This BSI 360° Lab VR video gives an insight into how the Glow Wire rig works when testing the heat and fire resistance of electrical components (such as electrical cables).
The test method is used to check the electrically heated component's ability to ignite or, ability to propagate a flame. If the test product ignites it will be contained safely inside the bounds of the rig.
For more information visit https://page.bsigroup.com/BSI360VRWebsite