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09-30-2007, 07:04 AM #1
09-30-2007, 09:01 AM #2
Exposed PVC is OK as long as it is ummm, schedule 80 (I think). The open PVC would not be OK, nor would the exposed cable.
EMT cannot be run underground, so PVC would be necessary there. The cable should be in some sort of pipe to protect it from damage and sunlight (EMT, rigid or PVC).
Department of Redundancy Department
10-02-2007, 07:34 AM #3
Poor planning is poor planning ad nauseum. I see this kind of thing all the time.
10-02-2007, 03:01 PM #4
The open PVC would not be OK, nor would the exposed cable.
All raceways are required to be terminated in a proper fitting. In this case, that does not mean a watertight or weather tight fitting if that is sunlight resistant UF cable, but the PVC would need, at the very least, say, a bushing, or even a busing with a cable grommet in it. *IF* the cable *is not* UF or some other cable suitable for underground use, then the cable *is not allowed* to be used underground, whether in a conduit or not. Electrical conduits may be discontinuous, are not tested, listed, or labeled to be 'watertight' and are assumed to allow water into them (they do) and threaded conduits have threads which are not tapered to create a water tight seal when tightened, the threads are straight and are designed to make a good 'effectively grounded' continuity across the threaded joint.
EMT cannot be run underground, so PVC would be necessary there.
The cable should be in some sort of pipe to protect it from damage and sunlight (EMT, rigid or PVC).
10-05-2007, 04:10 PM #5
First of all, we need to know exactly what type of cable is used. For example, Romex is not suitable for wet locations ... while UF is.
The pipe may simply be a sleeve for mechanical protection. As such, even Sched 40 PVC or EMT (358.10B) might be acceptable. One really can't say without looking at the location in greater depth.
If, in fact, this is a change in wiring method ... then a junction box (conduit body might be OK) with the proper fittings is required.
10-05-2007, 07:19 PM #6
Neither Sch 40 nor EMT is not allowed to be used there.
(bold and underlining are mine)
300.5 Underground Installations. (bold and underlining are mine)
- (D) Protection from Damage. Direct-buried conductors and cables shall be protected from damage in accordance with (1) through (5).
- - (1) Emerging from Grade. Direct-buried conductors and enclosures emerging from grade shall be protected by enclosures or raceways extending from the minimum cover distance required by 300.5(A) below grade to a point at least 2.5 m (8 ft) above finished grade. In no case shall the protection be required to exceed 450 mm (18 in.) below finished grade.
- - (4) Enclosure or Raceway Damage. Where the enclosure or raceway is subject to physical damage, the conductors shall be installed in rigid metal conduit, intermediate metal conduit, Schedule 80 rigid nonmetallic conduit, or equivalent.
That raceway is subject to physical damage and thus must meet the above "shall be installed in rigid metal conduit, intermediate metal conduit, Schedule 80 rigid nonmetallic conduit, or equivalent.", neither Sch 40 nor EMT is not listed as an option.