Sub Panels Explained - Why are neutral and ground separated?
The Engineering Mindset · 2.7M views · 16:22
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voltage tester, multimeter, wire strippers, screwdrivers⚠️This work typically requires a licensed professional in most jurisdictions.
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How do sub panels work, how are sub panels wired, why are neutral and ground separated, what happens during a ground fault, what happens when we lose a neutral wire, what happens if the sub panels is incorrectly wired. All this and so much more covered in this video.
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[0:00] Why Neutral and Ground Are Separated in a Subpanel
[0:06] When Do You Need a Subpanel?
[0:14] What an Electrical Panel Does
[0:25] Why Install a Subpanel?
[1:06] How Residential Power Gets to Your Home
[1:27] Service Drop and Utility Transformer Explained
[1:54] How the Electrical Meter Works
[2:31] Main Panel Wiring Scenarios Explained
[2:53] Main Breaker and Main Disconnect Explained
[3:36] How the Main Breaker Feeds the Bus Bars
[4:18] Branch Circuits Explained
[4:38] How Circuit Breakers Connect to Bus Bars
[5:00] Hot, Neutral and Ground Wire Paths Explained
[5:30] Why Homes Have 120V and 240V
[5:47] Grounding Electrode Conductor Explained
[6:05] Main Bonding Jumper Explained
[6:23] Why Scenario 3 Uses Separate Neutral and Ground Bars
[6:57] How an External Disconnect Changes Main Panel Wiring
[8:48] What a Subpanel Is
[9:01] How a Subpanel Is Fed from the Main Panel
[9:23] Main Lug Subpanel Explained
[9:40] Feeder Wires Explained
[10:09] When a Subpanel Needs a Grounding Electrode
[10:29] How Loads Connect in a Subpanel
[10:49] Why Neutral and Ground Must Be Separated in a Subpanel
[11:09] Normal Current Path in a Subpanel
[11:44] Ground Fault Current Path Explained
[12:13] Why Neutral and Ground Must Bond at the Main Disconnect
[12:26] What Happens If Neutral and Ground Are Never Bonded
[12:57] What Happens If You Bond Neutral and Ground in a Subpanel
[13:48] Why Parallel Neutral-Ground Paths Are Dangerous
[14:10] What Happens If the Service Neutral Is Lost
[14:56] Ground Fault with an Open Service Neutral Explained
[15:37] Why You Need a GFCI
[15:42] How a Ground Fault Circuit Interrupter Works