ECN Electrical Forum - Discussion Forums for Electricians, Inspectors and Related Professionals
ECN Shout Chat
ShoutChat
Recent Posts
Old motor connections
by suzannemiller - 09/28/21 02:53 AM
How's all our Non-US folks doing?
by grich - 09/27/21 11:59 AM
Well I am back to stay (nearly 6 years)
by Bill Addiss - 09/26/21 11:09 PM
nec 110.3 (B)
by HotLine1 - 09/26/21 03:42 PM
New in the Gallery:
Now you know.
Now you know.
by Tom_Horne, September 7
February, North East Indiana
February, North East Indiana
by timmp, July 25
Who's Online Now
2 members (Scott35, gfretwell), 40 guests, and 24 robots.
Key: Admin, Global Mod, Mod
Previous Thread
Next Thread
Print Thread
Rate Thread
Joined: Feb 2008
Posts: 193
S
Member
My dad and I are going to Malawi, Africa in two weeks to set a computer lab at an orphanage. This is so the kids and young adults can learn basic computer, typing, and word processing skills. Hopefully this will enable them to have a better skillset and in turn earn better wages. We are setting up 10 computers and two printers. With the dry air, how concerned do we need to be with static in the room. The room will have AC which will keep it cool but will only lower the humidity more. What is the best way to discharge the static.

Thanks

Joined: Jul 2004
Posts: 9,663
Likes: 4
G
Member
Put static mats under the work stations. Teach the kids to touch the static pad before they touch the machines.
Things like chairs with steel casters and a static treated carpet/floor help. Back in the olden days a computer room floor was conductive and bonded. So were the carpet mats at the consoles. It was high resistance but it was conductive.
Machines are getting better with ESD but it still can be a problem if you can't control humidity.


Greg Fretwell
Joined: Dec 2002
Posts: 318
S
Member
Cheaper may be to use a diluted solution of Downey to apply lightly to the carpet (a spray bottle on mist works, but a hand held, hand pump, pressurized sprayer works best), and to cloth covered seats whenever static raises its ugly head. I rather suspect the following - If the floor is concrete and the chairs wood you should be OK.

One note, I have found lately and that is...all dryer sheets are not created equal. I found one brand that does not stop static no matter what. I think they would cling together if you placed a complete box in the dryer with nothing else, so based on this, be careful in your choice of liquid softeners.

Joined: Dec 2002
Posts: 318
S
Member
Also teach them to keep the area clean (dusting and sweeping), and to keep the equipment covered when not in use, if this place is more like what I would expect, which may not even have windows if it is rural enough. If the floors are dirt, cleanliness is even more critical, the floor needs to be hard packed. They will need to open things up and blow them out fairly often. Keep chalk boards away (often individual slates used by the children as paper is a premium).

Joined: Mar 2005
Posts: 1,213
S
Member
You don't need to be very worried.

Keyboards and mice are insulated plastic. Static shocks to the grounded PC case can in theory be an issue, but in practice, not really. The biggest danger is static shock while working on components inside the PC- there's no protection there, and as little as a few tenths of a volt can be fatal to a modern microchip. They won't be doing much of that, though, will they?

Just make sure everything is properly and thoroughly grounded and installed robustly enough to take decades of abuse without becoming a safety hazard. Dry sandy soil has terrible conductivity, so you may have to drive supplemental grounding electrodes to get reasonable resistance to ground.

Also, if it really is that dry, you might want to think about installing a swamp cooler instead of an AC unit- would be cheaper to operate and woul humidify the air, too.

Joined: Jul 2002
Posts: 8,407
Likes: 2
Member
Hey Eric,
Good on you, mate, great to see someone doing something really worthwhile.
I think another thing that needs to be said is, be careful of cheap synthetic carpets, walking across that stuff can generate 10's of thousands of volts, even over a very short distance, regardless of the ambient humidity.
Wearing nylon and polyester clothing can have the same effect too.


Link Copied to Clipboard
Featured:

Tools for Electricians
Tools for Electricians
 

* * * * * * *

2020 Master Electrician Exam Preparation Combos
2020 NEC Electrician
Exam Prep Combos:
Master / Journeyman

 

Member Spotlight
mxslick
mxslick
Atomic City, ID USA
Posts: 806
Joined: October 2004
Top Posters(30 Days)
timmp 3
rick99 1
Popular Topics(Views)
283,621 Are you busy
216,894 Re: Forum
203,238 Need opinion
Powered by UBB.threads™ PHP Forum Software 7.7.5