T
Timothy Daniels
Guest
"Michael A. Terrell" wrote:
of a capacitor measured in Ohms.]
Would you please sum up what you believe to be prudent
protection (for electronic equipment) from nearby lightning strikes?
I'm thinking of both in single-family homes and in condo/apartment
buildings. What would you do to protect from in-house (or in-building)
surges, such as elevator motors suddenly shorting out, or welding
equipment in use?
*TimDaniels*
[ElectoMagnetic Pulse]All I know is that I finally kill filed him on this computer after I got
tired of reading his 'twilight zone' electrical & electronics babble.
I am a former radio & TV broadcast engineer, and if I followed
his or _wacko_tom's warped ideas, I would have had millions of
dollars worth of damage. I had a studio building and STL tower
in Leesburg Florida hit by a direct strike. It blew chunks of concrete
from the building where the rebar and threaded rods ran vertical.
It WAS an excellent example of _wacko_tom's UFER ground,
before the steel vaporized inside damp concrete. 95% of the damage
was caused by the EMP.
[Equivalent Series Resistance - the total of all internal resistancesI lost the 11 GHz Cars band STL, the 1A2 type phone system,
all the computer terminals, and had some minor problems with
other electronics. It turned out that the dead terminals all had high
ESR electrolytics,
of a capacitor measured in Ohms.]
[Uninterruptible Power Supply]and that they were working because they were all on UPS
[Studio-to-Transmitter Link (see http://www.fmamtv.com/rdstl.html)]before the strike took out all the electricity. The power 1A2 supply
needed some of the weird WE fuses, one KTU card and was back
in service. The STL
[Local Oscillator]was mounted on the tower in a steel NEMA box, and lost the LO
[Electrical Metallic Tubing, i.e. metal conduit]module. It was 20 years old, and at least 10 years obsolete, so it
needed that module updated, anyway.
I started with the phones, then arranged a twice a day courier form
the studio to the transmitter site with U-matic tapes. We rented a
STL transmitter and shipped the damaged system to the OEM for
repair & upgrading. The terminals were down for a day, while I
waited for the new electrolytics. Or viewers didn't even know we
had been hit. Then I moved the microwave racks to a closet in the
corner of the building, and used 4" EMT
between the rack and the tower. That was 20 years ago. They
have had strikes since then, but no problems.
Would you please sum up what you believe to be prudent
protection (for electronic equipment) from nearby lightning strikes?
I'm thinking of both in single-family homes and in condo/apartment
buildings. What would you do to protect from in-house (or in-building)
surges, such as elevator motors suddenly shorting out, or welding
equipment in use?
*TimDaniels*