Lane Electric Cooperative
 787 Bailey Hill Road · PO Box 21410 · Eugene, Oregon 97402 · 541.484.1151

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787 Bailey Hill Road
PO Box 21410
Eugene, Oregon 97402
541.484.1151

Typical Trench

The trench detail is for a large joint trench. If you do not have sewer, water or phone, the ditch can be modified to accomadate just the facilities that will be there.
Typical trench detail

  1. Before digging call for Underground locates:
    (1-800-332-2344) at least 48 hours prior to digging.
  2. All Trenches must be a minimum of 36” deep.
  3. If 36” depth cannot be achieved, contact Engineering
  4. If Trench is to be a joint trench (shared with other utilities) the following separations must be maintained:
    1. Between gas and electric lines – 24”
    2. Between water and electric lines – 12”
    3. Between sewer and electric lines – 24”
    4. Between communications and electric lines – 12”
  5. If Trench is to be power only, the ditch needs be wide enough to accommodate the conduit, i.e. a 4” ditch-witch trench is sufficient.
  6. If the Trench is dug through rough, rocky terrain, the conduit must be bedded with a minimum of 4” of sand.
  7. All conduits must be Schedule 40 PVC.
  8. All primary conduit (7200V) must be 2” diameter with 36” radius long sweeping elbows at any 90° bend.
  9. Secondary (120/240V) conduit for a 200 Amp. service must be 2” diameter, with 36”radius long sweeping elbows at any 90° bend.
  10. Secondary (120/240V) conduit for a 400 Amp. service must be 3” diameter, with 36” radius long sweeping elbows at any 90° bend.
  11. There will be no more than 270° of bend (3- 90° bends or 2- 90° & 2- 45°) in any one run of conduit, primary or secondary, between devices.
  12. All Primary conduit must be proved by mandrill.
  13. Polypropylene pull string must be left in all conduits, primary and/or secondary.
  14. Where transformers and primary or secondary junction boxes are to be installed, specifications must be obtained from L.E.C. Engineering Department.
  15. After the Trench is dug and conduit installed, call Lane Electric Cooperative (541- 484 –1151) to have an inspection scheduled by Operations Department.
  16. After the Trench and the conduit are inspected, the Trench may be back-filled.

Complete Booklet

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(693KB PDF)

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