The core value of fire-resistant busway lies in its continuous power supply capability under fire conditions. According to national standards, a genuine fire-resistant busway must maintain power supply for 1-3 hours at a high temperature of 950°C, ensuring the normal operation of critical facilities such as emergency lighting, fire pumps, and smoke exhaust systems.

The key to assessing quality lies in verifying the fire resistance time rating. Currently, the market divides it 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 proof of fire resistance 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 conditions after fire suppression spraying.

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 traders may use fraudulent methods like copper-clad aluminum. You can distinguish them by requiring suppliers to provide material certificates or conduct on-site sampling inspections.

2. Insulation materials are directly related to fire resistance. High-quality products use materials like mica tape and ceramicized silicone rubber, which are resistant to high temperatures, to wrap conductors, maintaining their insulation properties even when exposed to high temperatures. Flame-retardant materials with a B rating or higher and halogen-free materials are the basic requirements, with heat resistance temperatures of ≥130°C.

3. The shell processing should not be overlooked either. High-quality products use steel materials or aluminum alloy profiles for the shell, which have certain thickness and strength to withstand high-temperature impacts and mechanical collisions during fires. The surface treatment should include complete processes such as acid pickling, phosphating, powder coating, and curing.

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 fire-resistant busway products have passed the GA/T537-2005 standard test, maintaining circuit integrity for over 180 minutes under flame conditions.

Fire-resistant busway technical specifications:

Rated Voltage: 400-690V

Rated Insulation Voltage: AC 1000V

Protection Class: IP65

Short-time耐受电流: 50KA

Rated Frequency: 50-60 Hz

Dielectric Strength: AC 3500V

Our fire-resistant busway utilizes 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 fiber (heat resistance ≥ 1600°C). The housing is made from steel plate with a thickness of 2.0mm or more***, and its surface is treated with rust and oil removal, phosphatization, and then electrostatically coated with fire-resistant powder to prevent combustion under flame conditions. The housing structure features an inner and outer channel design, preventing direct or indirect flame from burning the conductor or damaging the insulation, while ensuring the necessary protection level and circuit integrity during spray irrigation.