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Pole line configuration will include provisions for raptor protection in accordance with Federal and state laws. C. ) as amended; the Endangered Species Act of 1973 (87 Stat. C. ) as amended. S. Department of the Interior and Federal, state and local land management or wildlife conservation agencies. 6-3. Conductors. a. Sizes. Where possible, conductor sizes will be limited to a maximum of No. 4/0 AWG copper or equivalent aluminum. Conductor sizes above No. 4/0 AWG copper or equivalent aluminum will be justified by an economic analysis of the alternatives (such as additional circuits or a higher distribution or sub-transmission voltage).

X" CONNECTION "T" CORNER SERVICE DROP US Army Corps of Engineers Figure 6-5. Neutral-Supported Secondary Cable Configurations. 6-11 TM 5-811-1/AFJMAN 32-1080 spool insulators for low-voltage circuits; and strain insulators for insulating guy wires. In crossarm construction, pin insulators may be used as a designer’s option, but line-post insulators are superior in operation to corresponding pin types since line-post units are stronger, more resistant to vandalism, and inherently more radio-interferencefree.

At the supply point, a three-phase transformer with automatic load tap changers may be provided. d. Transformers. (1) Single-phase, self-cooled with provisions to increase capacity if externally cooled, delta wye if connected for three-phase service. Nonflammable liquid or epoxy insulation is preferred; however, high-fire-point liquid or oil insulation may be provided if it is approved by the HOST/REQ CMD. 4-16 (2) Three-phase transformers, delta wye connected, are preferred in lieu of single-phase transformers, size permitting, where the load can be served by a single three-phase transformer and where the transformer can be easily repaired or replaced upon failure of any winding and the load can be interrupted during such repair period.

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