US Patent 7639476 Electric power distribution system

When an electric connection box (P) is received inside a cover (50A), a part reception section (34) is exposed to the outside, in an opening (51H) in the upper surface of the cover (50A). As a consequence, there is fear that water on the upper surface of the cover (50A) enters onto the upper surface of a case (20) from a gap between the opening (51H) and the part reception section (34). Water discharge grooves (35, 36) reaching a water discharge path (38) in an outer surface of the case (20) is formed in the upper surface of the case (20), and as a result, water collecting on the upper surface of the case (20)(body section (30)) flows into the water discharge grooves (35, 36) to be reliably discharged.