P4802ACMC datasheet(140/212 Pages) TECCOR

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UL 60950 3rd Edition (formerly UL 1950, 3rd edition)

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SIDACtor® Data Book and Design Guide

UL 60950 3rd Edition

(formerly UL 1950, 3rd edition)

After the divestiture of the AT&T/Bell system, the National Electric Code (NEC)

implemented Article 800-4, which mandates that “all equipment intended for connection to

the public telephone network be listed for that purpose” in order to ensure electrical safety.

A manufacturer can meet this requirement by listing their product with Underwriters

Laboratories under UL 60950 (based on IEC 60950, 3rd edition).

NEC requires all telecommunication wiring that enters a building to pass through a primary

protector, which is designed to limit AC transients in excess of 600 V rms. These transients

are due to the fact that telephone lines run in close proximity to AC power lines. Most

telecommunication equipment uses a secondary overvoltage protector such as the

SIDACtor device. The secondary devices typically limit transients in excess of 350 V rms.

Therefore, a potentially dangerous condition exists because of the voltage threshold

difference of the primary protector and the secondary protector. To minimize this danger,

compliance with UL 60950 overvoltage tests is required.

UL 60950 covers equipment with a rated voltage (primary power voltage) not exceeding

600 V and equipment designed to be installed in accordance with NEC NFPA 70. This

standard does not apply to air-conditioning equipment, fire detection equipment, power

supply systems, or transformers.

The effective date of UL 60950 allows new products submitted through April 1, 2003 to be

evaluated using the requirements of either UL 60950 or UL 1950, 3rd edition. After April 1,

2003, all new product submittals must be evaluated using only UL 60950.

Products certified by UL to requirements of UL 1459 prior to April 1, 2000 may continue to

be certified without further reinvestigation until April 1, 2005, provided no significant

changes or revisions are made to the products. Products certified by UL to requirements of

UL 1950 3rd edition prior to April 1, 2003 may continue to be certified without further

reinvestigation until April 1, 2005.

In order to have the UL Mark applied after April 1, 2005, all products, including those

previously certified by UL, must comply with UL 60950.

UL 69050 is intended to prevent injury or harm due to electrical shock, energy hazards, fire,

heat hazards, mechanical hazards, radiation hazards, and chemical hazards.

It defines three classes of equipment:

• Class 1 — protection achieved by basic insulation

• Class 2 — protection achieved by double or reinforced insulation

• Class 3 — protection relying upon supply from SELV circuits (voltages up to 40 V peak

or 60 V dc)

UL 60950 also defines five categories of insulation:

• Functional

• Basic

• Supplementary

• Reinforced

• Double

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