Distance Btw Network Cable and Power Cable

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 Question by Tan Dawson posted 05 Mar 2002
 Distance Btw Network Cable and Power Cable
I would be grateful if you could answer to my queries below:
1 ) What is the recommended separation in distance for UTP(unshielded) and FTP(shielded) cables and power cables?
2 ) Is both ends of the foil of a FTP cable require to be grounded or just one end?

Thank you.
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 Answer by Dmitri Abaimov posted 03 Jul 2002
Dear Tan,

The distance recommendations differ from manufacturer to manufacturer. Some even allow zero separation distance. This should be taken with care because by NEC you cannot put them closer than 2 inches (~ 5 cm) due to fire safety concernes, not EMI. Generally, you are fine if you stay at least 1 ft (~30 cm) away from power cables.

We do have a document that specifically addresses power separation issues. You can get it here: http://www.cabling-design.com/resources/documents/

You should ground the telecommunication room end of the FTP cable. The other end gets grounded through equipment that it is attached to. Therefore, it is crucial that the cord is also shielded. This is the little detail that gets overseen very often. Beware or UTP cords attached (well, left and right, ewerywhere by everyone) to a shielded system!

Sincerely,
Dmitri Abaimov, RCDD

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