Common and inter-system ground noises

In this entry we will talk about ground noises. First of all, what is ground? As a simple way to tell it is the 3rd line when you have a single-phase wiring. 2 lines are connected to your electricity system(ups, generator or city lines) Ok, then why are we connecting a 3rd line? As an unwanted situation, there is a disturbance between the power neutral(generally, blue or white wire) and the gorunding conductor(should be green). These disturbances exist as a result of noise injection into the neutral or grounding wires, wiring faults or overloaded power circuits. One common mistake is while your electrician cabling your system, he can use inappropriate neutral cable size. This also leads to electricity flow to return from ground.
However, Inter-system ground noise is different than common ground noise. Assume that you have two ups systems. First group is grounded by your IT team and the second system is grounded by your building system. When there is a difference in the ground noise between these systems, computers are impacted when they are connected to these different systems. It is also possible to pass noise from high ground noise to lower one with data cables. This situation is known as inter-connect ground noises.
The best way to stop these, all systems should be connected one ground system and connected systems will also have no problem within one ground loop. Additional systems grounding should be added as a tree structure.