The telecom symbol refers to an outlet that is used for devices such as a telephone computer data connection. Smoke detectors are commonly found in habitable rooms such as bedrooms, hallways and stairways. The smoke detector symbol describes a device that is used to detect smoke and sound an alarm. Wiring Diagram Symbols for Signals and Communications This listing of communication symbols and devices includes 120 volt, low voltage, alarm and signal devices. The listing includes a description of the commonly used devices that are represented by these communication symbols. When performing any electrical wiring for any of these communication devices, you will be able to identify the type and location of the various devices from this list of communication symbols. This list of communication symbols will help you to identify these devices on the electrical blueprint or wiring diagram layout.
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