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On a typical U.S. household plug, the two flat prongs—also called blades—carry current: the narrower blade is intended to connect to hot, and the wider blade to neutral. A round third prong, when present, connects the appliance to equipment ground. These parts establish the electrical connections; they are not just supports that make the plug fit.
What the prongs are called—and what they connect
The projecting metal contacts on a plug are commonly called prongs. On North American plugs, the flat contacts are usually called blades; a round contact is a pin. The plug is the male connector on the cord. The wall-mounted device it enters is a receptacle, though many people call it an outlet.
- Narrow flat blade: Normally the hot, or ungrounded, conductor in a correctly wired U.S. system.
- Wide flat blade: Normally the neutral, or grounded, conductor in a correctly wired polarized U.S. system.
- Round third pin: Equipment ground on a common grounded U.S. plug. It is a safety connection, not a normal operating-current conductor.
The hot conductor carries current from the source through the appliance, and neutral provides the return path. Both are part of the circuit. The intended blade arrangement is not proof that a receptacle is wired correctly. See the Electrical Safety Foundation International’s home electrical system guide for an overview.
Why some plugs have two prongs and others have three
Two-prong plugs
A two-prong appliance is designed to operate without a separate equipment-grounding connection. Its blades may be equal in width, making it nonpolarized, or different in width, making it polarized. Neither the number of prongs alone nor the plug’s age tells you whether an appliance is safe; design, condition, wiring and correct use all matter.
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Three-prong plugs
On a common North American grounded plug, the two flat blades carry normal operating current and the round pin connects exposed conductive parts of the appliance to the equipment-grounding system. If a fault brings an energized wire into contact with a metal case, the ground path is intended to carry fault current so a fuse or breaker can interrupt the circuit. This reduces risk; it does not eliminate every shock hazard. The U.S. Consumer Product Safety Commission’s electrical product safety evaluation explains the role of grounding.
On common U.S. grounded plug designs, the ground pin is longer so it makes contact first and disconnects last. That helps establish the grounding connection before the current-carrying blades engage.
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What “polarized” and “grounded” mean
These describe different features. A polarized plug is shaped to insert in only one orientation, commonly by using one wide blade and one narrow blade. A grounded plug has a separate equipment-grounding contact, usually the round third pin. A two-prong plug can be polarized or nonpolarized; a typical three-prong plug is both polarized and grounded.
Polarization helps keep switches and some internal appliance parts on the intended side of the circuit, but it does not make an appliance harmless when switched off or guarantee every internal part is de-energized. The intended neutral connection is only as reliable as the wiring. The CPSC’s electrical product safety evaluation discusses polarized and older two-pole designs.
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If a plug will not fit, is damaged, or feels hot
| What you notice | What it may mean | Safer next step |
|---|---|---|
| A three-prong plug will not fit a two-slot receptacle | The receptacle lacks the grounding opening for that plug. | Do not force the plug or cut off its ground pin. Have a qualified electrician assess the wiring and suitable options. |
| A prong is loose, cracked, burned, melted, or partly detached | The plug may make poor contact or expose a shock or overheating hazard. | Stop using it. Replace a compatible detachable plug or cord only with a correctly rated part and arrangement; have a molded plug or appliance professionally repaired or replaced. |
| The grounding pin is missing or broken | The appliance’s grounding protection has been defeated. | Do not use it. Replace the cord or plug appropriately, or have the appliance repaired. |
| The plug falls out or the receptacle does not grip it firmly | Receptacle contacts may be worn, creating a poor connection. | Stop relying on it and have the receptacle replaced. ESFI advises against outlet-tightening inserts; see its unsafe electrical adapter guidance. |
| The plug or cord feels hot, or there is burning, buzzing, or sparking | Possible overload, damaged wiring, arcing, failing equipment, or poor contact. | Stop using the circuit or device. Unplug only if it is safe to do so; if there is smoke, active sparking, or fire, keep away and contact emergency services. Arrange a qualified evaluation. |
| Exposed male prongs at both ends of a cord | Either end can become energized and create electrocution or fire danger. | Never use it. On March 31, 2026, CPSC warned consumers to stop using male-to-male extension cords: CPSC warning. |
Grip the plug body when unplugging, not the cord. Do not straighten a severely bent blade while a plug is connected. A plug that fits is not necessarily safe: check the appliance, cord and circuit ratings, and do not overload cords or power strips. CPSC advises stopping use of cords that feel hot and using cords rated for the appliance in its extension-cord safety warning.
Adapters, old receptacles, and grounding checks
An adapter changes the shape of a connection; it does not necessarily create an equipment ground or increase circuit capacity. A three-to-two-prong adapter is not a ground unless its grounding means is correctly connected to a verified grounding point. Never attach a ground wire to a random screw or pipe, and do not remove a plug’s grounding pin to make it fit. ESFI recommends avoiding unsafe adapters and looking for recognized certification marks such as UL, CSA or Intertek.
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A three-slot receptacle is not proof that a ground is present. Older homes may have ungrounded receptacles, and a replacement with three slots can still be improperly wired. A GFCI can improve shock protection in some ungrounded situations, but it detects a current imbalance and interrupts power; it does not create an equipment-grounding conductor. Any solution must be selected and installed in line with the wiring and locally adopted electrical code. Grounding-type receptacles were first required for all 15- and 20-amp receptacle outlets in the 1971 National Electrical Code edition, according to ESFI’s outlet guide; current requirements depend on the jurisdiction and adopted code.
A plug-in receptacle tester can reveal some common wiring errors, but it cannot establish every aspect of safety or prove that wiring can carry a particular load. Klein Tools notes limitations for its RT600 receptacle tester, including that it cannot indicate ground quality or detect every combination of defects. If a receptacle is loose, burned, buzzing, or of uncertain grounding, use a qualified electrician rather than relying on a tester alone.
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Replacing a plug and reading its rating
Do not change an appliance’s grounding arrangement to make a replacement plug fit. A replacement must match the cord’s wire count and gauge, the appliance load, the plug rating, strain relief and intended use. A molded plug or damaged appliance cord is generally a repair or replacement job for a qualified professional unless the manufacturer provides a suitable repair procedure.
For example, Leviton identifies its 3W101 replacement grounding plug as NEMA 5-15P, rated 15 A and 125 V, with a two-pole, three-wire grounding design. Those ratings describe that product, not every household plug; check the appliance and replacement part markings and compatibility information.
In NEMA naming, “P” identifies the plug and “R” generally identifies the mating receptacle. “Two-pole, three-wire” means two current-carrying poles plus a grounding conductor, not three power phases. NEMA identifiers describe U.S. configurations, not a universal plug system.
Plug shapes differ outside the United States
This explanation concerns common U.S. household plugs and receptacles. Other countries use different blade shapes, grounding arrangements, voltages and frequencies. A travel adapter may change physical fit, but it does not necessarily convert voltage or frequency; check the appliance’s input rating and the destination’s electrical system before connecting it.
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