Re: UPS/Power conditioning questions
From: w_tom (w_tom1_at_hotmail.com)
Date: 03/12/05
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Date: Fri, 11 Mar 2005 18:26:18 -0500
John defines 'whole house' protectors. But don't assume for
a minute that the 'protector' is also 'protection'. Why are
'whole house' protectors so effective? They make a 'less than
10 foot' connection to single point earthing. Earthing
defines the protection. 'Whole house' protectors - as is true
of any protector - is only as effective as its earth ground.
For residential service, that means the earthing system must
meet or exceed post 1990 NEC requirements. IOW earthing to
copper pipe is no longer sufficient. In simple terms, the
ground connection to a pipe must be for removing electricity
from that pipe AND not for dumping electricity into that
pipe. Cold water pipe is not longer a sufficient earth
ground.
Other examples of 'whole house' protectors at very
competitive costs are Intermatics IG1240RC in Home Depot, and
products in Lowes from Cutler Hammer and GE. Leviton also
makes a 'whole house' protector so often promoted by regulars
in the Home Automation newsgroup. These are X-10 remote
control enthusiasts whose devices don't work well around
plug-in protectors.
So many effective solutions for computer hardware
protection. Virtually no serious protectors have been
observed with manufacturer names such as APC, Belkin, Monster
Cable, Panamax, and Tripplite. Its not hard to see why.
Simply ask about the earth ground connection. The connection
they don't provide and don't want to discuss. A surge
protector is only as effective as its earth ground.
John Smith wrote:
> Start here as an example:
> http://www.eatonelectrical.com/NASApp/cs/ContentServer?pagename=C-H/Common/A
> ssetTemplateLink&c=Apubarticles&cid=986495734777&Sec=products
>
> Nearly all electrical major electrical distribution panel manufacturers
> offer something of use...Square D, Siemens, etc.... and there are also
> specialty manufactures in this game too.
>
> I don't know whether you are working with a residential panel or commercial
> panel at your location, but assuming a residential panel for the moment,
> install something like the above in the distribution panel first, and then
> make sure that the UPS you purchase is an 'always on' pure sine wave model.
> You may even wish to stick a line conditionor in ahead of the UPS.
>
> Make sure all your external telecom connections are brought back to a common
> ground with the electrical system and that there are no breaks in the ground
> continuity to earth - in homes there are often bits of plastic pipe found,
> as a result of renovations, between where you install the ground strap and
> the actual earth point. If you have a copper water main into the house and
> locale electrical code allows grounding to that pipe, make sure the ground
> point is the first connection on the pipe - before any shutoff valves,
> meters, etc....
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