Re:Home Depot stocked shelves with empty boxes in its early ...
by hajile on Friday June 08, 2018 @11:59AM
(#17266706)
I looked it up (I read the code a lot when working in that field, but that was well over a decade ago now). Physical damage is in 352.10 (F) and 352.20 (C). Support distance is in 352.30.
To be more complete, Schedule 80 is permitted in areas subject to physical damage, but not schedule 40 (much more common). Likewise the AHJ (authority having jurisdiction) has ultimate say. In the area I worked (and in most jurisdictions from what I was told), you had better have a very good reason for exposed PVC outside of service entrances or similar.
EDIT: for sake of thoroughness, At a service entrance, you have overhead and underground. Overhead will be using RMC (rigid metallic conduit) to the meter. You can usually get permission to use PVC from the meter to the outside shutoff (required for non back-to-back panel installations) and can usually run a couple feet of PVC from there to turn under the house. I saw someone run an outside exposed PVC from the panel to the HVAC and it got called immediately (bury, put in the wall, or switch to EMT). With trailer installs, I've seen them permit a jump from the pole to the trailer above ground if a box was built around the PVC at the crossing.
It's worth remembering that the NEC is both a minimum requirement and a suggestion at the same time. The AHJ is given a lot of leeway because the minimum requirement doesn't fit every situation. Likewise, loads of districts use outdated versions of the code (that may not sound big, but things like AFCI (arc fault breakers) in bedrooms still isn't required in a lot of districts because they are on the 199x or early 200x code).
To be more complete, Schedule 80 is permitted in areas subject to physical damage, but not schedule 40 (much more common). Likewise the AHJ (authority having jurisdiction) has ultimate say. In the area I worked (and in most jurisdictions from what I was told), you had better have a very good reason for exposed PVC outside of service entrances or similar.
EDIT: for sake of thoroughness, At a service entrance, you have overhead and underground. Overhead will be using RMC (rigid metallic conduit) to the meter. You can usually get permission to use PVC from the meter to the outside shutoff (required for non back-to-back panel installations) and can usually run a couple feet of PVC from there to turn under the house. I saw someone run an outside exposed PVC from the panel to the HVAC and it got called immediately (bury, put in the wall, or switch to EMT). With trailer installs, I've seen them permit a jump from the pole to the trailer above ground if a box was built around the PVC at the crossing.
It's worth remembering that the NEC is both a minimum requirement and a suggestion at the same time. The AHJ is given a lot of leeway because the minimum requirement doesn't fit every situation. Likewise, loads of districts use outdated versions of the code (that may not sound big, but things like AFCI (arc fault breakers) in bedrooms still isn't required in a lot of districts because they are on the 199x or early 200x code).