show that length of wire needed to make a heating coil is approximately
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The maximum and minimum recommended ratios of inside-coil diameter to wire diameter are 6:1 and 3:1. The length of the close wound coil may be found using the equation below.
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Coiled or Spiral Elements
d = Wire diameter (mm)
D = Inside-Coil diameter (mm)
L = Length of wire (m)
X = Length of close wound coil (mm)
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