Neutral. What is the importance of neutral?

Where do we have Neutral: AC or DC circuit? What is the normal size of neutral: AWG? How about AWG size of ground wire? What is the importance of neutral-ground bonding? In which part of the circuit do we have Neutral-Ground bonding? How does Neutral-ground bonding affect the circuit? What will happen of we... show more Where do we have Neutral: AC or DC circuit?
What is the normal size of neutral: AWG?
How about AWG size of ground wire?
What is the importance of neutral-ground bonding?
In which part of the circuit do we have Neutral-Ground bonding?
How does Neutral-ground bonding affect the circuit? What will happen of we don't have it?
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