For the proper grounding rules you should refer to ANSI EOS/ESD S 6.1 which
reflects ANSI/NFPA 70-1990 and ANSI/IEEE Std 142-1982, IEEE Green Book.
These are reflected in the Technical Requirements Summary of
ANSI/ESD-S20.20-1999
Alan Cash
----------
From: Paul Klasek [SMTP:[log in to unmask]]
Sent: Friday, October 08, 1999 10:09 PM
To: [log in to unmask]
Subject: Re: [TN] Conductive Floors ...
"CONDUCTIVE" is used only in ammunition and fireworks factories,
explosive
compounds generally ;
otherwise with powered equipment on the floor it can kill .
Dissipative vinyl would be best way to go ;
The self dissipating(with some humidity in the air) paint on
concrete does
not last in traffic spots more than couple of months .
Bare concrete is neutral, but dusty; sealed with epoxy is static
generating
, not dissipating .
Doug, the archives are full of ESDAssociation references ;
which I'd find more practical than BS or DIN,
you can get them on disk as well .
Repeating myself again : make sure you have 1Mohm resistor somewhere
between
ground and grounded .
There is a legal difference between conductive and dissipative
surface when
it comes to accidents ;
and even ESDA standards underline the safety as a logical PRIORITY:
for example whereas SSteel cabinet covers are normally grounded
direct ;
in instances of working with power equipment for example on SSteel
bench ;
that bench should be grounded indirect (with resistor in the path) .
ESD's grounding does have similar character as CO2 versus CO ;
TOO simple and common perceptions can be deadly in certain
circumstances
without lateral thought .
Similar to those having gas heaters not flued outside .
Get the standards Doug, they're absolutely essential;
this is one of few fields where "common sense" is not desirable .
Paul Klasek
ResMed
-----Original Message-----
From: Doug [mailto:[log in to unmask]]
Sent: Friday, 8 October 1999 17:14
To: [log in to unmask]
Subject: [TN] Conductive Floors ...
What's the actual resistance of a floor that's
considered acceptably "conductive" for an area
that will be handling telecommunication boards?
I mean, if a customer came into your facility
and wanted to measure your floor to have it pass
or fail being a suitably "conductive", what
resistance would they use for that criteria?
A former coworker informed me that my old company
is moving to their new building. With the move
is the discussion about whether to leave the new
area as bare concrete, tile it, or paint it.
I'm of the opinion that they can leave it as bare
concrete, but that's only my opinion.
The old building had conductive tile with copper
strips and was extremely expensive but reliable.
It also seemed to make the customers feel at ease
with something they could see as opposed to bare
concrete. I can remember making periodic checks
with a surface resistance tester, but for the life
of me, I can't remember the limits.
Any additional comments or opinions appreciated,
since this topic seems to come up here every now
and then.
Regards, Doug
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