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Unbonding Neutral in Subpanels (Green Screw Removal)

5:29
9:31
5.2K views

At 5:29 in

MASTER ELECTRICIAN DAD TEACHES HIS SON HOW TO INSTALL A SUB PANEL!

What happens here

The presenter reiterates the critical difference between main panels and subpanels regarding bonding. He shows a diagram illustrating that the neutral bus bar in a subpanel must NOT be bonded to the panel case. If a green bonding screw (which is designed to bond neutral and ground in a main panel) is present in a subpanel, it MUST be removed. This ensures the complete separation of neutral and ground, which is essential for safety and compliance in a subpanel setup.

Goal: Ensure proper unbonding of neutral and ground in a subpanel

Tools and materials

  • Green Bonding Screw — Bonding neutral and ground in main panels, must be removed for subpanels
  • Screwdriver — Removing the green bonding screw
  • Subpanel Neutral Bus Bar — The bus bar that must remain unbonded from ground

What they say

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panel. Yes. Absolutely. Definitely. Now, normally what would happen is you'd come and all the wires would just be hanging. Yeah. So, you want to mount your panel, make all your knockouts, dress your wires in, you know, cut off all the ROMX jackets, discard that, separate your neutrals, separate your grounds, cuz even if you put them all in the same spot, as far as, you know, if the neutrals and grounds are together, they're not bonded. Yeah. Uh it's always nice to have them bundled together, right? Okay. I see. The other thing is you have to make sure there's no bonding screw. So, a lot of times there'll be a screw right here. What color is It's usually the green screw, right? It's usually green. You can put it right here. Sometimes it's on the actual bus bar. Mhm. Uh but in this case, it's a big screw. So, if I wanted this to be a standard sub panel for like uh you know, directly next to my main, make sure that that screw is out. Right. Yeah. You know, if this becomes the main, I have to put this in. I have to bond the the ground and the neutral together. Got it. That makes sense because then you can convert this to a main panel or a sub panel. Correct. So that's why that green screw is not present here. Make sure that that's out. I see. And it has to be a green screw. You know, you can't just use a tech screw or quarter20 screw. It has to be a green screw. Mhm. So sometimes you could use a Sharpie. A Sharpie some looks like green sometimes. Yeah. on a regular screw head if you need to do that. Nice. Nice. All right. So, what I need now is some two- pole

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