Electrician Red Seal · Question
Expansion joints are required for straight runs of rigid PVC conduit to compensate for thermal expansion and contraction. At what approximate length change per 30m of conduit might one be needed for a 50°C temperature change?
According to CEC Appendix B on Rule 12-1114, PVC conduit changes length by approximately 6.8 mm for every 10°C change in temperature over a 10m length. A 50°C c
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Question: Expansion joints are required for straight runs of rigid PVC conduit to compensate for thermal expansion and contraction. At what approximate length change per 30m of conduit might one be needed for a 50°C temperature change?
Answer options:
- 20 mm
- 50 mm ✅ 100 mm
- 150 mm
Correct answer: 100 mm
Explanation: According to CEC Appendix B on Rule 12-1114, PVC conduit changes length by approximately 6.8 mm for every 10°C change in temperature over a 10m length. A 50°C change over 30m results in a length change of (6.8 mm * (50/10) * (30/10)) = 102 mm. An expansion joint is required to accommodate this movement.
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