Armored for Battle

Posted on Monday, June 8, 2015 by Kimberly Versaw

In previous blog entries we discussed noise and signal interference, the types of noise, and the importance of shielding cables.  Now that we know why we use cable shielding, let’s discuss what shielding Alpha Wire can offer for our hazard-matched product line.  

Alpha Wire offers Xtra-Guard® cables in three shielding options to handle any electrical environment:


Unshielded cables provide the smallest cable diameter for use in low-noise controlled environments.


Foil Shield

  • Lightweight shielding
  • Low cost
  • Ease of termination with use of stranded tinned copper drain wire
  • High-frequency interference
  • 100% coverage over the core of cable conductors

Alpha aluminum/polyester foil shielding consists of an aluminum polyester tape, foil side facing inward, with a 25% overlap and in contact with a stranded, tinned copper drain wire equal in size to insulated cable conductors.  A tinned copper drain wire makes grounding the cable easy while the foil shields allow lighter weights and smaller cables.



  • Ease of termination with use of stranded tinned copper drain wire
  • High-frequency interference
  • High physical strength

Alpha’s premium Supra-Shield cables combine a triple-layer aluminum/polyester/aluminum foil with a tinned copper braid shield with tight 70% coverage.  Supra-Shield offers exceptional EMI performance and flexibility to protect against noise and maintain overall system integrity.  The combination of foil and braid offers better shielding effectiveness than either approach alone against both low- and high-frequency noise.


Supra-Shield for flexing cables

  • EMI/RFI resistance in power, control and data applications
  • Continuous shield continuity in flexing applications
  • High physical strength

Our high-flex shielding options include a double-jacket configuration with 85% braid coverage to achieve high shielding effectiveness while maintaining the desired flexibility.  For torsional flex applications, we offer spiral wound shielding with 90% coverage.


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