UL 122701:2021 PDF Download

UL 122701:2021 is a standard that specifies the requirements for process sealing between electrical systems and flammable or combustible process fluids. The purpose of this standard is to prevent the migration of process fluids directly into the electrical system, which could lead to hazardous situations.

The standard distinguishes between flammable and combustible liquids based on their flashpoints. It also takes into account the formation of flammable mists and aerosols that can occur under conditions of elevated pressure and/or temperature. These mists and aerosols are included within the scope of the standard.

The document outlines requirements for the construction and testing of three types of equipment: single seal equipment, dual seal equipment, and add-on secondary seals. These requirements ensure the reliability and effectiveness of the process seals.

It is important to note that UL 122701:2021 does not cover the additional requirements for electrical conduit and cable seals, which are addressed in separate standards such as UL 1203 and UL 2225. The standard also does not address the basic electrical safety and explosion protection requirements, although these may be applicable to the equipment under investigation. Additionally, the secondary effects of leakage to the environment are not addressed in this standard.