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Guest Message by DevFuse

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system never grounded????

moving

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23 replies to this topic

#21 OFFLINE   joe diamond

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Posted 18 April 2011 - 03:01 PM

Joe: >Is there measurable static build up on the sat dishes?

These dishes are pummeled with 18V on a regular basis. They can sometimes deliver a buzz.

Mantech: >the exterior of the 18g ground wire had melted and exposed the copper.

It's cool that the wire survived.

I checked out an old 18" dish on a golf course that was struck by lightning. It vaporized the first 30' of RG-6 going into the attic. You could see the dust from the PVC jacket lying on the attic floor.

Singed the wooden cupola near the dish too. Clearly, for a moment, the dish was on fire.

What's funny is that after a certain point, the vaporized RG-6 was fine. I barreled it off. Probably cut off ten inches just to be safe.


liquid,

That has been my experience....not getting vaporized...but, in lightning events,....... to see the cable, ground line, 12/2...whatever, "burn open" as the potential charges seek equilibrium.

Along those lines...I got this one from a retired big company electrical supervisor...."do one loop in all electric service lines;" lamps, computers, TVs...anything! If the big spike gets that far it will burn open on the loop and go elsewhere, saving the appliance.

Never lost a beer box before or after doing so myself.

Joe

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#22 OFFLINE   liquidctv

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Posted 18 April 2011 - 03:13 PM

Oh the first thirty feet was completely gone. Like when Wile E. Coyote gets zapped and becomes dust on the floor....there was dust on the floor.

And then the wire reappeared 100% intact.

>"do one loop in all electric service lines;" lamps, computers, TVs...anything!

So you're saying the circuit will burn open. Interesting.

#23 OFFLINE   joe diamond

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Posted 18 April 2011 - 08:58 PM

Oh the first thirty feet was completely gone. Like when Wile E. Coyote gets zapped and becomes dust on the floor....there was dust on the floor.

And then the wire reappeared 100% intact.

>"do one loop in all electric service lines;" lamps, computers, TVs...anything!

So you're saying the circuit will burn open. Interesting.


That is what I pass on.

The other one-time observation I have is that among several Directv systems that were damaged by a lightning strike....it was the boxes connected by a TELCO line that had damage. Nothing nearby was apparently hit.

The other concept I watch & study is the direction of the charge / destruction
as a lightning bolt hits, ground to sky or sky to ground? It makes sense that lightning progresses from the mountain of the gods. But how about the other way?

Joe

Edited by joe diamond, 18 April 2011 - 09:03 PM.
typo


#24 OFFLINE   veryoldschool

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Posted 18 April 2011 - 10:14 PM

The other concept I watch & study is the direction of the charge / destruction
as a lightning bolt hits, ground to sky or sky to ground? It makes sense that lightning progresses from the mountain of the gods. But how about the other way?

Joe

Some of the shows on this with high speed cameras show it goes both ways.
Guess it simply comes down to the polarity of the charge.
A.K.A VOS




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