What for?
1. To protect from power surge, or protect from malicous power attacks. If
power ground simply connects to building ground, voltage level isn't
gauranteed because malicious attack can easily change it's voltage level
and damage your whole building's equipments. For example they can use
a von de green device to connect to your building's backbone steel or
water resevoir to change the voltage level. Most building grounds are
connected to water reseviors.
2. Everyone needs this. Yes, there are lots of bad people who want to
make you slaves by wasting your money and making you poor. This can be
achieved via ground voltage manipulation and sabotage. Everyone needs this.
3. Offset ground so that both output and ground can be shifted the same
time, maintaining a fix voltage difference.
Scehmatics
Next steps:
1. Try it on edx? To protect a light bolb? What transistor?
2. Is it the same as UPS? No. They have different purposes. UPS stores
the high voltages and provides them during a blackout. Some UPS stabilize
the high voltages but not the ground. So they are not a protective device
for ground voltage.
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