BS EN 61857-21 is a European standard that addresses a specific test object and/or application with an associated test procedure.
BS EN 61857-21 is a guide on a general consideration of the use of a general-purpose model and a tall channel alternative model. BS EN 61857-21 provides a guideline for the evaluation of wire-wound electrical insulation systems. In this guideline, specific electrotechnical products are not available or required.
BS EN 61857-21 on procedures for thermal evaluation is useful for:
High-power wire-wound resistors have the following advantages: high blocking precision, low noise during operation, stability and dependability, low-temperature coefficient, can endure high temperatures and can work normally at 170 degrees Celsius.
BS EN 61857-21 guidelines can be used by manufacturers and engineers to terminate for safety purposes. Using BS EN 61857-21 best practice guidance, ensures quality assurance and the safety of the user.EN 61857-21:2009
IEC 61857-21:2009