Common rail (electricity)

For other uses, see Common rail (disambiguation).

In electrical engineering, a common rail (shortened to COM) is a shared path between different electrical routes in an electrical circuit. For example, a device or circuit board might have a power rail or a ground rail, which components are attached to, so all the electrical charge flowing through different components is drawn from/collected into a single conductor line. The ATX standard for PC power supplies defines a set of common rails as to ground the power, these rails are designated as COM and all have black wires.<ref>"ATX 24 pin power supply connector pinout diagram @". Pinouts.ru. 2013-08-24. Retrieved 2014-01-03.</ref>

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