Can holes be drilled under the distribution box

Drilling a hole under a distribution box is only permissible under strict conditions, primarily for drainage in surface-mounted boxes, and must follow manufacturer and safety guidelines.General GuidelinesFor standard distribution boxes, drilling a hole under the box is generally allowed only for drainage purposes and only if the box is surface-mounted, pedestal-mounted, or pendant-mounted in a damp or wet location. The hole should be at the lowest point of the box to allow water to escape, and its diameter must be between 3 mm (1/8 inch) and 6 mm (1/4 inch) unless a drainage fitting is used. Holes should not be drilled near edges, corners, knockouts, or screw bosses, and flush-mounted boxes should never have drainage holes drilled .Explosion-Proof or Hazardous Location BoxesFor explosion-proof distribution boxes, drilling is technically feasible but requires strict adherence to safety regulations. The drilling process must avoid damaging internal components, use the correct drill bit size, control drilling speed to prevent overheating, and ensure debris is cleaned to maintain safety performance. After drilling, the box must be inspected and tested to confirm that its safety rating is not compromised .Underground or Pull BoxesIf the distribution box is installed underground, such as a pull box or handhole, drilling under the box is generally not recommended. Instead, proper drainage is achieved by placing a layer of crushed rock or gravel at the bottom of the excavation to prevent water accumulation. Conduit entry points should be cut carefully, and the box should be leveled and backfilled to avoid deformation or water intrusion .Key ConsiderationsAlways check the manufacturer's instructions before drilling.Ensure no live conductors are present during drilling to prevent damage or electrical hazards.Avoid compromising the IP/NEMA rating of the enclosure.For hazardous or explosion-prone environments, follow strict safety protocols and perform post-drilling inspections. In summary, drilling under a distribution box is permissible only in specific cases, primarily for drainage in surface-mounted boxes, and must be done carefully to maintain safety and compliance. For underground or flush-mounted boxes, alternative drainage methods should be used instead.