NEMA locking-blade inlets mount to surfaces and connect with plugs to distribute power. They secure when twisted to prevent unintended disconnections. These inlets are made to standards designated by the US National Electrical Manufacturers Association (NEMA). They are rated for different current ratings and have various socket configurations to prevent mismatched connections. Industrial inlets have rugged constructions suitable for harsh settings where impacts, corrosion, and hot/cold temperatures are concerns. Watertight inlets seal out water and debris to provide safe connections in wet and corrosive environments.