Earthed to the Ground was created in 1984-05.
The cable sheathing is earthed as a protection method in case of single-line-to-ground, double line-to-ground or three phase faults. This prevents damage to plant and personnel.
There is no need to. The manufacturer designed the appliance for the specification of not needing a ground to be connected to it.
yes
A DC motor is typically not earthed to prevent ground loops and minimize interference with the motor's operation. Earthing could create unwanted return paths for current, potentially leading to erratic performance or damage. Additionally, many DC motors are designed with insulated windings, which means they do not require a ground connection for safe operation. Instead, they rely on proper insulation and design to ensure safety and functionality.
no
no
Nominal transmission and distribution voltages are line voltages. So '66 kV' is a line-to-line voltage. Note that there is no such thing as a 'phase-to-phase' voltage -the correct term is 'line-to-line'. Using the term, 'phase-to-phase', indicates a lack of understanding of a.c., which is not uncommon! Incidentally, the symbol is 'kV', not 'KV'.
Front wheel bearings in a car should be well greased but have never heard of them needing to be earthed.
To the Ground was created in 2007-12.
No.
Shallow Ground was created in 2005.
Clan Ground was created in 1984.