Pole holes should be backfilled and tamped to a depth of how many millimeters?

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Multiple Choice

Pole holes should be backfilled and tamped to a depth of how many millimeters?

The key idea is providing a stable, well-compacted collar around the base of the pole so the loads from wind and ground conditions transfer properly into the surrounding soil. Backfilling and tamping to about six inches (152 mm) ensures the soil around the base is dense, void-free, and able to resist uplift and lateral movement without requiring excessive embedment. This depth is a balanced standard that gives enough bearing and restraint while keeping the pole at an appropriate depth for grade and hardware. Deeper backfills would be unnecessary for typical soil conditions and deeper embeds can complicate installation, while shallower fills might not provide enough support and could lead to settlement.

The key idea is providing a stable, well-compacted collar around the base of the pole so the loads from wind and ground conditions transfer properly into the surrounding soil. Backfilling and tamping to about six inches (152 mm) ensures the soil around the base is dense, void-free, and able to resist uplift and lateral movement without requiring excessive embedment. This depth is a balanced standard that gives enough bearing and restraint while keeping the pole at an appropriate depth for grade and hardware. Deeper backfills would be unnecessary for typical soil conditions and deeper embeds can complicate installation, while shallower fills might not provide enough support and could lead to settlement.

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