IEC 61386-1 Clause 12 Figure 8 Heat Resistance Test Device for Cable Conduit

The LS-GWC-1 Heat Resistance Test Device for Cables is used for testing the heat resistance of non-metallic and composite catheters. During testing, the catheter sample is cut to a specified length and placed in a high-temperature environment with the device for a specified period of time under constant temperature, simulating the use of the catheter under high-temperature conditions. After heating, a load perpendicular to the axis is applied to the sample through a steel rod and weights within the device and maintained for a specified time, allowing the sample to cool to room temperature under the load. After cooling, the load is removed, and a gauge is immediately passed through the vertically aligned sample under its own weight. Whether the gauge passes through smoothly determines whether the catheter’s heat resistance meets the standards, providing a standardized testing procedure for verifying the compliance of catheter heat resistance performance.

Standard:

Specification:
• Steel rod diameter: 6mm
• Steel rod weight: 500g
• Impact Weight: 0.5KG, 0.5KG, 1.0KG, 2.0KG, 4.0KG and 8.0KG
•  According to the standard requirements, the 400℃ high temperature test chamber GW-225-400 must be selected as a supporting accessory. 

Operation Instruction:
• Cut the required catheter into samples with a length of 100 ± 5mm. Place the samples along with this instrument in an oven for 4 hours ± 5 minutes, with the temperature inside the oven based on Table 2 of IEC 61386-1:1996 (GB 20041.1-2005 )”onduit systems for electrical installations- Part 1:General requirements”, with an error of ± 2°C.
• After the heating stage is completed, lift the steel rod, place it on the specimen, and apply the corresponding weights to exert force for 24 hours ± 15 minutes, ensuring that the load is perpendicular to the axis of the conduit.
• The total load applied to the specimen, including the steel rod, should comply with the standard, and the load should be applied to the middle part of the specimen. The specimen should then be allowed to cool to room temperature under the applied load.
• Then remove the load and immediately allow the relevant gauge to pass through the specimen, which is in a vertical position, without any initial velocity and under its own weight, through the conduit.

Table 2- Upper Temperature range

Figure 8 Test apparatus for resistance to test