Below is the 'Ask The Expert' Question in Superior Essex's March Newsletter:
Q: What are the differences between shielded and unshielded cables?
A: Shielded cables contain a screen, sheath, or cover that substantially reduces the coupling of electric, magnetic, or electromagnetic fields into or out of circuits or transmission lines.
The purpose of shielding is to protect the communications circuit from outside electrical interference and/or outside eavesdropping.
Cables featuring a metallic sheath for physical protection are sometimes referred to as shielded, but these are better described as armored cables. However, the more substantial metallic sheaths used for armored cables generally provide protection from electrical interference/eavesdropping as well.
Shields are often electrically continuous and require bonding and grounding. There are products available that utilize discontinuous shielding methods, which provide substantial benefits of shielding without the bonding and grounding requirements.
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