This is the earth continuity conductor, which links the earth busbar in the consumer unit to the earth terminal provided by the supply company.
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The cabling to Earth is done for electrical conductivity, not for thermal conductivity. The general idea is to get rid of excess charges.
Radios. Switches. Cabling. Batteries. Rectifiers.
The two main types of electrical wire are made from copper and aluminium. The copper wires are used mostly in installations up to 3/0. The aluminium wires are used mostly on service entrances and feeders that need conductors above 3/0. This keeps the costs down when larger size conductors are needed.
At this point in technology. It would be Bulkier Cabling. Which means worse Air Flow and hotter temperatures. Slower Speeds
Blaniers Test is used in electronics to establish and locate short circuits and/or open circuits in cabling systems. It is a simple continuity test.