Class C Grounding

Sparky2791

Sparky2791

Senior Member
Location
Northeast, PA
Occupation
Electrical Design
Hello -

Preparing a drawing for the EC to hook up this piece of manufacturing equipment and the manufactures information listed this....

1733403920625.png

The machine is from overseas. Not sure which country.
Trying to determine any specifics as to what makes it class C grounding.
Are they seeking a separate ground rod(s)driven at the equipment for this to meet the 10 Ohms or less? We are pouring a new slab where the machine will be located which will have new re-bar doweled into the existing slab but new rebar will not be tied to the existing so ultimately not part of the GES of the building.

I looked up Class C grounding and it talks about grounding for 300V and below and so far on the equipment info we were given I do not see the voltage of it listed. In my experience these are typically 480V 3 phase.

Could go 'down a rabbit hole' on the web but thought I would start here and tap into the vast knowledge this site has.

Thanks for the replies!
 
Only the manufacturer can tell you what that means. They could be asking for an auxiliary electrode.
 
infinity said:
Only the manufacturer can tell you what that means. They could be asking for an auxiliary electrode.
Click to expand...
You may be right. Continued looking over the drawings they sent and found this (Transformer) which could explain the 300V and below I read about regarding Class C grounding . If that is the case tying into the building steel (GES) would work although I am not sure if that would get 10 ohms or less. They show what wire size to use (although metric) A wiring diagram of the machine would be nice. We are reaching out to the manufacturer.

1733405746885.png
 
Sparky2791 said:
Continued looking over the drawings they sent and found this (Transformer) which could explain the 300V and below I read about regarding Class C grounding . If that is the case tying into the building steel (GES) would work although I am not sure if that would get 10 ohms or less.
Click to expand...
Since there is a transformer involved it could be a GEC to the building GES like a standard US installation.
 
infinity said:
Since there is a transformer involved it could be a GEC to the building GES like a standard US installation.
Click to expand...
I agree but adding that into the instructions really messes with our heads. Might be some grounding requirement in the country where it is made. Also I was incorrect in my previous posts. The 300V & below was indicated incorrectly. After reading about this again that has to do with GFCI's a Class C GFCI applies to circuits 300V to ground, so basically a 277V circuit and appears to have nothing to do with this.
 
Where is this made? I believe that Germany has a Class C grounding requirement for the neutral of a SDS.
 
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