seperation of power and data FREE cabling and networking Helpdesk
 Question by brent goodbread posted 05 Mar 2004
 seperation of power and data
What is the standard or code for the seperation of power and data lines? The details are; UTP cable (CAT5E) run horizontally through metal studs, and the MC power cable is running paralell with the UTP in the same knockout. I believe this is a code violation, and have said that 2 inches need to be maintained.
 Answer by Dmitri Abaimov posted 05 Mar 2004
Dear Brent,

As per Article 800.52 - Installation of Communication Wires, Cables and equipment - of the latest NEC 2002, "communication wires and cables shall be separated at least 50 mm (2 inch) from conductors of any electric light, power ..." . There are two exceptions: it's OK if the cables are in a specifically designed (and rated) raceway with separated channels or if cables are permanently separated by continuous non-conductor, such as porcelain tubes or flexible tubing, in addition to insulation of the wire.

So, if cables are just touching with their jackets, then you are absolutely correct, this was a violation.

Also, we have a document written to further describe the issue, called "Guide to Separation of Network Cabling from EMI sources". You can
take a look here:

Dmitri Abaimov, RCDD

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