Service entrance cables shall be supported by straps or other approved means within ___ of every service head, gooseneck, or connection to a raceway or enclosure.

Service entrance cables must be securely supported to prevent mechanical damage and maintain the integrity of the electrical system. The requirement to support these cables within 1 foot of every service head, gooseneck, or connection to a raceway or enclosure is established to ensure that there is minimal stress on the electrical conductors. This distance is considered sufficient to allow for movement or expansion of the cables while preventing undue strain that could lead to wear or failure over time. Adequate support is critical in maintaining safety and ensuring reliable performance of the electrical system. Hence, the support requirement is clearly set at 1 foot for proper installation practices.