By Lawrence M. Slavin
This handbook presents a common evaluation of tools utilized in putting application cables belowground, together with formal underground conduit structures and comparatively inexpensive direct-buried amenities - with an emphasis on cost-effectiveness and area potency. "ASCE handbook of perform for Belowground Pipeline Networks for application Cables" describes prior practices, in addition to more moderen thoughts within which person pipes or ducts will be advantageously deployed together with direct-buried cables. comparable layout, development, and operational standards and guidance are supplied all through this ebook, in addition to analyses of issues together with: underground conduit structures, direct-buried structures, cable set up tools in duct, hybrid belowground cable networks, prestige of less than floor Cable Networks. This ebook offers either introductory and particular layout and development details to help the implementation of the proposed hybrid belowground cable community. it is going to be important to new and skilled engineers in highway and group building, software proprietors, and contractors.
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This guide offers a basic evaluate of equipment utilized in putting application cables belowground, together with formal underground conduit structures and comparatively inexpensive direct-buried amenities - with an emphasis on cost-effectiveness and area potency. "ASCE handbook of perform for Belowground Pipeline Networks for software Cables" describes earlier practices, in addition to newer ideas during which person pipes or ducts could be advantageously deployed along side direct-buried cables.
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Extra info for Belowground Pipeline Networks for Utility Cables
An additional consideration is the number and type of utility cables being installed. For joint-trench operations, or in a new-build situation in which surface restoration is not an issue, the advantages and ﬂexibility of open-cut trenching may outweigh the advantages of cable plowing. The NESC speciﬁes that plowing procedures and equipment should be such as to avoid damage to cables because of soil containing rock or solid material or bending, sidewall pressure, or excessive tension. In conventional chute plowing, the cable is fed from a reel, supported on the mobile tractor, through a slot in the plow blade mounted at the rear of the tractor.
Although HDPE innerduct has a high degree of inherent toughness, large rocks should be removed from the immediate vicinity of the duct. During placement, the duct should be fed off the bottom of the reel, with only one person placing the duct into the trench. , but excessive tension on the innerduct should be avoided to avoid distortion or necking. In general, the supplier’s guidelines should be followed with respect to minimum bend radii and other handling practices. The use of appropriate duct plugs or caps and coupling accessories during or immediately after the innerduct placement is important to ensure the long-term integrity of the completed system.
In general, the rules and practices in this section refer to the installation of bare cables placed within the ground, without supplementary protection, as well as “direct-buried supply and communication cables installed in duct that is not part of a conduit system,” as speciﬁed in the National Electrical Safety Code (IEEE 2007). 1 Safety-Based Requirements The NESC rules provide the following requirements (IEEE 2007): • Cable properties: º effective grounding of cables operating at > 600 V and º appropriate marking and designation on the outer jacket.
Belowground Pipeline Networks for Utility Cables by Lawrence M. Slavin