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Terminated Isolation Conductor

Isolated Downconductor is a specialized lightning protection downconductor, that during operation may be subjected to impulse currents of over 100kA and voltage of up to 700kV may be developed. The ISODC is designed and tested to control separation distance and arching. A semi-conductive outer layer is used to minimize voltage gradients under lightning conditions. The ISODC is available with a copper or aluminum core.


  • Provides protection of equipment against lightning strike flashover by providing an insulated path to ground via an equivalent safety distance
  • Supplied with factory upper termination and materials for field installed lower termination


Material: Aluminum; Polyethylene
Part Number LengthL Thread SizeTS DiameterØ
ISODC03 9.8' M16 1.035"
ISODC04 13.1' M16 1.035"
ISODC05 16.4' M16 1.035"
ISODC06 19.7' M16 1.035"
ISODC07 23.0' M16 1.035"
ISODC08 26.2' M16 1.035"
ISODC10 32.8' M16 1.035"
ISODC14 45.9' M16 1.035"
ISODC15 49.2' M16 1.035"
ISODC16 52.5' M16 1.035"
ISODC17 55.8' M16 1.035"
ISODC18 59.1' M16 1.035"
ISODC20 65.6' M16 1.035"
ISODC23 75.5' M16 1.035"
ISODC25 82.0' M16 1.035"
ISODC27 88.6' M16 1.035"
ISODC30 98.4' M16 1.035"
ISODC35 114.8' M16 1.035"
ISODC40 131.2' M16 1.035"
ISODC45 147.6' M16 1.035"
ISODC50 164.0' M16 1.035"
Additional lengths available in 1 m (3.28') increments up to 50 m (164').
Follow IEC® 62305-2 and IEC® 62305-3 standards when designing an isolation downconductor system and to determine maximum allowable length and offset for the isolation conductor. Contact ERICO for system design assistance.

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