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What is grounding and why do we ground the system and

electrical - Existing 3 wire service feed to sub panel
I know variations of this question have been asked (the closest I could find is here), but I'm still confused. @Tester101 explained if the existing feed to the subpanel is 3 wire with a grounded neutral and two hots and is not electrically connected to your main panel, your sub should have a bonded ground/neutral. Is this an acceptable way to ground the sub panel?
WHY THREE PRONGS? Electrical ground, stray voltage
The solution? Why, add a Third Prong! Connect this prong to the neutral side of the network, but do it only in one place in the circuit, and run a new third wire out to all of the wall-outlets. Give this wire a new color, one which is different from the other two.[PDF]
Grounding & Bonding — Why it is done And How to Install
Grounding is necessary to prevent fi res starting from a surface arc within the home. If the outdoor wiring supplying the home should be struck by lightning, proper grounding by the electrician directs that voltage into the earth where it dissipates. Because 250 of the Code requires the neutral conductor of a single-phase, 3-wire
Wiring an Outlet in the Middle of a Circuit
When an outlet receptacle falls in the middle of a circuit run rather than at the end, there are generally two cables in the outlet box. One cable is the incoming power source entering the box from one side, while a second cable exits the box to continue onward to "downstream" locations on the circuit.
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