- An electrical outlet, which in addition to the current-carrying contacts, has a third contact which serves for connection to a grounding conductor. Devices and equipment which are to benefit from this safety feature must have an appropriate three-prong plug which is inserted into this outlet. Its abbreviation is 3-prong outlet. Also called three-prong electrical outlet, grounding outlet, grounding receptacle, or safety outlet.
- abbreviation 3-prong outlet
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