From http://www.connectwell.com/testing1.htm :
>>>CTI - Comparative Tracking Index of Insulation material
The insulation material is divided into four groups according to their CTI
(Comparative Tracking Index)
¡E Insulation I : 600 CTI
¡E Insulation II : 400 CTI < 600
¡E Insulation III a : 175 CTI < 400
¡E Insulation III b : 100 CTI < 175
The Comparative Tracking Index must be defined according to DIN IEC 112/ VDE
0303 part 1 on specimens made specifically for this purpose with test
solution A. The proof-tracking index (PTI) is also used to identify the
tracking characteristics of materials. A material may be included in one of
the four groups given above on the basis that its PTI, established by the
method of IEC 112 using solution A, is equal to or greater than the lower
value specified for the Insulation group.
<<<
DIN and VDE are german standardization bodies.
Regards
Thomas
> -----Original Message-----
> From: russell (ù¯À) [mailto:[log in to unmask]]
> Sent: Thursday, September 18, 2003 4:59 AM
> Subject: Re: PTI value
>
>
> Phil,
>
> A little more research did turn up "Proof of Tracking Index"
> , so close enough. Thanks.
>
> Either name is okay, Russell is easier to write in Chinese so
> used here more.
>
> Larry Russell
>
> -----Original Message-----
> From: DUTTON Phil [mailto:[log in to unmask]]
> Sent: Thursday, September 18, 2003 10:21 AM
> To: [log in to unmask]
> Subject: Re: [TN] PTI value
>
>
> Larry,
> (sorry, called you Russell before)
> Yes, could be the same thing - an abbreviation from the
> german language.
>
> regards,
>
> Phil.
>
> -----Original Message-----
> From: [log in to unmask] [mailto:[log in to unmask]]
> Sent: Thursday, September 18, 2003 11:16 AM
> To: [log in to unmask]
> Subject: Re: [TN] PTI value
>
>
> Phil
>
> Maybe, or a typo for CTI? 250 V rating seems right.
> Curiouser.
>
> Larry Russell
>
> -----Original Message-----
> From: DUTTON Phil [mailto:[log in to unmask]]
> Sent: Thursday, September 18, 2003 9:14 AM
> To: [log in to unmask]
> Subject: Re: [TN] PTI value
>
>
> Hello Russell,
>
> I've seen CTI (Comparative Tracking Index)
> PTI may be similar (Potential Tracking Index?)
>
> Phil.
>
> -----Original Message-----
> From: [log in to unmask] [mailto:[log in to unmask]]
> Sent: Thursday, September 18, 2003 10:28 AM
> To: [log in to unmask]
> Subject: [TN] PTI value
>
>
> Techneters with European business experience,
>
> On a bid from Germany, we have been asked to keep in mind;
> ...
> layer / Lagen 2
> surface of copper / Kupferoberflache HAL
> PTI 250 V
> ...
>
> The only suitable listing I can find for PTI is Payload Type
> Identifier, which refers mainly to programing.
> I believe this means 250 volt current rating to the traces,
> but the head engineer here is uncertain.
> Does someone know this reference?
>
> Larry Russell
> www.cwi.com.tw
>
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