Right.

It's ANSI/ESD S20.20 Paragraph 6.2.3.2. Protected Areas Guidance "All
process essential insulators that have electrostatic fields that exceed
2,000 volts should be kept at a minimum distance of 12 inches from ESDS
items."

Clothing made from synthetic fabrics is typically insulative and high
charging.  ESD Garments should be worn with the front properly snapped or
buttoned to avoid exposure of possible charges on personal clothing worn
under the garment.  Although ESD Smocks are not a S20.20 requirement, it's
a very effective means to comply with paragraph 6.2.3.2's recommendation.

Per ESD Handbook TR 20.20 paragraph 5.3.13.1 "While a person may be
grounded using a wrist strap or other grounding methods, that does not mean
that insulative clothing fabrics can dissipate a charge to that person's
skin and then to ground. Clothing usually is electrically separate or
isolated from the body."

Note: an ESD Smock is a conductor and should therefore be grounded.
Per ESD Handbook TR 20.20 paragraph 5.3.13.2.6 "After verifying that the
garment has electrical conductivity through all panels, the garment should
be electrically bonded to the grounding system of the wearer so as not to
act as a floating [conductor]."


Gene Felder
[log in to unmask]


-----Original Message-----
From:   Larry Frasier [SMTP:[log in to unmask]]
Sent:   Thursday, July 25, 2002 12:06 PM
To:     [log in to unmask]
Subject:        Re: [TN] ESD Smock Length

I think you will not find a specific standard dealing with Length of
Smocks, but.... there is a section which discusses distances that esd
generating devices should be when working at a station.  It discusses the
distance of esds component from a static generating device (creating
greater than 2000 volts).  I believe that distance is 12 inches.

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