UL - 60950-1 (ND)
National Differences For UL 60950-1 Information Technology Equipment - Safety - Part 1: General Requirements
|Publication Date:||27 March 2007|
This document provides a single listing of the technical National Differences included in the UL adoption of the corresponding IEC standard. Editorial National Differences (those marked DE) are not included in this technical compilation.
In its IEC-based standards, UL uses the notations indicated below to identify national difference type, and these types are additionally noted in this document. The standard may not use all types of these deviations.
DR - These are differences based on the National Electrical Code (NEC) and other U.S. Regulatory Requirements.
D1 - These are differences which are based on basic safety principles and requirements, elimination of which would compromise safety for U.S. consumers and users of products. Requirements related to these National Differences are based on North American regulatory requirements and are specified in Annex NAE.
D2 - These are differences based on safety practices. These are differences for IEC requirements that may be acceptable, but adopting the IEC requirements would require considerable retesting or redesign on the manufacturer's part. Some of these National Differences are Markings and Instructions Requirements and are specified in Annex NAA.
D3 - These are national differences based on bi-national requirements which result in less stringent requirements than in IEC 60950-1.
DC - These are differences based on the component standards and will not be deleted until a particular component standard is harmonized with the IEC component standard. Component requirements for these deviations are specified in Annexes P.1 and P.2.
DE - These are differences based on editorial comments or corrections.