Hi Joseph,

Internally I specified a 6 inch minimum contact length with the chain connected at both ends to the cart, but I don't remember any ESD standards that concurred with this.

If you have access, you might check ANSI/ESD S6.1-2005 Grounding.

ANSI/ESD S20.20 does not list a spec controlling grounding of mobile equipment but does list the resistance requirement.

It cannot just be in contact with, or hanging down to the floor, instead it must function constantly as the cart is moved.  If you break the connection to the grounded flooring, it will not work.

And don't forget the insulation problem that contamination such as dust will have on the chains so you have to include these in your audit program for equipment grounding verification.

Hope this helps,

Phil



Joseph Sokalski <[log in to unmask]> wrote:
Dear Technetters:

Has anyone seen a documented standard for the recommended drag chain length
attached to rolling carts? During a recent customer audit, I was cited for
insufficient chain contact with our ESD flooring. I looked in ANSI/ESD
S20.20-1999 and did not see any reference.

Any assistance would be appreciated.

Joseph Sokalski
Test Technology, Inc


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