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October 1999

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From:
"Ingemar Hernefjord (EMW)" <[log in to unmask]>
Reply To:
TechNet E-Mail Forum.
Date:
Mon, 11 Oct 1999 09:33:47 +0200
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So the word "conductive" is the same as "grounded". How then can the steel deck of craftcarrier be grounded? There is only water around./Ingemar


"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

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