CDCP Exam Dumps | Does shielded twisted pair network cabling provide protection against EMF from power cables?

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EXIN.CDCP.v2025-11-24.q42
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Question 26/42

Does shielded twisted pair network cabling provide protection against EMF from power cables?

A. Yes, but only if the power cable is placed in a tre-foil cable arrangement.

B. Yes, as the shielding for twisted pair network cabling is specifically design for low frequency EMF protection.

C. No, the shielding is designed for alien cross-talk between network cables, it provides no or little protection against low frequency EMF.

D. No, the shielding for twisted pair network cabling is for physical protection against vandalism and accidental cutting of the cable.

Correct Answer: C

Shielded twisted pair cables (STP) are Ethernet cables that feature additional protection against electromagnetic interference from external sources, such as radio waves, microwaves, or other network cables. This is achieved by wrapping each pair of wires with a conductive shield, usually made of foil or braided wire, and then enclosing the entire cable with another shield layer. However, this shielding is not effective against low frequency electromagnetic fields (EMF) from power cables, which can induce currents and voltages in the network cables and cause signal distortion or data loss. Low frequency EMF can only be reduced by increasing the distance between the power and network cables, or by using a tre-foil cable arrangement, which is a special configuration of three power cables twisted together to cancel out the magnetic fields they generate.
References: STP Cable: Your Shield Against Network Disturbances; What is Shielded Twisted Pair Cable? - Advantages, Disadvantages; Shielded vs. Unshielded Cables: What's the Difference? - Cable Matters.

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