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Romex is flexible, heat & fire resistant, easy to install, and relatively inexpensive.
Romex is by far the most common type of wire used in single-family residential applications today, and been used extensively for the past 40 years. The wire is protected by 2 layers of insulation, with each individual conductor being insulated and the entire bundle also being insulated.
It resists puncture by nails and screws, and, as I will describe later, is more resistant to being chewed through by rodents and other pests than Romex and knob and tube.
BX is as good as Romex from a Magnetic Field (MF) standpoint, but has the added benefit of shielding Electric Fields (EF).
In this article I will explain current options and residential wiring best practices.