<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<meta content="text/html;charset=UTF-8" http-equiv="Content-Type">
<title></title>
</head>
<body bgcolor="#ffffff" text="#000000">
I tend to agree with Chad but add server's to the list.<br>
<br>
And for what it's worth...<br>
<br>
Keep in mind, most outlet boxes, surge protectors etc. use a single
pole switch.<br>
Only the Hot side of the line is disconnected. Ground and neutral pass
right on through.<br>
<br>
This makes a remote possibility of AC coming in on neutral or even the
ground wire.<br>
<br>
Sometimes neutrals can even come from a different transformer winding
than the Hot lead.<br>
More common in plants but possible in large buildings.<br>
<br>
A neutral can always become disconnected (or loose) giving strange
problems.<br>
I had a rubber batching control system in Guangzhou with 30 or 40
chattering relays as a result of a loose neutral.<br>
Not good for them or the PLC's. Definitely not good for a PC.<br>
Luckily the Chinese tech had a screwdriver and plenty of time to
tighten a hundred or so terminals.<br>
We caught it before any equipment damage.<br>
<br>
Everything depends on the electrician.<br>
<br>
Really safe is, pull the plug and use a voltmeter (or some dongle) to
test the circuit before plugging it back in.<br>
Some surge protectors have wiring fault indication which should suffice.<br>
<br>
Bob<br>
<br>
<br>
<pre class="moz-signature" cols="80">R. W. (Bob) Neeper Cell: (740)-407-3572
Community Library
44 Burrer Dr.
Sunbury, Oh 43074
Tel: (740)-965-3901</pre>
<br>
<br>
Chad Neeper wrote:
<blockquote cite="mid:4BC725A8.9040700@level9networks.com" type="cite">If
the device will auto-power on when commercial power returns (copiers,
refrigerator, etc.), then I might consider unplugging it. If the device
is plugged into a power strip, then I'd suggest simply turning off the
power strip. Particularly expensive or critical devices (copiers,
treasurer's workstation, director's workstation, your workstation,
etc.) you might consider unplugging as a precaution. Weigh the rest
against the staff time and inconvenience of unplugging and then
troubleshooting when the devices don't get plugged back in correctly.
<br>
<br>
In general, however, I wouldn't expect too many problems. Your
electrical service is probably sufficient to handle the sudden power
requirements of the handful of devices that will suddenly come alive
when the power returns. Also, when the power returns it will probably
be more like flipping on a light switch, rather than the sometimes
up-and-down that you see when the commercial power grid comes back
online.
<br>
<br>
My 2 cents.
<br>
<br>
(Are there any retired electricians or electrical engineers out there
that want to tell us if I'm on the right track here?)
<br>
<br>
Chad
<br>
<br>
-----------------------
<br>
Chad Neeper
<br>
Senior Systems Engineer
<br>
<br>
Level 9 Networks
<br>
740-548-8070 (voice)
<br>
866-214-6607 (fax)
<br>
<br>
-- Full LAN/WAN consulting services --
<br>
-- Specialized in libraries and schools --
<br>
<br>
<br>
<br>
Phil Shirley wrote:
<br>
<blockquote type="cite">Our library is undergoing a renovation, so
we've had small planned power outages on one or two circuits. When this
has happened, in order to be completely safe, we've powered down the
affected computers and unplugged them from the power on the wall.
With good surge protectors this doesn't seem necessary but it hasn't
been a hardship.
<br>
<br>
Some morning next week the power for the whole building is going to be
out. We'll shut down the computers, but should we unplug them all from
the wall?
<br>
<br>
Phil
<br>
</blockquote>
<pre wrap="">
<hr size="4" width="90%">
_______________________________________________
OPLINTECH mailing list
<a class="moz-txt-link-abbreviated" href="mailto:OPLINTECH@oplin.org">OPLINTECH@oplin.org</a>
<a class="moz-txt-link-freetext" href="http://mail.oplin.org/mailman/listinfo/oplintech">http://mail.oplin.org/mailman/listinfo/oplintech</a>
Search: <a class="moz-txt-link-freetext" href="http://oplin.org/techsearch">http://oplin.org/techsearch</a>
</pre>
</blockquote>
</body>
</html>