[78613] in North American Network Operators' Group
Re: nanog [really inspectors & MOV's]
daemon@ATHENA.MIT.EDU (David Lesher)
Mon Mar 14 00:41:52 2005
From: David Lesher <wb8foz@nrk.com>
To: nanog@merit.edu (nanog list)
Date: Mon, 14 Mar 2005 00:41:00 -0500 (EST)
In-Reply-To: <20050313222816.A2321@cgi.jachomes.com> from "Jay R. Ashworth" at Mar 13, 2005 10:28:16 PM
Reply-To: wb8foz@nrk.com
Errors-To: owner-nanog@merit.edu
Speaking on Deep Background, the Press Secretary whispered:
>
> > Virtually all surge protectors have MOV - Metal Oxide Varisters -
> > within. These are devices with s sharp knee on their Voltage vs
> > Resistance curve. In other words, they do not conduct for a 120V
> > level, but do at 200, shunting that overvoltage to ground.
>
> Careful: that conduction voltage is peak, is it not?
Some Marketing Dude must have decided that such was too complex
for customers.... So the traditional MOV part # is a f(RMS working
voltage) NOT the peak where it conducts... Grr Gnash Argh!!!
Note the "customer" is a design engineer...
> Smoke emitting diodes?
MOV's are bipolar...
> > But note that the OP does not have a MOV issue; he has an inspector
> > issue. His best answer there may be buying outlet strips that
> > offer no surge protection. He likely will need to first pin
> > the inspector down on what rules he's allegely broken, however.
>
> This is the most cogent point to date, and the one I made off list: ask
> him to quote chapter and verse.
And be sure it's not an Alexander Hamilton type issue..
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