Fix It Finder

Sub Panels Explained - Why are neutral and ground separated?

The Engineering Mindset · 2.7M views · 16:22

Skill Level

Pro Only

Permit Required

Yes

Tools Needed

voltage tester, multimeter, wire strippers, screwdrivers
⚠️This work typically requires a licensed professional in most jurisdictions.
Sub Panels Explained Get an exclusive Surfshark deal! Enter promo code ENGINEERINGMINDSET for an extra 3 months free at ➡️ https://surfshark.deals/engineeringmindset 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. 👉 👉👉 Electronics design software I use ➡️ https://www.altium.com/asp/the-engineering-mindset/ 🎁15% discount on multimeters.➡️ https://bit.ly/15-off-multimeters (use code EM15 at checkout) Learn more here: https://theengineeringmindset.com/sub-panel-explained/ ⚡🛠️ TOOLS YOU NEED 🛠️⚡ ******************************* Get this electronics book ➡️ https://amzn.to/41cCJPk Professional Multimeter -➡️ https://amzn.to/3xu2Vaw Good multimeter -➡️ https://amzn.to/3xrbuTd Professional clamp meter ➡️ https://amzn.to/4140FnK Good Clamp meter ➡️ https://amzn.to/3xqt2is Outlet tester ➡️- https://amzn.to/3kavg2l Energy monitoring plug ➡️ https://amzn.to/3SkfPl7 Battery tester -➡️ https://amzn.to/3S3fHWI Basic electronics ➡️ kit https://amzn.to/3xuLiqS 👋 SOCIALISE WITH US 👋 ******************************* 👉FACEBOOK: https://facebook.com/theengineeringmindset/ 👉TWITTER: https://twitter.com/TheEngMindset 👉INSTAGRAM: https://instagram.com/engineeringmindset/ 👉WEBSITE: Http://TheEngineeringMindset.com 👀 Links - MUST WATCH!! 👀 ******************************* ⚡ELECTRICAL ENGINEERING⚡ 👉How electricity works: https://youtu.be/mc979OhitAg 👉Three Phase Electricity: https://youtu.be/4oRT7PoXSS0 👉How Inverters work: https://youtu.be/ln9VZIL8rVs 👉How TRANSFORMER works: https://youtu.be/UchitHGF4n8 👉How 3 Phase electricity works: https://youtu.be/4oRT7PoXSS0 👉How Induction motor works: https://youtu.be/N7TZ4gm3aUg 👉What is a KWH: https://youtu.be/SMPhh8gT_1E 👉How induction motor works: https://youtu.be/N7TZ4gm3aUg ❄️ CHILLER ENGINEERING ❄️ 👉Chiller Efficiency improvements: https://youtu.be/8x3MiO5XjhY 👉Chilled water schematics: https://youtu.be/ak51DHAiuWo 👉Chiller crash course: https://youtu.be/K0xAKzdROEg 👉Chiller types: https://youtu.be/gYcNDT1d30k 👉Chillers/AHU/RTU: https://youtu.be/UmWWZdJR1hQ 👉Water cooled chiller Part1: https://youtu.be/0rzQhSXVq60 👉Water cooled chiller Part2: https://youtu.be/3ZpE3vCjNqM 👉Water cooled chiller advanced: https://youtu.be/QlKSGDgqGF0 👉Air cooled chiller: https://youtu.be/0R84hLprO5s 👉Absorption Chiller : https://youtu.be/Ic5a9E2ykjo 👉Chiller/Cooling tower/AHU: https://youtu.be/1cvFlBLo4u0 👉Chiller flow rate: https://youtu.be/tA1_V6-dThM 👉Chiller fault troubleshooting: https://youtu.be/Zu0LVVNNVSw 👉Chiller COP calculation: https://youtu.be/h5ILlZ8nyHE 👉Chiller cooling capacity calcs: https://youtu.be/BZxXIdxVKeY 👉Chiller compressors: https://youtu.be/7Bah__spkTY 👉Chiller expansion valve: https://youtu.be/dXiV5YzTZQ4 👉Chiller surge: https://youtu.be/DQK_-vxObiw 👉Chiller condenser: https://youtu.be/p5uuPsyqnwU 👉Chiller evaporator: https://youtu.be/W3w7FpX9j9k 👉Chiller compressor centrifugal: https://youtu.be/PT0UIqAGacg 👉Chiller cooling capacity: https://youtu.be/f-N4isgQRGQ 🌡️ HVAC ENGINEERING 🌡️ 👉HVAC Basics: https://youtu.be/klggop60vlM 👉Boilers/AHU/FCU: https://youtu.be/lDeuIQ4VeWk [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