John -
The RTI you are referencing from IEC TC28 appears to be not
the same parameter as being discussed. In UL parlance, as
you surmised, RTI represents "Relative Temperature Index"
and gives a maximum operating temperature at which a
polymeric material may experience for its other properties
to be considered stable over the lifetime of a product.
The RTI you mention ("Relative Tracking Index") sounds
reminiscent of CTI ("Comparative Tracking Index"), where the
carbon tracking on the surface of a material is observed
between two electrodes at specified voltage(s) after the
surface is intentionally contaminated with a known
substance. Whether this comparison of RTI/CTI is valid or
not, I don't know.
Regards,
Peter L. Tarver, PE
Product Safety Manager
Sanmina Homologation Services
[email protected]
> -----Original Message-----
> From: John Woodgate
> Sent: Tuesday, October 02, 2001 10:49 PM
>
> I read in !emc-pstc that Nick Williams
> <[email protected]>, on Tue, 2 Oct 2001:
> >The straightforward answer to your question is
> that RTI is a concept
> >developed by UL and is not referred to in the EN
> standards.
>
> But nothing is ever quite straightforward in the
> standards world. Some
> product safety ENs may not mention RTI but have
> requirements based on
> other standards (those produced by IEC TC28, for
> example) that take RTI
> (Relative Tracking Index) into account. But 'RTI'
> isn't used, because
> IEC has already a term 'Relative Temperature
> Index' that is abbreviated
> RTI.
>
> --
> Regards, John Woodgate
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