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But you can't guarantee at any isolated system that will remain isolated to the earth, here connection to the earth we treat as fault...

Why my diagram from post #15 without earth electrodes 1 and 2 is not isolated system?

Yes now part of current will travel through one person through earth to other person. RCD will not trip. Breaker will not cut power...

Isn't definition of isolated electric system, system that is not connected to Earth? How do you mean in contact with earth? Devices...

@sophiecentaur Can you expalin "If we get an earth fault at D (not simultaneous with C above) then we have the same situation with...

@tech99 , @Averagesupernova Do you understand and agree with Transistor answer? Why his isolated system can't use RCD to fix the...

No, maybe someone can put a link.

Why is grounded electrical system safer than isolated system?

But why we even need ground reference, if we have PE wire that return current back to transofrmer in case of fault? We have PE wire just...

Does house need PE wire connect to earth in garden, if yes why?

What mean grounding, connect pipe to ground wire(green or green-yellow wire) that coming from transformer or connect to Planet earth...

Both the main electrical cable (three-phase, line to neutral=230V, line to line =400V, 50Hz) and the water supply line(ppr pipe) are...

Why is vector r a/p (lever arm) not perpendicular to force F? moment of point P must be: Mp= lever arm perpendicular to force F x force F

Net force=zero case: F1=10, F2=40, N=50 Moment at A=-10x2+40x1=+20Nm Moment at B= 10x2-50x4+40x5=+20Nm Net force = non zero: F1=10...

Why as long net force= zero, moment at any point is the same but if net force= non zero, that is not case anymore? Here is simple...