The UL 1581 standard was formulated by Underwriters Laboratories (UL), a safety technology company in the United States, so this standard is mainly applicable to the American and Canadian markets. Although the standard is widely used worldwide, not all countries and regions have adopted the standard as their local regulations or standards.
In other regions, there may be similar standards or codes for evaluating the combustion characteristics of wire and cable insulation materials. For example, the International Electrotechnical Commission (IEC) publishes a number of standards for wires and cables, including one for vertical burn tests. The European Committee for Standardization (CEN) and the European Committee for Electrotechnical Standardization (CENELEC) also publish a series of standards and specifications related to wires and cables, including standards on combustion testing. Therefore, which standard to adopt depends on the regulations of different countries and regions and the requirements of standardization organizations.
It should be noted that although different standards may have certain differences, they generally have a similar purpose, which is to evaluate the combustion characteristics of wires and cables to ensure that they have adequate fire performance. Therefore, when formulating or selecting standards, it is necessary to consider the market and application field to ensure compliance with local regulations and standards.