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Grounding transformer case?

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J

jerkbag

Member
Joined 2010
#1
Hi all -- I remember this being mentioned somewhere but now I can't seem to find it. As I am finishing my SE build, should I be sanding my transformers at the contact points with the chassis to create a safety ground?


The chassis is anodized aluminum so I plan and sanding a spot and using a star washer for a chassis ground, but can't remember if I need to do anything special with the transformers.



Thanks!
 
#2
I asked the same question when I mounted my SSE transformers.

I was told to use Kep Nuts, or star washers. These will dig in and make contact with the metal. So, that's how I mounted mine. I measured less than 1 Ohm resistance at every point.
 

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#3
Thanks! I'm still a little confused if I need to worry about grounding the case of the transformer itself? It's an Edcor, and is painted with something non-conductive.



Right now I have sanded a patch on the underside of the anodized aluminum and used the star washer. I have good connection with that point on the chassis, but the outside of the transformer itself doesn't have a ground connection (non-conductive).
 
#4
If you are worried about it sand the paint off one foot of the underside of the transformer.


Use a star washer on the topside of the grounding bolt. The teeth should dig into the paint and ground the transformer.
the first method is the preferred method
 
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#6
Star washers work great and you're right - the powder coat is non-conductive but George correctly points out that if you ever have a short or issue with transformer and there is bare metal ungrounded you have exposed B+ waiting for you.

Not something to take lightly. Scraping some paint or the star washers are cheap insurance.
 
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