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2. Design differences between overhead and underground systems
The purpose of this section is to explain how overhead and underground networks differ in terms of design and operation, and why the transition from one to the other cannot be made without an overall analysis.
These considerations only apply to MV, as LV overhead (mostly twisted) and underground networks in France have the same tree-like structure. On the other hand, the sophistication required for underground connections and their accessories makes LV networks more expensive.
2.1 Why the different layouts?
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Design differences between overhead and underground systems
Cost of underground
Websites
Public service contract between the French State and EDF http://www.industrie.gouv.fr/energie/electric/csp2005.htm
EDF distributor http://www.edfdistribution.fr see technical reference and environmental protection...
Regulations
Technical decree of May 17, 2001 setting the technical conditions to be met by electrical power distribution systems.
http://www.droit.org/jo/20010612/ECOI0100130A.html
And its version illustrated...
Standardization
NFC 11-201 of October 1996 (and its amendment A1 of December 2004) concerning electrical power distribution networks (Construction rules)
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