bigdog wrote:300.50 B
300.50(B) is not applicable to that installation as 300.50 is under LL. Requirements for over 1000 Volts Nominal.
Look in 300.4 Protection Against Physical Damage, and 300.5 Underground installations.
300.4 Protection Against Physical Damage. Where subject to physical damage, conductors, raceways, and cables shall be protected.
Which means looking in the UL White Book for the uses that Sch 40 PVC and Sch 80 PVC are approved for: (place cursor over link, right click, select 'Open in new tab')
https://code-authorities.ul.com/wp-cont ... e-Book.pdf On page 47/1122, look for the heading "Rigid Nonmetallic PVC Conduit" "(DZYR)".
- Second paragraph down says: (underlining is mine)
- - Schedule 40 conduit is suitable for underground use by direct burial or encasement in concrete. Schedule 40 conduit marked ‘‘Directional Boring’’ (or ‘‘Dir. Boring’’) is suitable for underground directional boring applications.
Schedule 40 conduit is also suitable for aboveground use indoors or outdoors exposed to sunlight and weather
where not subject to physical damage. Schedule 40 conduit marked ‘‘Underground Use Only’’ is only suitable for underground applications.
- Third paragraph down says: (underlining is mine)
- - Schedule 80 conduit has a reduced cross-sectional area available for wiring space and is suitable for use wherever Schedule 40 conduit may be used.
The marking ‘‘Schedule 80 PVC’’ identifies conduit suitable for use where exposed to physical damage and for installation on poles in accordance with the NEC.
Article 352
- 352.12 Uses Not Permitted. PVC conduit shall not be used under the conditions specified in 35212(A) through (E).
- - (C) Physical Damage. Where subject to physical damage unless identified for such use.
So ... if PVC is being used, and the location is subject to physical damage, Sch 80 is required, not Sch 40.
300.5 Underground Installations.
- (D) Protection from Damage. Direct-buried conductors and cables shall be protected from damage in accordance with 300.5(D)(1) through (D)(4).
- - (review (D)(1 through (D)(3), t0o much to retype here)
- - (D)(1) Emerging from Grade. (review this as it defines the area 'subject to physical damage')
- - (D)(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, RTRC-XW, Schedule 80 PVC conduit or equivalent.