Electrical cords and power outlets have changed a lot over the years, but they've always had holes in the prongs. But do the ...

The National Electrical Manufacturers Association (NEMA), which establishes the technical standards for electrical equipment ...

Electrical plugs and outlets come in many different shapes and sizes. Why do the holes in electrical outlets have such ...

To childproof the outlet, you can buy plastic plugs that ... from sticking something in the hole. The little doors open only when two objects (like a standard plug) are pushed simultaneously ...