NEMA HV 3-2019描述了高压绝缘子采购商和供应商为确保提供始终如一、可靠的优质高压绝缘子而采取的最佳实践。本指南旨在为负责指定和购买高压绝缘子的人员提供帮助，以确定最适合其特定应用和服务条件的最佳质量绝缘子，这些绝缘子能够持续可靠地供应。

NEMA HV 3-2019 describes best practices on the part of purchasers and suppliers of high voltage insulators toward assuring a consistent and reliable supply of best quality high voltage insulators. It is the intent of these guidelines to provide assistance to those responsible for specifying and purchasing high voltage insulators to identify those best quality insulators most suitable for their specific application and service conditions which can be consistently and reliably supplied.