Q. What is the general rule that limits the use of flexible cords for the connection of appliances?
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A. Flexible cords are permitted to facilitate frequent interchange, or to prevent the transmission of noise and vibration [400.7(A)(6) and 400.7(A)(7)] (2)] and to facilitate the removal of appliances fastened in place, where the fastening means and mechanical connections are specifically designed to permit ready removal [400.8(A)(8) and 422.16(A)].
Flexible cords must not be used for the connection of water heaters, furnaces, and other appliances fastened in place, unless the appliances are specifically identified to be used with a flexible cord.