How many inches of thermal expansion occur for 100 feet of rigid nonmetallic conduit due to temperature changes between -15°F to 105°F?

To determine the amount of thermal expansion for 100 feet of rigid nonmetallic conduit as a result of temperature changes from -15°F to 105°F, we first calculate the total temperature change involved, which is 105°F - (-15°F) = 120°F.

Nonmetallic materials typically have a coefficient of linear expansion in the range of about 0.000004 to 0.000006 per degree Fahrenheit. For the purpose of this calculation, let's use an average value of approximately 0.0000055 per degree Fahrenheit.

Using the formula for thermal expansion, which is:

Expansion = Original Length x Coefficient of Expansion x Temperature Change

we can substitute the values:

• Original Length = 100 feet (which is 1200 inches, since 1 foot = 12 inches)

• Coefficient of Expansion = 0.0000055

• Temperature Change = 120°F

Now, substituting in the values:

Expansion = 1200 inches x 0.0000055 x 120 = 0.792 inches

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