Transformers of ОС series comply with the requirements of GOST Р52719-2007. In terms of the method of protection against electric-shock hazard the transformers are referred to class I pursuant to GOST 12.2.007.0-75 and its protection degree is IP00 pursuant to GOST 14254-2015. Types of climatic category - УЗ, УХЛЗ pursuant to GOST 15150-69. Temperature class of insulation is B, F pursuant to GOST 8865-93. Transformer version in terms of the installation conditions on the operation site - built-in, they can be installed both horizontally and vertically (at the customer's request). Connection circuit and group - 1/1-0. Transformers of ОСЗ type - related to the protected version (protection degree is IP21).
Transformers are designed for indoor operation.
Height above sea level should not exceed 1000 m.
Ambient temperature should range from -45 °C to +40 °C.
The environment should be non-explosive.
Relative humidity at +25°C should not exceed 80%.
Power network frequency makes 50 Hz.