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Shelter in place. Shelter in place (also known as a Shelter In-Place Warning SAME code: SPW) is to seek safety within the building you already occupy, rather than to evacuate the area or seek a community emergency shelter.
Chassis ground is meant to protect people from shocks. It is a protective ground which is connected to the earth ground. Earth ground is a metal rod really dug deep in ground outside the building to sink current and provide ground zero. Signal ground need not be connected to this, Signal ground is a common return path for the signal.