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  1. harlista

    ESD Grounding

    Getting rather personal aren't we. lol I thought of the chain cleanliness so I cleaned it to no avail Then I tried a brand new much heavier chain in an attempt to get better contact with the floor. I think I'm going to have to face the fact that I cannot ground (yes, I mean in a static...
  2. harlista

    ESD Grounding

    IRstuff, I realize bonding all my carts components together does not yield zero ohms but for all intents and purposes it is essentially zero. I use a Desco 19784 Analog Surface Resistance tester and measure the new floor as 'dissipative' somewhere in the 10E6 to 10E9 region. The tester uses a 5...
  3. harlista

    ESD Grounding

    When I said "continuity" I meant a dead short. All the cart's components (with the sole exception of the wheels) and the drag chain are electrically shorted (zero ohms) to each other. I am trying to prevent ESD damage to parts and or boards being transported within the same ESD safe area. We do...
  4. harlista

    ESD Grounding

    I have an issue that is eluding me regarding ESD grounding of carts. We have metal carts in our facility that we use for material movement between work stations (and some workers use for storage). In our previous building we had a regular linoleum tile floor which had ESD wax applied once a...
  5. harlista

    Harmonic Distortion

    Good morning; I’m new to this forum and have a question for the collective. I work in a data center in Texas. We use two utility feeds entering our building, each side feeds a medium voltage switchgear unit which, in turn, feeds 4 delta-wye transformers (27KV in 480V out) per side. Two sets of...

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