A short history and review of shielded cables

Don Dodge
Calmont Wire and Cable, Inc.
Santa Ana, CA

HISTORY In the late 1800s, as the use of electricity was first being used for communications, interference reared its ugly head. The imperative
for some form of mitigation became apparent. The first attempts involved wire spacing. Bare wires on wooden poles were simply spaced farther apart to reduce interference. When the wires entered buildings and were forced closer to each other, twisting the pair was the preferred technique for
reducing interference. Look at early pictures of New York City; the sky is dark with thousands of wires for telegraph and telephone wires. Then radio came along, and radio broadcasts could be heard coming from the telephone wires. The need for shields became a problem begging for a solution.

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