1100 C UL 74A Glow wire equipment, For Fire Hazard Yest, 5

CKINSTO UL 74A Glow Wire Equipment Description The CKINSTO Glow Wire Test Apparatus (or Glow Wire Testing Machine) is a specialized piece of automated equipment designed to assess the fire hazard resistance and flammability of insulating materials and non-metallic components used in electrical and electronic products. This is done by simulating the short-term thermal stress caused by an overheating component or an electrical fault. Key Purpose and Standard Compliance Primary Use: To evaluate the fire risk of plastic and other non-metallic materials, particularly those near current-carrying parts in electrical appliances, lighting equipment, and low-voltage apparatus. Simulates: The effect of heat from potential ignition sources like overloaded connections or searing elements. Standards: The equipment is designed to comply with a range of international safety standards, including: UL 746A: Standard for Polymeric Materials – Short Term Property Evaluations (The standard specifically referenced in your query). IEC 60695-2-10 (Glow-wire apparatus and common test procedure). IEC 60695-2-11, -12, -13 (covering End Product Testing, Flammability Index - GWFI, and Ignition Temperature - GWIT). Other standards like IEC 60335-1 (Safety of Household Appliances). Technical Features of the Equipment Modern CKINSTO models are often fully automated and feature advanced control systems: Glow Wire: A 4 mm diameter wire loop made of Nickel-Chromium (80:20 Ni/Cr alloy), which is electrically heated. Temperature Control: Uses a PID Digital Temperature Controller to regulate the temperature of the glow wire, typically up to $1000^{\circ}\text{C}$ or $1100^{\circ}\text{C}$, ensuring high temperature stability and precise results. Current Source: An auto current source with a CT-operated ammeter capable of delivering up to 150A heating current. Specimen Holder: A motorized or preloaded specimen holder trolley that applies a specified force (typically $1.0 \text{ N}$) to press the test sample against the heated glow wire for a set time (usually 30 seconds). Control System: Often uses a PLC-controlled system with a Touchscreen Interface for intuitive operation, monitoring, and automated data recording of parameters like: Application Time Ignition Time ($t_{i}$) Flame Duration ($t_{a}$) Extinguishing Time ($t_{e}$) Chamber: Enclosed test chamber, sometimes with an exhaust fan, to ensure controlled testing conditions and safe smoke removal. This apparatus allows manufacturers to determine the material's Glow Wire Flammability Index (GWFI)—the highest temperature at which the material self-extinguishes within 30 seconds—and the Glow Wire Ignition Temperature (GWIT)—the lowest temperature causing sustained ignition. Glow-wire Test Apparatus According to UL746A, IEC829, DIN695 and VDE0471 for Flammability Index Test provides a visual example of a similar glow-wire test setup and its application in flammability testing.