Why need a grounding system in new factory, office or home . Can without grounding electricity not work properly?

Electrical ground system: Why We Need Electrical System Grounds, Ground Wiring, Grounding Conductors, Grounding Electrodes (http://inspectapedia.com/electric/Electrical_Ground_Required.php)


Grounding, Electrical - HowStuffWorks (http://science.howstuffworks.com/electrical-grounding-info.htm)

Absolutely not!

An AC house system can work without a ground. For a number of years, houses did not have grounding wires, only a 2 wire system. Starting in the 50's, code was changed to include this important feature. A ground is a safety item. Let's say you have a bare 120VAC wire sitting on an ungrounded metal case, a washer. When you touch the case, you become the ground and the voltage and amperage will flow through you, possibly killing you. An automobile, on the other hand will not operate without a ground as it is DC.