United power system and isolated power systems. Relay protection and automation. Requirements for the operation of relay protection devices for power transmission lines at voltage level 110 kV and higher in transient modes that come amid saturation of current transformers
Reciprocating internal combustion engines. Safety requirements for design and construction of engines for use in potentially explosive atmospheres. Part 2. Group I engines for use in underground workings susceptible to fired amp and/or combustible dust
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