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Posted by Beachcomber on November 25, 2006, 1:56 am
On Fri, 24 Nov 2006 23:32:51 -0600, lwasserm@fellspt.charm.net ()
wrote:
>>On residential new construction, how close can a interior phone line be to
>>electrical wiring without being affected by electromagnetics? Can they
>>cross each other?
>
>Thye can be right next to each other abd touching without any
>electrical interference, but it won't meet code on safety.
>
Remember that if the is no current on the AC lines, there will be no
magnetic induced fields, even though the lines may be energized.
Since the dawn of telephone communication, crosstalk between the phone
lines (and from external sources) has always been a problem, although,
now it has been minimized due to a better understanding, and improved
materials and installation techniques resulting from scientific
developments.
The first phone lines were single conductors with a common ground like
telegraph lines and suffered from severe crosstalk and power line
interference. Multiconductor circuits, loading coils, and twisting of
conductors helped to solve the problems. Ultimately, phone lines and
switches became digital (ESS) long before the Internet became
mainstream.
Beachcomber
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