440v lines and chilled water lines

[matman]

I am working on an installation where the existing chilled water lines and 440v feeder cables are run in the same trench (13" wide). The chilled water lines are insulated, but the 440v cables do not appear to be rated for direct burial. The trench cut into the concrete floor inside a building. The building is located in Damneck VA. Can these water and power lines co-exist in the same small trench?

 

[bennie]

Re: 440v lines and chilled water lines

The cable should be marked 600 volt USE. The cable can be in the same trench, unless there is local rules to prohibit the activity.

 

[websparky]

Re: 440v lines and chilled water lines

Please check this section of the code also.

2002 NEC
300.5 Underground Installations.
(C) Underground Cables Under Buildings. Underground cable installed under a building shall be in a raceway that is extended beyond the outside walls of the building.
(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.
(2) Conductors Entering Buildings. Conductors entering a building shall be protected to the point of entrance.
(5) Listing. Cables and insulated conductors installed in enclosures or raceways in underground installations shall be listed for use in wet locations.