With lightning it is the very high current and the fast rise time that gets you.
So yes, a tenth of an ohm can develop 1 kV across it with a big direct hit.
Having the best surge strip made won't help you if its cord and the output cords
are all in a single heap together as they will nicely couple to each other,
bypassing the protection.
On 3/16/2013 2:45 PM, Don Latham wrote:
Ah. Why bother with all that mess, 'specially if the ground rod is cad
plated instead of copper. The right clamp is cheap, and not likely to
start the whole surroundings on fire. yikes. There are codes for
grounding for both electrical as well as lightning systems. Do not
forget that separate grounds for the electrical system and the lightning
system are not a good idea. Think a tenth of an ohm and a few kv...
Don
Don
Martin A Flynn
Exothermic weld = CadWeld. See
http://en.wikipedia.org/wiki/Exothermic_welding
On 3/16/2013 2:11 PM, Bob Camp wrote:
Hi
Better check the electrical code in your area. They likely are quite
specific about what you can and can't do with a proper ground
connection. Copper / copper welding generally means brazing or
soldering. Both are often prohibited due to the heat burst at the
joint during a lightning hit. That surprised me a bit the first time I
ran into it, but made sense once I dug out the explanation.
Bob
On Mar 16, 2013, at 1:42 PM, Don Latham <[email protected]> wrote:
ground rods usually thin copper clad over steel. Better to use proper
copper clad clamps with anticorrosion paste than to try to weld.
Don
Martin A Flynn
On 3/10/2013 11:18 AM, Martin A Flynn wrote:
Sorry about the blank messages - not sure why I could not reply to
my
own message...
In any case, thanks to the help from kind folks on the list, the
TS-2100L in in the rack at the N2MO amateur radio station at
InfoAge.
The N2MO team spent yesterday doing the prep work to mount a 27dB
antenna on the gable end of the building, using 1/2 heliax for feed
line, with a Polyphaser DGXZ + 06NFNF installed in the line before
it
enters the building.
The antenna mount pipe and the Polyphaser are grounded via #2
copper
cable that will be exothermic welded to the ground rod.
Thanks again!
Martin Flynn
PS - Now that the precision time bug has bitten, the team, is
considering a Rubidium standard!
Precision time novice needing help ! We have chance to upgrade
(replace) our existing TS-2100-L with a TS2100-GPS system with the
rubidium option.
What questions should we be asking the seller?
* Is there a method to determine the lamp hours from the console?
* Software vintage that corrects the 1PPS issue (or is it
relevant)?
While InfoAge is a huge site, it is not a huge budget!
Martin
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