I am trying to find out what the requirements are on dielectric strength and isolation between the conductors in a Gigabit Ethernet transmission line.

A first place to look would of course be the TIA-568 standard, but I can't afford to buy it.

Second place to look would be in a manufacturers datasheet for a Cat5e cable like this one, which specifies the following:

Dielectric strength conductor-conductor and conductor-screen (2 seconds) : 2.5 kV DC

That's what I'm looking for, but the problem with this is that the manufacturer might have taken some headroom over the minimum value allowed by any possible standard. So that's a dead end, as I see it.

Are there requirements on this property in any standard? If so, which one and where to find it?

Thanks in advance!

  • \$\begingroup\$ You should be able to deduce them from the used voltages \$\endgroup\$
    – PlasmaHH
    Commented Feb 29, 2016 at 15:12
  • \$\begingroup\$ @PlasmaHH Those voltage levels are known, but I'm looking for any possible universal requirement regulated by some standard. \$\endgroup\$
    – Niklas
    Commented Feb 29, 2016 at 15:14
  • \$\begingroup\$ What is the insulation rating on the cables between conductors? Compare and cross refer this with the breakdown voltages specified for the magnetics. \$\endgroup\$
    – Andy aka
    Commented Feb 29, 2016 at 17:56
  • 1
    \$\begingroup\$ @Andyaka That is a good start, but I haven't been able to find that either. Is it in the TIA-568 standard perhaps? I can't afford to buy the standard though... \$\endgroup\$
    – Niklas
    Commented Mar 1, 2016 at 9:57
  • \$\begingroup\$ Go look at manufacturer's data sheets to get the values. \$\endgroup\$
    – Andy aka
    Commented Mar 1, 2016 at 10:06

1 Answer 1


Since the leads are connected to each other at the termination there is no requirement on dielectric strength between the conductors, only between the shield and the 8 leads of the cable.


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