On 7/11/13 12:13 PM, Stan Labinsky Jr. wrote:
re: ## 1 - Actually, Jim, this brings up a question germane to my 100 A
panel ca. the 60's. The surge shunts, the fused MOVs, connect to the
line side of the main disconnect breakers, correct? If so, how do you
"double tap" the leads to them? Apparently a really big deal, if the
lugs are not designed / approved for multiple lead connections, you fail
inspection. Or, do you find a load side on the buses and connect there?
I ask cause that would be a smart retrofit here.
These days, utility supplied transient suppression on the power line is
often installed on the meter socket: they pull the meter, put a TVSS on
the meter socket, then reinstall the meter.
re: ## 2 - Not in my telco's demark box, nothing alarmed, but there are
some sort of arrestors there. But, after complaining to the telco about
a broken clamp on their ground rod, I put one of my own there... for my
own protection. /-(
That's not unusual. I've never seen an alarmed telco TVSS in a
residential application. For myself, since I got fiber to the home,
it's a non-issue.
Also, my "grounding" connection courtesy of the power company, well is
the old tie it to the copper pipe. My well does use copper out to the
wellhead, but the down pipes are black plastic... (-( hmmm.
I'm planning to make connection to the service cable just below the
outdoor meter panel in a manner similar to that used to bond antenna
cables to the base of the tower. Just have to fabricate an aluminum
version of the coupler like the ones from PolyPhaser, the neutral/ground
is in aluminum, so I cannot use something in copper from a commercial
source.
If you go to the local electrical supply place, they probably have some
sort of device made to do this.
Stan
-----Original Message----- From: Jim Thomson
Sent: Thursday, July 11, 2013 11:20 AM
To: towertalk@contesting.com
Subject: [TowerTalk] Lightning..easy fix
Date: Thu, 11 Jul 2013 08:59:49 -0400
From: "Stan Labinsky Jr." <K2STN@frontier.com>
To: <towertalk@contesting.com>
Subject: Re: [TowerTalk] TowerTalk Digest, Vol 127, Issue 27
Message-ID: <675C4E0FEA3E4830A5F14788F2E82F75@stancommHP>
Content-Type: text/plain; format=flowed; charset="iso-8859-1";
reply-type=response
## 1 standard procedure is to use HUGE fused MOV’s right at the
entrance panel.
They are wired from L1 to neutral and also L2 to neutral. These are
typ 130-140 v
rated. That way, you have 2 x series movs across the 240 line..and a
mov from’each hot leg to neutral.
Neutral and ground are bonded together in main 200A panel.
## 2 Insurance companies like factory mutual will insist that telco’s
in both canada and the usa
use em. They are also alarmed. On 3 phase setups, 3 MOV’s
used....and also wired
hot to neutral. Ground rods used around the perimeter of a building.
The usual brand of entrance panel mov protection that is used is JOSLYN.
Also used
at all cell and microwave sites.
Jim VE7RF
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