Drainage protection stations of SDZ.PTM and SDZU.PTM types are designed to protect underground structures from constant stray current of electrified rail transport by changing the current distribution in the system "rail - ground - underground structure", as well as to reduce the impact of electromagnetic radiation from high-voltage sources.
Drains correspond to types of climatic execution U, UHL or XL with categories of placement 1 or 2 according to GOST 15150.
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