame-retardant or fire-resistant cables should be selected for buried, roadside, and high-voltage installation environments.
• Medium-voltage key power supply lines must use Class A fire-resistant cables to match the system load level.
• Voltage levels should be clearly distinguished: 0.6/1kV should be used for terminal distribution lines, and 6-35kV should be used for main transmission lines.

Flame-retardant cables focus on preventing the spread of fire, while fire-resistant cables focus on maintaining emergency power supply. In power engineering construction, a reasonable selection should be made based on the project's fire risk level, building characteristics, and the importance of power supply. Standardized selection of low-voltage and medium-voltage fire-resistant cables can not only effectively reduce fire hazards but also comply with international electrical safety standards and reduce subsequent operation and maintenance risks.

Jinhong Cable provides a full range of 0.6/1kV low-voltage and 6kV-35kV medium-voltage flame-retardant and fire-resistant cables. All products have passed IEC and GB authoritative certifications, have stable fire resistance performance, and are available in a complete range of models to meet the power supply needs of municipal engineering, industrial buildings, commercial buildings, and infrastructure worldwide.