Erta Ale is a remote and rarely visited volcano that is known currently to have an active lava lake in its summit crater. Erta Ale has undergone seven eruption events in the past 125 years.
Re: What are the differences between Signal ground, Chasis ground and Earth?? Signal Ground is a reference point from which that signal is measured, due to the inevitable voltage drops when current flows within a circuit, some 'ground' points will be slightly different to others. There may be several signal grounds in a circuit.
System Grounding: The intentional connection of a. phase or neutral conductor to EARTH for the propose of. controlling the voltage to EARTH or GROUND within. predictable limits. It also provides for a flow of current that will. allow detection of an unwanted connection between system. conductors and ground which may instigate operation of.