Yours is the best answer, Blair.
The reason that EOS/ESD 20.20-1999 was written this way is because we
know that all ungrounded personnel pose a risk to unprotected devices.
Simply walking can create a tremendous charge, and without a path to
discharge (ESD footwear or heel straps) a charged body can bring a very
high voltage potential into the ESD zone. One does not have to come in
direct contact with unprotected hardware; the charge can be indirectly
fed into the exposed hardware through a bench, a metal shelf or other
conduit. There are very good reasons that the standard states that
personnel shall not enter the ESD zone unless they are wearing proper
footwear (and testing them BEFORE entering the zone) and smocks. If a
person goes into the area infrequently, they should wear heelstraps. If
they enter a zone on a regular basis they should invest in a pair of
good ESD shoes, even if they do not usually handle hardware.
The shoes are cheaper than the heel straps in the long run.
And don't forget to wear the green RoHS-compliant heel straps if you are
entering a Lead-free ESD zone! :-)
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Hogg, Blair K.
Sent: Monday, March 05, 2007 8:22 AM
To: [log in to unmask]
Subject: Re: [TN] ESD question
Bob,
This is kind of a tricky question. If you have defined the ESD protected
area (per ANSI/ESD 20.20) as the entire room, then per the spec
requirement any personnel entering the room should have heel straps. If
the ESD protected area is only defined as the workstations within the
room, then someone entering the room will not need them. However, as
Graham pointed out, product should not be affected as long as an
ungrounded person comes no closer than 12 inches from unprotected
product (not in an ESD protective container, such as a bag or tote).
Blair Hogg
Director of QA/Continuous Improvement
GAI-Tronics Corp.
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Bob Arciolla
Sent: Monday, March 05, 2007 8:57 AM
To: [log in to unmask]
Subject: [TN] ESD question
Good Morning all,
A question regarding ESD has come up in our facility. Our SMT area has
ESD flooring and the question that came up is that one of our
instructors says that anyone entering the room must have heel straps on
and another says that if a person is just going into the room and not
touching product, they don't need heel straps. Who is correct?
Regards,
Bob Arciolla
Endicott Research Group
Quality/Safety Manager
607 754-9187 ex 3034
607 754-9255 fax
cell 607 624-8516
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