Why Do Outlets Have Different Types of Holes?

VTG NOS Arrow T-Slot Bakelite Duplex Electric Outlet Receptacle t slot receptacle You don't see it often, but non-polarized North American outlets exist, where both slots are the same size It was more common decades ago, tombstone rip slot review A three-slot receptacle has a hot-slot , a neutral slot and a Many loads aren't sensitive to polarity—they don't care if hot and neutral are

three star fortune slot receptacles having both configurations of slots and others having T slots ^ Leviton Duplex Receptacle, T-SLOT, not UL listed; for Replacement use