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June 2000

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Subject:
From:
Gary Camac <[log in to unmask]>
Reply To:
TechNet E-Mail Forum.
Date:
Wed, 14 Jun 2000 15:55:02 -0500
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...and according to ANSI/ESD-S20.20-1999 you are required to have:

Equipment Ground
Common Point Ground
Wrist Strap System - on seated operations
Signs
ESDS Item packaging
You must have an ESD Control Program Plan
You must do training (initial and recurrent)

I see no requirements for wearing smocks, heal straps, conductive footwear, area
ionization, conductive seats .... These are considered optional elements.

Am I missing something here?  The subject of open or closed smocks has been passed around
a lot in the last couple of months.  And overtime someone stands up and says, " ya but,
all the studies say that the wrist strap is all you really need.  Are the smock guys just
wearing a belt and suspenders, i.e., being cautious?

I can see that if you have a multifaceted attack, you have room for one element to fail
and still have back-up.  But where do you stop?

Gary Camac

Paul Signorelli wrote:

> ESD Protection has 2 elements and BOTH must be satisfied:
>
> First is the 'Objective' evidence; e.g.: The static field
> from a person who doesn't have his top button snapped
> maybe xx volts and totally acceptable.
>
> Second is the 'Subjective' appearance (Feelings - No data);
> e.g.: Even though the field meter says the smock is protecting the ESD
> sensitive item, the auditor doesn't consider that because he just
> doesn't like it or because the procedure doesn't allow it.
> You have to be very careful when writing your ESD
> procedures.
> Check out the new ANSI/ESD-S20.20-1999 ESD Standard for Protection of
> Electrical and Electronic Parts/Equipment. It is available free on the
> Web.
> http://www.esda.org
>
> Sometimes you have to ground things that don't need to be grounded.
>
> Paul Signorelli
> NARTE ESD Certified Engineer
>
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