The insulated Suspension Chain ISC

is a straightforward solution for increasing the operating voltage of power lines fast and simple. Voltage increases can mean lengthy planning approval processes and high investment costs if the towers need to be changed. With Insulated Suspension Chain ISC (German: iTAK – isolierte Tragabspannkette), the tower and suspension points remain the same. The existing infrastructure (poles) can still be used. Furthermore the ISC is an excellent solution to fulfill the requirements of  bird protection.


  • Overhead lines that are to be upgraded to a higher voltage level


  • One Y suspension chain with three insulators in a Y shape (porcelain or silicone)
  • Insulated conductor loop
  • Matching protective fittings


  • Cost-effective
  • Environmentally friendly
  • Durable
  • Easy to fit
  • Tested connection
  • Bird protection


  • Type test in line with IEC 60071
  • Lightning impulse withstand voltage of 550 kV positive/negative
  • Power-frequency withstand voltage test 230 kV dry/wet
  • Switching impulse withstand voltage test 742 kV
  • Bird protection test

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