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...isolation voltage for Cat5 cable. Please...

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Question by Joray
Submitted on 7/9/2003
Related FAQ: Data Communications Cabling FAQ
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What is the isolation voltage for Cat5 cable.  Please answers me at bjujo@videotron.ca.

Answer by RF Communications
Submitted on 8/19/2003
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Did you receive a response to your question?  I am looking for a response on how many Volts/meter is Cat-5 Cable able to withstand.


Answer by me
Submitted on 9/8/2006
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These are different phenomena.  Voltage withstand is a measure of the cable insulation's ability to not breakdown, arc, or flashover, when exposed to a nearby voltage source.  This is usually a transient event and is measured in volts -- many volts -- sometimes in the thousands.  Immunity to electromagnetic fields is another phenomenon. The fields are measured in volts/meter.  Perturbations in the latter will  be a temporary disruption to the communication transmission, while in the former, hardware damage or temporary software latchup may result.  ITE cables tested for immunity to fields are tested at 10 or 20 v/m, and have an added 80% of amplitude with modulation at 1,000 Hz. Some Medical devices and TTE are tested to higher fields.  Vehicles and aircraft may be illuminated with 200 v/m or more.


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