Under Grounding of Power Lines
Under Grounding of Power Lines
(OP)
On one of my roadway design project we are being requested to incorporate future provisions for undergrounding 94.5 KV transmission lines. What does that mean? How do we size the trench and size the conduits for this almost 3 miles of length of roadway. Where can we find standards for such design. What about the Vaults? How many and what type.
Since I am a Civil Engineer by profession any advise in this regard will be appreciated. Thanks
Since I am a Civil Engineer by profession any advise in this regard will be appreciated. Thanks





RE: Under Grounding of Power Lines
94.5 KV lines are not something for us civil "amateurs".
www.SlideRuleEra.net
RE: Under Grounding of Power Lines
RE: Under Grounding of Power Lines
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"...students of traffic are beginning to realize the false economy of mechanically controlled traffic, and hand work by trained officers will again prevail."
Wm. Phelps Eno, ca. 1928
RE: Under Grounding of Power Lines
I would:
1. Ask the utility what they wanted as it will be there work.
2. Assume a 5x5 trench if you get no other information.
3. Keep crossing utilities 6 feet deep min. and parrallel utilities 5 ft away.
4. Accurately mark and map the utilties you install for this work. Monument above ground.
5 Cover utilites with a few inches of concrete, dye the top red and install narking tape. Be sure to use utility marking tape, as it partially metalic and will carry a tone for the mark out person.
6. Back chage the utility for the extra cost of the work. For example, Six foot of excavation will require shoring and additional excavation.
As for the vaults we are installing, they are huge. About 30 by 12 inside. We have also installed much smaller vaults so you really need to check with the utility on what they want. We are also istalling two redundant lines for the duct, complete with two sets of vaults at each location. Vaults are located about 1500 feet apart. This is due in part to the limitations on most cabe pulling equip.
RE: Under Grounding of Power Lines
RE: Under Grounding of Power Lines
RE: Under Grounding of Power Lines
RE: Under Grounding of Power Lines
RE: Under Grounding of Power Lines
RE: Under Grounding of Power Lines