Hi,
Something I should have added in my initial post.
The theory from the rep is. The cart itself is conductive. The cards
sit in dissipative trays, with conductive (I think) mats. So any charge
built up during transt stays on the cart, or on the card. Then the cart
gets plugged into an ESD outlet (same as wrist straps). This will carry
any built up charge from the cart to ground. Then when a grounded
operator removes the cards, everything is grounded, and should not
provide a chance for static damage.
Does this sound resonable?
The other concern that I have is someone releasing a charge build-up by
being in close proximity (or even contact) with the cards while on an
ungrounded rack or themselves not being grounded. This could be handled
by proper training, but ESD procedures don't always seem to be followed
to the letter of the law.
Thanks,
Jason
Production Engineer
Northrop Grumman Canada Corporation
Halifax
Box 960
Enfield Postal Station
249 Aerotech Drive
Enfield, Nova Scotia
B2T 1K9
TEl: (902) 873-2000 Extension 6564
FAX: (902) 873-2174
>>> "Marsico, James" <[log in to unmask]> 10/02/03 09:24AM >>>
Sounds fishy... Walking on a non-ESD floor (vinyl?) will probably
generate
static electricity, which would be conducted from the "pusher" to the
cart
to the static sensitive hardware. I would think that you still would
need
to shield the hardware (ESD totes or bags) to prevent damage. The old
faraday cage theory.
Jim Marsico
Senior Engineer
Production Engineering
EDO Electronics Systems Group
[log in to unmask] <mailto:[log in to unmask]>
631-595-5879
-----Original Message-----
From: Jason Wilson [SMTP:[log in to unmask]]
Sent: Thursday, October 02, 2003 7:44 AM
To: [log in to unmask]
Subject: [TN] Bliss carts with non-ESD flooring
Hello Fellow Technetters,
We are thinking of trying Bliss Industries carts for handling
circuit cards
in WIP. However, we do not have ESD flooring. According to
the
reps they
can be used safely without ESD flooring, and without any cart
sheilding.
Does anyone out there use Bliss carts without an ESD floor? Can
you
let me
know your experience with doing this?
Thanks in advance for all help provided,
Jason Wilson
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