Did Lightning Rods do any Good?

Actually will help

prevents signals fromgetting onto the shield and then 'injecting' themselves inside to the center conductor. Also makes the coax 'higher' quality.Work on analyzing 'shield induced' noise may appear somewhere. The beads help prevent that.

Reply to
Robert Macy
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I read you wrong - I thought you wanted to put a ferrite clip on the COIL..

The co-ax wasn't the beast quality stuff either. The owner was a millionaire - which equates to "one cheap b@$r@rd".

Reply to
clare

hey, one accumulates money by bringing it in, and NOT letting it out.

Reply to
Robert Macy

That reinforces my use of 8 gauge. But my split tree makes me wonder.

Greg

Reply to
gregz

Wisconsin electrical engineering department,

only be #10 wire.

But this professor could back up his statements both with the math and with experience.

Part 1 of the article I linked to (which is no longer on line) has temperature data for wires. A #10 wire has a 200 degree C rise for a

100kA lightning stroke. About 5% of strikes are over 100kA, and there can be multiple strokes.

#10, or the house it is attached to, is likely to have problems in Florida.

Reply to
bud--

of Wisconsin electrical engineering department,

e need only be #10 wire.

uitive. =A0But this professor could back up his statements both with the ma= th and with experience.

A related factor, I would think, would be the voltage drop across the wire. Assuming your 100ka strike, a 50ft run of 10gauge would develop 5,000 volts. A 50 ft run of 4gauge would develop only 1,200 volts. At the higher voltage, the likelihood of the strikie flashing over to something other than the desired wire increases.

Reply to
trader4

Wisconsin electrical engineering department,

need only be #10 wire.

But this professor could back up his statements both with the math and with experience.

I assume that is based on resistance.

Lightning is a very short event which means it has relatively high frequency components (from a previous post most of the energy is below

100kHz.). That means inductance is likely more of a problem than resistance. Also skin effect. Larger wire has a major effect lowering resistance, but not much effect on inductance and skin effect. Both are covered in a link I posted.

Downconductors are #3 or larger. They are that large for reasons also in a previous post.

================================================= For power wiring, the 1968 NEC had correction factors for skin effect on large wires. I don't know when the tables were dropped; the correction was probably rolled into the other tables. The AC resistance of a 4/0 wire is increased by about 0.5% over the DC resistance. The diameter of a 4/0 stranded conductor is about 0.5".

Reply to
bud--

OK guys, this issue was discussed pretty thoroughly. Now it's time to see some lightning protection installed in a good location and good manor.

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Reply to
Red

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