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This type of receptacle is not for use with standard appliances but rather is reserved for such items as power tools, which often require a dedicated circuit because of their energy requirements.
Unlike standard three-prong outlets, which have a neutral and a hot slot in addition to the arch-shaped grounding slot, a 240-volt receptacle has two hot slots in addition to the grounding slot.
The unique design of the outlet allows you to easily match it up to the plug of the power tool, not only ensuring that amperage requirements are met but also offering the additional safety feature of preventing you from accidentally plugging any other appliance into it.
240-volt receptacles come in styles that can be mounted directly onto a surface or recessed into a wall. For added safety, you might consider an industrial model, which has a feature that locks the plug in the slot. This is particularly useful for large or very heavy power tools.
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This type of receptacle is not for use with standard appliances but rather is reserved for such items as power tools, which often require a dedicated circuit because of their energy requirements.