Please defend yourself. We can’t even verify that you even know what we are talking about.
This is what I was explaining in my previous posts. I have had a couple of fire alarm control panels that I powered up with no Earth connection, and I have never received a trouble. Not all systems even have ground. It will display the Earth fault trouble once something is shorting, and the control panel chassis receives the shock. For example, the Fire-Lite MS-2 has you connect the ground wire to the panel chassis, and to the Earth terminal. The reason for connecting the wire to the Earth terminal is so the panel can detect electricity flowing threw the panel (in case there is a fault in the Earth wire going to the power panel’s ground bus). Even if you do not have an Earth connection, you should still have a wire going from the panel’s chassis to the Earth terminal.