NOVEMBER 2001 - REVISED FEBRUARY 2005

Specifications are subject to change without notice.

Customers should verify actual device performance in their specific applications.

TISP43xxMMAJ/BJ Overvoltage Protector Series

IEC 60950, UL 1950/60950, CSA C22.2 No. 950/60950 and EN 60950

UL 60950, Clause 6.4 – Power Cross

Figure 14 shows the criterion flow for UL 60950 power cross. (This is a modified version of UL60950, Figure 6C — Overvoltage flowchart.)

There are many routes for achieving a pass result. For discussion, each criterion has been given a letter reference. Brief details of any

electrical testing is given as a criterion note. Test pass criteria are given in the bottom table of Figure 14.

These electrical safety standards for IT (Information Technology) equipment at the customer premise use the IEC (International Electro-

technical Commission) 60950 standard as the core document. The IEC 60950 covers fundamental safety criteria such as creepage and

isolation. The connection to a telecommunication network voltage (TNV) is covered in clause 6.

Europe is harmonized by CENELEC (Comité Européen de Normalization Electro-technique) under EN 60950 (included in the Low Voltage

Directive, CE mark). Up to the end of 2000, the US had UL (Underwriters Laboratories) 1950 and Canada CSA (Canadian Standards Authority)

C22.2 No. 950. The US and Canadian standards include regional changes and additions to the IEC 60950. A major addition is the inclusion of

clause 6.6, power cross withstand containing the flowchart Figure 18b and annex NAC covering testing. Remarks made for UL 1950 will

generally be true for CSA 22.2 No. 950.

In December 2000, UL released UL 60950, which will run concurrently with UL 1950 until 2003, after which submittals can only be made for

UL 60950. The equivalent Canadian document is designated CSA C22.2 No. 60950. Changes and differences between UL 1950 and UL

60950 do not affect power cross testing nor evaluation criteria. Clause and figure numbering has changed between the standards and these

changes are shown in the table. In this document, these two standards are being jointly referred to as UL 60950 and the clause and figure

numbering referenced will be from UL 60950.

Item

UL 1950

UL 60950

Protection against overvoltage from power line crosses

Clause 6.6

Clause 6.4

Overvoltage flowchart

Figure 18b

Figure 6C