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NHRYMC Fire-Resistant Compact Busbar System(400-2500A)

Engineered as a specialized renyun busway system for fire emergency power supply, this solution is rigorously tested to maintain uninterrupted operation for over 180 minutes at temperatures exceeding 950°C—surpassing industry fire safety standards (e.g., IEC 60709) for critical power resilience during emergencies. Unlike conventional busbars, this design prioritizes life safety and infrastructure protection in high-risk environments, making it the gold standard for fire-rated power distribution.

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    Structural Fireproofing Architecture

    The dual-layer housing system combines robustness and thermal insulation:

    Outer Shell

    Constructed from high-quality carbon structural steel, the outer layer provides impact resistance (with a yield strength of 235MPa) and protects against mechanical damage, while the inner steel layer offers additional corrosion resistance. The double-layer design creates a reinforced barrier against fire penetration.

    30mm Aluminum Silicate Fireproof Insulation

    Sandwiched between the steel layers, this high-density insulation (thermal conductivity <0.04W/m·K) forms a thermal break, reducing heat transfer to internal components by up to 92%. Independent tests show that after 3 hours at over 950°C, the internal temperature rise remains below 60K—ensuring safe conductor operation.

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    Surface and Internal Fire Protection

    Specialized Red Sand-Grain Fire Retardant Coating
    6-Layer Refractory Mica Tape Insulation
    The exterior features a proprietary intumescent coating that swells to form a 5mm insulating char layer at 300°C, blocking heat and flames. Certified to UL 94 V-0 standards, this coating also resists chipping and fading, maintaining visual integrity in harsh environments.
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    Each copper busbar is fully wrapped with high-purity muscovite mica tape (thermal stability up to 1300°C), with six overlapping layers between phases to eliminate thermal bridging. This multi-layer system achieves a fire resistance rating of ASTM E119-18 (Type A, 3-hour rating), far exceeding typical 1-hour requirements for emergency systems.
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    Electrical Performance Under Duress

    99.95% Oxygen-Free Copper Busbars
    Anti-Oxidation Joint Design
    With a minimum conductivity of 57MS/m, these busbars ensure low resistance (≤0.0005Ω/m) even at maximum current loads. Tin-plated connections (5μm thickness) reduce contact resistance by 15% compared to unplated joints, minimizing temperature rise and preventing arcing during prolonged fire conditions.
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    All contact surfaces undergo a dual treatment of nickel underplating and tin topcoating, forming a protective barrier against corrosion. This ensures stable conductivity even in high-humidity or smoke-filled environments, critical for post-fire system functionality.
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    Certifications and Compliance

    Tested by third-party laboratories, this busbar system meets or exceeds:

    ● IEC 61439-6:2019 (Low-voltage switchgear and controlgear – Busbar systems)

    ● EN 50085-2-1 (Fire resistance of cable management systems)

    ● GB 7251.6 (Chinese national standard for fire-resistant busways)

    Applications

    Ideal for facilities requiring reliable emergency power during fires, including:

    ● Hospitals and Healthcare Centers: Sustaining critical medical equipment during fire incidents.

    ● Data Centers and Communication Facilities: Ensuring UPS and backup systems remain operational.

    ● Commercial High-Rises and Shopping Malls: Powering fire alarms, sprinklers, and emergency lighting.

    ● Industrial Plants and Petrochemical Sites: Safeguarding shutdown protocols in hazardous environments.

    Why This Fire-Resistant Busbar?

    Compared to traditional fireproofing methods (e.g., mineral-insulated cables), this dense busbar system offers:

    ● Space Efficiency: 40% smaller footprint than equivalent cable trays, optimizing limited duct space.

    ● Rapid Installation: Pre-fabricated units with standardized flanges reduce on-site assembly time by 50%.

    ● Cost-Effective Safety: Long-term savings from reduced maintenance and compliance with strict fire codes.

    Invest in a fire-resistant power solution that doesn’t just meet regulations—it guarantees peace of mind. Whether retrofitting an existing emergency system or designing a new fire-compliant infrastructure, our busbars deliver unmatched thermal endurance, electrical reliability, and structural integrity when seconds count.

    TO KNOW MORE ABOUT Renyun, PLEASE CONTACT US！

    • sales@rybusbar.com

    • No. 147, South Section of East 11th Road, Economic Development Zone, Changsha, Hunan Province

    Our experts will solve them in no time.