“I see answers below that indicate a 3 or 4 prong is required. Isn't the unit hardwired? Is the junction box required to be a metal box?”
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Cookingmama1, all requirements are listed in the installation guide. Other home electrical questions should be answered by your electrician. http://downloadcenter.samsung.com/content/EM/201702/20170203205359509/Install_NQ70M6650_NQ70M7770_AA_DE68-04454A-00_EN-MES-CFR.pdf ^Heath
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