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.
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13 ft * 10 ft = 130 ft2 1 ft2 = 0.0929 m2 130 ft2 * 0.0929 m2 / ft2 = 12.08 m2
400 ft x 200 ft = 80000 ft2 80000 ft2 ÷ 43560.17 ft2/acre = 1.83654 acres
1 foot = 12 inches, so that 28/12 ft x 48/12 ft = (7/3 x 4) ft2 = 28/3 ft2 = 9.33333333 ft2 = 9 1/3 ft2
1 acre = 43560 ft2 843 acres = 36721080 ft2
12600 ft2 ÷ 43560.17 ft2/acre = 0.289255 acre