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Increasing use of armless construction will minimize, but not completely eliminate the use of crossarms. Pad-mounted, compartmental-type transformers are also replacing, to a large degree, many unaesthetic aerial platform-mounted, transformer installations. The discussion of maintenance necessary for the compo-

nents mentioned assumes all work will be done on unenergized lines (unless specifically noted otherwise) and that all clearance procedures required to provide service, as mandated by TM 5-682, NAF-VAC P-1060, or AFM 32-1078, have been followed.

4-9. Other types of line maintenance.

Trees adjacent to overhead lines pose a line clearance problem, requiring both checking for interferences and trimming on a planned time cycle. Maintenance methods on energized overhead power lines require special training and tools to meet safety requirements, but can reduce service interruption times where operational requirements do not permit the necessary outage period.

Section IV - WOOD POLES

4-10. Life span of wood poles.

The average life span of a full-length pressure-treated wood pole can be maintained and even extended another 10 to 20 years with a proper inspection, treatment, and reinforcement program.

4-11. Supplementary data on wood poles.

Pertinent information is covered in appendix C on why poles fail, initial installation, types of wood used for poles, influence of local conditions, and decay patterns.

4-12.

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