How To Look At A House
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Can NM-cable (Romex®) be used to make a cord and plug to connect an appliance?
Wednesday, July 4, 2018
The answer is no, and the principle behind it is simple: the electrical cords that manufacturers use for appliances, like the one shown above, have multiple strands in each wire that will flex repeatedly without breaking, but an NM-cable wire has a single, solid conductor that is only rated for use in a permanently installed branch circuit that is not moved once it is in place.
We occasionally see NM-cable used for a cord and plug to connect a water heater, disposal, or dishwasher. While it could be argued that these are not appliances like a vacuum cleaner that are frequently plugged and unplugged, NM-cable is just not rated for this use. Also, NM-cables are required to be secured and protected from damage by National Electrical Code (NEC), while cords are not.
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Here’s links to a collection of our other blog posts about ELECTRICAL WIRING:
• Which house appliances need a dedicated electrical circuit?
• Can a short circuit cause a high electric bill?
• What is the maximum spacing requirement for securing NM-cable (nonmetallic-sheathed cable)?
• Is it alright to just put wire nuts on the end of unused or abandoned NM-cable or wiring?
• What causes copper wires to turn green or black in an electric panel?
• What are typical aluminum service entrance wire/cable sizes for the electrical service to a house?
• Why is it unsafe to bond neutral and ground wiring at subpanels?
• Should I get a lightning rod system to protect my house?
• Why is a strain relief clamp necessary for the cord connection to some electric appliances?
• Does a wire nut connection need to be wrapped with electrical tape?
• What is the minimum clearance of overhead electric service drop wires above a house roof?
• What are the requirements for NM-cables entering an electric panel box?
• What is the color code for NM cable (Romex®) sheathing?
• Why is undersize electric wiring in a house dangerous?
• What causes flickering or blinking lights in a house?
• Why are old electrical components not always "grandfathered" as acceptable by home inspectors?
• How can I find out the size of the electric service to a house?
• Can old electrical wiring go bad inside a wall?
• What is an open electrical splice?
• What are the most common electrical defects found in a home inspection?
• What is the life expectancy of electrical wiring in a house?
• What is an "open junction box"?
• How dangerous is old electrical wiring?
• I heard that aluminum wiring is bad. How do you check for aluminum wiring?
• What is "knob and tube" wiring?
• What is the code requirement for receptacle outlets in a closet?
Visit our ELECTRICAL page for other related blog posts on this subject, or go to the INDEX for a complete listing of all our articles.
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