superdave02
Member
- Location
- South East
- Occupation
- Electrical Consultant
Does a 15', straight run of 3/4" PVC, between two securely mounted junction boxes, in NC, need an expansion fitting? Asking for a friend.
That's what I thought. I just needed someone smarter than I to confirm! A 10' stick of PVC would need an expansion fitting in NC! Crazy.
My calculation in Florida is closer to needing on e at 12', and I m the only one I have seen actually do that here.That's what I thought. I just needed someone smarter than I to confirm! A 10' stick of PVC would need an expansion fitting in NC! Crazy.
1/4" / 3.38 * 10-5 1/F = 7.4 * 103 in-F, or 616 ft-F. So you take your high temp and your low temp in degrees F, take the difference and divide it into 616 to find the length in ft at which you need an expansion fitting for a straight run between two fixed points. E.g. high temp = 80F, low temp = 30F, and you get 12.3'.My calculation in Florida is closer to needing on e at 12', and I m the only one I have seen actually do that here.