Fire-resistant busway, in addition to the conductive function of a regular busway, must maintain circuit integrity for a certain period under flame conditions. Our company's fire-resistant busway products have passed the GA/T537-2005 standard test, maintaining circuit integrity for over 180 minutes under flame conditions.
Thermal Insulation Busway Technical Parameters:
Rated Voltage: 400-690V
Rated Insulation Voltage: AC 1000V
Protection Level: IP65
Short-time耐受电流: 50KA
Rated Frequency: 50-60 Hz
Dielectric Strength: AC 3500V
Our fire-resistant busway uses T2*** conductive copper strips with copper content ≥99.95% and resistivity ≤0.01777 Ω.MM2/M. The conductor surface is wrapped with 3 or more layers of mica tape insulation (heat resistance ≥ 1100°C), and heat insulation is achieved between the conductor and housing with silica棉 (heat resistance ≥ 1600°C). The housing is made of steel plate with a thickness of 2.0mm or more***, and the surface is treated with rust and oil removal, phosphatization, and then electrostatically coated with fire-resistant powder, ensuring the housing does not burn in flame conditions. The housing structure is an internal and external channel, preventing direct or indirect burning of the conductor and destruction of insulation, and ensuring the necessary protection level and circuit integrity under spray conditions.
The core value of fire-resistant busway lies in its ability to maintain power supply under fire conditions. According to national standards, a genuine fire-resistant busway must sustain power supply at 950℃ for 1-3 hours, ensuring the normal operation of critical facilities such as emergency lighting, fire pumps, and smoke extraction systems.
The key to identifying quality lies in verifying the fire resistance time rating. Currently, the market is divided into four grades: A (30 minutes), B (60 minutes), C (90 minutes), and D (120 minutes). However, the actual requirements for many important projects often exceed these standards, often demanding fire resistance certifications for 180 minutes or even longer.
The most professional testing method involves conducting both spray test and fire resistance test simultaneously: First, heat the test joint for a period of time using a flame (750°C - 800°C or 950°C - 1000°C), then spray water according to specifications to simulate the actual situation after fire suppression water is applied.
1. Conductor material is the primary inspection point. High-quality fire-resistant busbars are made of high-purity electrolytic copper (≥99.9%), fully tin-plated, with a conductivity of ≥97%. Some unscrupulous merchants may use fraudulent methods like copper-clad aluminum. You can distinguish by requiring suppliers to provide material proof or on-site sampling inspections.
2. Insulation materials are directly related to fire resistance. High-quality products use materials like mica tape and ceramic silicone rubber, which are resistant to high temperatures, to wrap conductors. Even exposed to high temperatures, they can maintain their insulation properties. Flame-retardant and halogen-free materials at B grade and above are the basic requirements, with a heat resistance temperature of ≥130°C.
3. The shell manufacturing process cannot be overlooked either. High-quality products use steel materials or aluminum alloy profiles, which offer certain thickness and strength to withstand high-temperature impacts and mechanical collisions during fires. Surface treatment should include processes such as pickling, phosphatizing, powder coating, and curing.
