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FT2 on an electrical cord refers to the CSA (Canadian Standards Associations) test designation for wires and cables. FT2 is the minimum mandatory horizontal flame test for Flexible Cord. A burner flame is applied to a horizontal sample for five 15 second applications and must not exceed 100mm from end to end. There should also be no type of flame particles falling from the sample.
At this angle the biggest "area" of the test tube is covered by the flame. Thus it heats up quickly and evenly. Also, by holding the test tube at 45 degrees away from you, you're less likely to be splashed by anything in the test tube boiling over.