Tight-buffered cables are not recommended above which feature?

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Multiple Choice

Tight-buffered cables are not recommended above which feature?

Frost depth determines where underground cables are protected from freeze–thaw damage. Tight-buffered cables have a thin buffer around each fiber and are more vulnerable to moisture and temperature cycling when buried shallowly. The frost line is the depth to which the ground freezes in winter, so staying below that depth keeps the cable out of freeze–thaw effects and soil movement. That's why tight-buffered cables are not recommended above the frost line. The other options (equator, sea level, ground surface) aren’t used to define burial depth for this purpose.

Frost depth determines where underground cables are protected from freeze–thaw damage. Tight-buffered cables have a thin buffer around each fiber and are more vulnerable to moisture and temperature cycling when buried shallowly. The frost line is the depth to which the ground freezes in winter, so staying below that depth keeps the cable out of freeze–thaw effects and soil movement. That's why tight-buffered cables are not recommended above the frost line. The other options (equator, sea level, ground surface) aren’t used to define burial depth for this purpose.

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