Overhead Conductor Installation Guide Recommended Practices First Edition 6.13 Sag Adjustments When sagging the conductor, the tension adjustments should be completed within one hour. It is good practice to check the sag at more than one location along the line, selecting level sections with similar span lengths. Bundle conductors should all be sagged at the same time. Once the sagging tension is set, it should not be adjusted again. To compensate for conductor creep in situations where the installed conductor has sat in the stringing sheaves and has not been sagged within 24 hours, estimated creep correction curves should be considered. 6.14 Clipping Ideally, conductors should be clipped in within 24 hours after the line is brought into sag. The line tension should never be adjusted again, as creep will have started to take place. IEEE Standard 524 states that the total time for conductors sitting in the sheaves, from initial installation until clipping, should never be more than 72 hours. If this time is exceeded, damage may occur to the conductor and/or sheaves. The installation of dampers, spacers and spacer-dampers should be completed as soon as possible after sagging to prevent damage to the conductors. 7 HARDWARE It is important to ensure that the fittings and hardware be suitable for the conductor (type and temperature rating) being installed. There are numerous overhead conductor splice and dead-end accessories for installations. Always consult with the accessory manufacturer for the correct selection and installation procedure for its product. In general, compression accessories are used on large conductors for transmission lines. These fittings have been used for many years and have proven to be very efficient in being capable of carrying the full mechanical load of any conductors. Compression accessories come as dead-ends, splices, tap-off, jumper terminals, etc. Bolted and preformed products are more commonly used on smaller conductors for distribution lines. For TransPowr® ACSS and ACSS/TW conductors in tension span applications, bolted dead-end fittings must not be used. For TransPowr® T-2® conductors, it is important that the line hardware maintains an even conductor tension balance with the two individual conductors. For splices in T-2® , the conductors are joined by separately splicing each component conductor together. Compression-style splices are preferred; however, for small AWG sizes, provided the utility will allow their use, “automatic” type splices have been used. The splices in the individual component conductors are spaced apart so the adjacent splice bodies do not stack together, as recommended by IEEE Standard 524. Special steps must be followed to ensure the tension balance in the component conductors is maintained. Just beyond the region where the factory-installed conductor bands are located, overlap the two lengths of T-2® conductor by approximately five feet. With the two conductors held side by side, mark the corresponding component conductors where they will be cut. Cut one set of corresponding conductors on their marks and splice together. Once this splice is completed, repeat the same with the other corresponding component conductors. An additional twist may be needed before the second splice is made to remove any looseness between the component conductors. See Figure 9 for an example of a spliced T-2® conductor. Figure 9 - Example of a T-2® Conductor Splice
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