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| ESD mats - when is grounding not required? |
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| tkamiya:
Concrete itself is somewhat conducting. Rebar inside is grounded at some point. So if it is painted with a proper conductive paint, it is grounded,. |
| wraper:
--- Quote from: tkamiya on May 29, 2020, 09:07:52 pm ---Concrete itself is somewhat conducting. Rebar inside is grounded at some point. So if it is painted with a proper conductive paint, it is grounded,. --- End quote --- It's at potential you can only guess about and might not be the same as any equipment and other things connected to mains earth. The fact is, it might work OK but does not adhere to any standards and you might get screwed over legally/ losing customers say when business partner finds out or by physically damaging things. |
| thm_w:
--- Quote from: tkamiya on May 29, 2020, 09:07:52 pm ---Concrete itself is somewhat conducting. Rebar inside is grounded at some point. So if it is painted with a proper conductive paint, it is grounded,. --- End quote --- Probably, but thats not what the spec requires. Perhaps you can make that argument if you tie directly to the rebar. |
| SparkyFX:
--- Quote from: steaky1212 on May 28, 2020, 10:41:02 am ---Is there a case that can be made, that says that if the matting is large enough then a connection to ground is not required? I could probably use a flash tester to measure the resistance, but we are all in lockdown so it's very difficult for me to perform any sort of testing. --- End quote --- Testing is the best way to settle the discussion. In my opinion both points of view have something to it, as in this is not an "either - or" question, but which effect dominates. But without grounding the floor mats the actual conductivity might depend on humidity and temperature in a way that might exceed acceptable limits. That might also influence how or when to test. |
| tkamiya:
Use of rebar as electrical ground is called "reefer ground" and is approved by NEC. It's perfectly legal substitute for ground rods. Now, just painting anti-static paint on that is approved or not, I have no idea. |
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