This is what ESD TR20.20 - Handbook has to say about Static Protective
Seating.

Although not required in S20.20 as a primary means of grounding personnel in
the workplace, the use of chairs that meet resistive requirements from the
seat contact surface to the castors or leg ends, may be an effective means
of grounding personnel . . .
if the chair is used to connect personnel to ground . . . maximum resistance
to ground from the person through the chair and flooring system should be
less than 35 megohms.

Criteria for evaluating the electrical resistance of static protective
seating can be found in ESD-STM 12.1.



-----Original Message-----
From: TechNet [mailto:[log in to unmask]]On Behalf Of Joseph Sokalski
Sent: Friday, September 16, 2005 2:36 PM
To: [log in to unmask]
Subject: [TN] ESD Drag Chain Length


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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