In this blog, you will learn how to perform two important tests on a Distribution Box
- The Creepage Distance Measurement Test
- The Resistance to Abnormal Heat and Fire Test
Creepage Distance Measurement
This test verifies that the minimum creepage distances between live parts, metal parts, and mounting surfaces meet the requirements specified in the standard.
Step 1: Identify the Rated Voltage
Determine the rated voltage of the assembly being tested. For this Axis 3-Phase DB Box, the rated voltage is 415 V.
Step 2: Measure the Creepage Distance
Measure the shortest path along the surface of the insulating material, using a suitable measuring tool. Follow the surface contour and do not measure through air.
Step 3: Calculate and Verify Compliance
Refer to this creepage distance table in the standard. For 415 V, the minimum required creepage distance is 4 mm. The distribution box passes if the measured creepage distance is equal to or greater than 4 mm.
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Resistance to Abnormal Heat and Fire
This test checks how the insulating parts behave under abnormal heat and fire conditions.
Step 1: Prepare the Test Sample
Select the insulating part of the distribution box that is exposed to thermal stress during a fault. Switch on the machine and insert the sample securely in the glow-wire test machine.
Step 2: Apply the Glow Wire
Heat the glow wire to the specified test temperature as defined in the standard. Apply the heated glow wire to the insulating surface for the specified duration.
Step 3: Verify Test Result
The distribution box passes if there is no sustained flame, any flame extinguishes within the specified time, and there is no ignition of surrounding materials or loss of safety function.
We hope you now have a clear understanding of how to test your Distribution Box. This test is performed at our Axiom Lab in Mumbai, which is accredited by the National Accreditation Board for Testing and Calibration Laboratories (NABL) for ISO 17025-2017 and approved by Underwriters Laboratory (UL).
Thank you for reading and if you found this informative, then feel free to contact us to get a quote or to know more about our products; visit our product section at https://axis-india.com/products/
