If your colleage doesn't understand why you shouldn't
mix water and electricity in general, just tell him that
water has a tendency to be rather unpredictable and
can go anywhere. Someone likened it to a three
dimensional resistor and that's an excellent example.
Add to it a very deformable
Rich
Do you use Google.com for searches. I did a search on water conductivity
yesterday and got a lot of hits with typical values. Many related to biological
studies.
See, for example http://www.dartmouth.edu/~bio59/conductivity.htm
-Jason
Rich Nute ri...@sdd.hp.com wrote:
Hi John:
Hi John:
Is there a value (or range of values) for the
resistance of water?
The data exists; it depends, of course, on solute nature and
concentration. Try a web search.
I did a web search before my post. There is lots of
data on the use of water resistance and
No risk of electric shock at these voltages. But in salt water environments, a
greatly increased risk of corrosion.
Which could in turn lead to a shock or fire hazard.
Slightly off topic, but a valid point to be considered.
Peter Merguerian wrote:
Jason,
Please explain to your colleague
If you work at a site with a large air conditioning plant or a chilled water
system, then chances are your facilities
manager will have a conductivity cell. They are used as a very quick means to
monitor water purity and to check for
signs of corrosion.
Units are expressed in uS/cm and
Jason,
Please explain to your colleague that for North American requirements (as
depicted in the NEC and CEC) there is no risk of electric shock or fire from
circuits in wet locations for up to 21.2 V. For higher voltages you should
start taking steps to minimize the risk of water ingress and
I read in !emc-pstc that Rich Nute ri...@sdd.hp.com wrote (in
200201030028.qaa08...@epgc264.sdd.hp.com) about 'Electric Shock and
Water', on Wed, 2 Jan 2002:
Is there a value (or range of values) for the
resistance of water?
The data exists; it depends, of course, on solute nature and
I read in !emc-pstc that jasonxmall...@netscape.net wrote (in
738426ed.4080ead3.73ea6...@netscape.net) about 'Electric Shock and
Water', on Wed, 2 Jan 2002:
INCREASED LEAKAGE CURRENTS
Water is generally conductive. If you are working on a chassis and
accidentally
touch an energized contact,
Water, as is generally conductive, forms a better surface contact ( to you),
reducing the surface
resistivity (yours), thus allowing a greater flow of lethal current through
the body (yours) from
an energised electrical device.
And when coupled with any, or all of the previous faults, you may
Hi Jason:
Water comprises a 3-dimensional resistor.
The value of the resistor depends on:
* the purity of the water itself (the
resistance is inversely proportional to the
purity);
* the dimensions of the electrodes (i.e., the
conductors in contact with the
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