# Corrosion at main panel lugs

**URL:** <https://forum.nachi.org/t/corrosion-at-main-panel-lugs/219725>\
**Category:** Misc. Discussion\
**Created:** [September 12, 2022, 4:05pm UTC](https://forum.nachi.org/t/corrosion-at-main-panel-lugs/219725 "2022-09-12T16:05:01Z")\
**Posts on this page:** 5\
**Page:** 1

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**Author:** ![tvogt2](https://sea2.discourse-cdn.com/internachi/user_avatar/forum.nachi.org/tvogt2/32/223285_2.png) [@tvogt2](https://forum.nachi.org/u/tvogt2)\
**Post date:** [September 12, 2022, 4:05pm UTC](https://forum.nachi.org/t/corrosion-at-main-panel-lugs/219725/1 "2022-09-12T16:05:01Z")

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There is corrosion at the exterior main panel lugs/bar.

In my second year of inspections and have yet to see this.

Assuming it’s from moisture getting into panel. Planning to recommend lic electrician evaluate before close.

Any other tips, explanations, comments are welcomed.

TIA

 ![image](https://global.discourse-cdn.com/internachi/original/4X/7/5/f/75f0664e5555bcb500d33915ebdeda92f218fded.jpeg)

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**Author:** ![jjonas](https://sea2.discourse-cdn.com/internachi/user_avatar/forum.nachi.org/jjonas/32/301755_2.png) [@jjonas](https://forum.nachi.org/u/jjonas)\
**Post date:** [September 12, 2022, 4:40pm UTC](https://forum.nachi.org/t/corrosion-at-main-panel-lugs/219725/2 "2022-09-12T16:40:21Z")

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> [@tvogt2](#):
>
> Assuming it’s from moisture getting into panel. Planning to recommend **lic electrician evaluate** before close.

… **AND REPAIR AS NECESSARY**!!

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**Author:** ![tvogt2](https://sea2.discourse-cdn.com/internachi/user_avatar/forum.nachi.org/tvogt2/32/223285_2.png) [@tvogt2](https://forum.nachi.org/u/tvogt2)\
**Post date:** [September 12, 2022, 4:48pm UTC](https://forum.nachi.org/t/corrosion-at-main-panel-lugs/219725/3 "2022-09-12T16:48:17Z")

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Yessir, thank you.

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**Author:** ![kleonard](https://sea2.discourse-cdn.com/internachi/user_avatar/forum.nachi.org/kleonard/32/170953_2.png) [@kleonard](https://forum.nachi.org/u/kleonard)\
**Post date:** [September 12, 2022, 4:52pm UTC](https://forum.nachi.org/t/corrosion-at-main-panel-lugs/219725/4 "2022-09-12T16:52:54Z")

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[Galvanic corrosion - Wikipedia](https://en.wikipedia.org/wiki/Galvanic_corrosion)

As Jeff stated above, it’s a defect that should be addressed.

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**Author:** ![mgoldenberg](https://sea2.discourse-cdn.com/internachi/user_avatar/forum.nachi.org/mgoldenberg/32/89265_2.png) [@mgoldenberg](https://forum.nachi.org/u/mgoldenberg)\
**Post date:** [September 12, 2022, 5:37pm UTC](https://forum.nachi.org/t/corrosion-at-main-panel-lugs/219725/5 "2022-09-12T17:37:02Z")

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Moisture that enters a circuit breaker panel can corrode electrical  
wiring, connections, circuit breakers and even rust the bottom and  
inside of the panel box.  
Deterioration, rust, and corrosion in an electrical connection create  
extra resistance to electricity flow, and consequently heat.  
In severe cases, electrical arcing and excess heating can occur inside the  
panel causing a fire hazard.  
No approved method exists for removing/cleaning corrosion or  
contaminants from panel interiors or components such as bus or  
terminal bars, circuit breakers or fuses.  
The panel and/or components inside may need replacing.