Neutral Bar vs Ground Bar: What Each One Does in Your Panel
Updated 2026-09-30 · 6 min read
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Every residential panel has two kinds of terminal bar. They look alike and do different jobs.
Short answer: the neutral bar terminates the white grounded conductors, which carry return current every time a 120 V load runs. The ground bar terminates bare or green equipment grounding conductors, which carry current only during a fault. In the panel that serves as your service disconnect the two are bonded together on purpose; in every panel downstream of it they must stay separate.
What does the neutral bar do?
The neutral bar is the landing point for each circuit's grounded conductor, the NEC's term for the neutral. Those conductors are normally white or gray (NEC 200.6).
On a 120 V circuit, current leaves on the hot conductor and comes back on the neutral, so the neutral is a current-carrying conductor in normal operation. The bar collects those returns and ties them to the service neutral, which runs back to the grounded center tap of the utility transformer.
What does the ground bar do?
The ground bar terminates equipment grounding conductors: bare copper, or insulation that is green or green with yellow stripes (NEC 250.119). They connect the metal parts of every circuit, including receptacle ground slots, appliance frames and metal boxes.
They carry nothing in normal operation. Their job is to give fault current a low-impedance path back to the source, so that when a hot conductor touches a metal case, enough current flows to trip the breaker fast. The principle is covered in grounding vs bonding.
How do you tell them apart?
Manufacturers differ, so treat this as the general pattern rather than a description of your specific panel:
| Neutral bar | Ground bar | |
|---|---|---|
| What lands on it | White or gray neutrals, plus the service neutral in a service panel | Bare or green grounds |
| Current in normal use | Yes, whenever 120 V loads run | None; fault current only |
| Mounting | Usually on an insulating base, so it can be isolated from the enclosure | Usually screwed directly to the metal enclosure |
| Bonding hardware | A place for a green bonding screw or bonding strap to the enclosure | None needed; its mounting bonds it |
| Supplied with the panel? | Yes | Sometimes; often a separate accessory kit |
The giveaway is the bonding screw or strap. NEC 250.28 requires a screw-type main bonding jumper to have a green finish that stays visible once installed, which is where the "look for the green screw" rule of thumb comes from. Many load centers also have two neutral bars, one on each side, tied together by a crossbar.
That's what an electrician or inspector sees with the inner cover off. Don't remove it yourself; the safety section below explains why.
Why are the neutral and ground bars connected in a main panel?
At the service disconnect, the main-breaker panel in most houses, the NEC requires a main bonding jumper connecting the grounded conductor to the equipment grounding conductors and the enclosure (NEC 250.24(B), with construction and sizing in 250.28). The green screw or strap is that jumper.
That one connection closes the fault loop. Fault current travels from a metal appliance case back over the equipment grounding conductor, crosses the bond, and returns to the transformer on the service neutral. Without it, a ground fault might never draw enough current to trip anything.
Because the bars are bonded there, they're electrically the same point in that one panel. NEC 250.142(A) permits the grounded conductor to serve as the grounding connection on the supply side of, and within the enclosure of, the service disconnect. That's why the two bars can share duties in a main panel and nowhere else.
Why do they have to be separate downstream?
Downstream of the service disconnect, the NEC prohibits connecting the neutral to grounding conductors or enclosures (NEC 250.24(A)(5) and 250.142(B)). A second bond would split everyday return current between the neutral and the grounding path, putting current on metal you can touch. The full rules for a panel fed from another panel are in subpanel grounding and neutral separation.
One case catches people out. If your house has an outdoor service disconnect or meter-main ahead of the indoor panel, the bond is made in that outdoor equipment, and the indoor "main panel" is downstream of it, so its neutrals and grounds stay apart. See what is a service disconnect.
How many wires can go under one screw?
The two bars follow different terminal rules.
Neutrals: one per terminal. NEC 408.41 requires each grounded conductor to terminate in an individual terminal that is not used for another conductor. Its exceptions are narrow and rarely apply to ordinary house circuits. The practical reason: if two neutrals share a screw, loosening it to work on one circuit also disconnects the other circuit's neutral, which may still be carrying current.
Grounds: sometimes shared. A terminal that takes more than one conductor must be identified for it (NEC 110.14(A)). Many panel labels permit a small number of equipment grounding conductors, within a stated size range, under one screw. If the label doesn't say so, it's one per terminal.
Never a neutral and a ground together. That breaks 408.41 whatever the label allows for grounds.
Breaker terminals follow the same listing logic; see double-tapped breakers.
Can grounds go on the neutral bar in a main panel?
Generally yes, where the panel is the service equipment and the bars are bonded, subject to the panel's label. NEC 408.40 does not allow equipment grounding conductors on a bar provided for neutrals unless the bar is identified for the purpose and sits where a neutral-to-ground connection is permitted. Residential service panels are commonly labeled to allow it, and the label states how many grounds may share a terminal and in what sizes. Follow it (NEC 110.3(B)).
It doesn't work in reverse. Neutrals belong on the neutral bar, not on an accessory ground bar. Those kits are intended for equipment grounding conductors, and a neutral landed on one sends normal return current through the enclosure metal to reach the bond.
Adding a ground bar
Some panels ship with neutral bars only, or end up with too few ground terminals for the circuits they serve. The answer is an accessory ground bar kit, and it should be the one the panel label or manufacturer lists for that enclosure, mounted where the instructions show. A generic bar fastened wherever it fits is outside the listing the panel was tested to (NEC 110.3(B)).
Why is this electrician work?
Everything in this guide sits behind the dead-front, the inner cover the breaker handles poke through. Removing it exposes the service conductors and main lugs on the line side of the main breaker, and those stay energized with the main breaker off. There is no overcurrent device of yours between them and the utility transformer, which is why homeowners shouldn't open it, even just to look.
What you can safely learn from the outer door is covered in how to read your electrical panel; what's on which bar is a question for a licensed electrician. See also electrical work homeowners can legally do.
The part of this system you might handle is the far end: the white neutral and bare ground in an outlet or switch box, which run back to these bars. Where your jurisdiction allows that device work, turn the breaker off and confirm the box is dead with a non-contact voltage tester, proving it on a known-live circuit before and after, and leave the panel's dead-front on.
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Standards and code reference
The standards behind this guide, for looking up in the edition your jurisdiction has adopted:
- NEC 200.6: identification of grounded (neutral) conductors, white or gray
- NEC 250.119: identification of equipment grounding conductors, bare, green, or green with yellow stripes
- NEC 250.24(B): main bonding jumper required at the service disconnect
- NEC 250.28: main bonding jumper material, construction (including the green screw) and size
- NEC 250.24(A)(5): no neutral-to-ground connection on the load side of the service disconnect
- NEC 250.142(A) and (B): where the grounded conductor may, and may not, be used to ground equipment
- NEC 408.40: equipment grounding conductor terminals in panelboards; grounds on a neutral bar only where identified and permitted
- NEC 408.41: each grounded conductor in its own terminal
- NEC 110.14(A): terminals for more than one conductor must be identified for it
- NEC 110.3(B): install equipment according to its listing and labeling
Code editions and local amendments vary. Confirm the adopted edition with your AHJ, and treat manufacturer instructions as governing wherever they are more restrictive.
Where to go next
- What is an electrical panel?
- Main breaker vs main lug
- What is a bootleg ground?
- Generator neutral bonding
More in our electrical panel guides.
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