When drilling a hole through an exterior wall to route a telephone cable to the interior, how should the hole be drilled?

Drilling the hole sloped upward from the outside is essential for preventing potential water ingress into the building. When a hole is drilled at an upward angle, it allows any moisture that may enter the hole to drain out rather than pooling inside the wall cavity. This is particularly important for exterior walls, which can be exposed to rain and other environmental elements that could lead to water infiltration.

Having a hole that allows water to escape helps maintain the integrity of the wall structure and prevents damage such as mold growth or wood rot. This practice is a standard precaution taken by installers when routing cables, as it contributes to the long-term performance and safety of the installation.