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May 2010

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From:
"Kane, Joseph E (US SSA)" <[log in to unmask]>
Reply To:
TechNet E-Mail Forum <[log in to unmask]>, Kane, Joseph E (US SSA)
Date:
Wed, 26 May 2010 13:21:12 -0400
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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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