Why do some appliances and tools only have two prongs and no grounding prong?

These products are "double-insulated" and do not need the added protection of a grounding plug. You can plug them into ungrounded outlets and still be protected.

Check your state and local codes before starting any project. Follow all safety precautions. Information in this document has been furnished by the North American Retail Hardware Association (NRHA) and associated contributors. Every effort has been made to ensure accuracy and safety. Neither NRHA, any contributor nor the retailer can be held responsible for damages or injuries resulting from the use of the information in this document.