I agree with Joe.
Of course it would be better to have all personnel grounded
"The fundamental ESD control principles that form the basis of this document
are:
A. All conductors in the environment, including personnel, shall be bonded
or electrically connected and attached to a known ground..."
[ANSI/ESD S20.20 section Foreword]
The requirement is "All personnel shall be bonded or electrically connected
to the grounding / equipotential bonding system when handling ESDS [ESD
sensitive] items." [ANSI/ESD S20.20-2007 section 8.1]
Is the drawer part of the ESD protected area. This may be in the handbook
TR20.20 but I found this in ESD-ADV53.1-1995 ESD Protective Workstations
"Electrical Requirements
. Workstation elements shall be connected to, and maintain electrical
continuity to, the common point ground as follows:
. Worksurfaces - Resistance: Between 1 x 10^6 ohms and 1 x 10^9 ohms
(as measured per para. 6.3 of this document).
. Surfaces of shelves and drawers intended to be used for unprotected
ESD sensitive devices - Resistance: Between 1 x 10^6 ohms and 1 x 10^9 ohms"
Gene Felder
[log in to unmask]
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Kane, Joseph E (US SSA)
Sent: 2010 - 05 - 26 10:21 AM
To: [log in to unmask]
Subject: Re: [TN] ESD spec question
You might be okay, but my somewhat strict reading of the standard, and the
way we train, is this:
Items are protected if they are enclosed in ESD-protective packaging (like a
closed metal cabinet that affords a Faraday cage).
An item may be removed from protective packaging only at an EPA, which
includes personal grounding for the operator.
So by extension, it's not okay to open an ESD protective bag or box and look
at the item inside if you're not grounded. I know that people do this
sometimes when nobody's looking, but it's not an approved practice.
Therefore I don't think it's okay for an ungrounded person to open the metal
cabinet and look inside. Touching the grounded handle will help bleed off
any charge you might have, but parts won't be completely protected for
several reasons, including the possibility that eventually someone might do
this while wearing gloves.
-Joe
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Graham Collins
Sent: Wednesday, May 26, 2010 12:30 PM
To: [log in to unmask]
Subject: [TN] ESD spec question
Hey TechNet
It's been a quiet day on Technet!
I've got a question regarding ESD. I was taught that if I am not grounded I
do not go near anything that is ESD . The example we are debating here
today concerns parts that are stored in metal cabinets.
The cabinet is grounded, and within the cabinet drawers there are ESD
sensitive parts in individual bins, not covered or packaged (no faraday
cage).
Is it OK to open the drawer and look into the cabinet without being properly
grounded? I say no, but am I being overly cautious?
If "no" is the right answer, where would I find that in an ESD spec?
I've given ESD-S20.20 a quick peruse, nothing jumped out at me.
regards,
Graham Collins
Halifax Production Engineering
(902) 873-2000 ext. 6215
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