Table

PVC Conduit Thermal Expansion Table

PVC Conduit Thermal Expansion Table reference with assumptions and boundary notes.

Reference boundary

Thermal expansion arithmetic only. Manufacturer expansion-joint instructions, conduit type, supports, and field conditions govern installation details.

Reference table

Estimate PVC conduit length change from run length and temperature change using a rounded expansion coefficient.

Formula basis: movement = length x temperature change x 0.052 mm per metre per C, rounded for preliminary checks.
Run length (m)Temperature change (C)Estimated movement (mm)Estimated movement (in)Boundary
102010.40.41Manufacturer expansion-joint placement instructions still govern
104020.80.82Manufacturer expansion-joint placement instructions still govern
302031.21.23Manufacturer expansion-joint placement instructions still govern
304062.42.46Manufacturer expansion-joint placement instructions still govern
50401044.09Manufacturer expansion-joint placement instructions still govern
50601566.14Manufacturer expansion-joint placement instructions still govern
Use notes
  • Use this table for preliminary reference and arithmetic checks only.
  • Confirm equipment ratings, product markings, installation conditions, utility requirements, and the local authority requirements before design or field use.