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The Code (I'm referring to the IBC) has very specific and extensive requirements for a true "fire wall" but I doubt any kind of substation will need a Fire Wall.
NFPA said:Fire protection for oil-insulated outdoor type transformers
It is strongly recommended that any oil-insulated outdoor type transformer containing 500 gal (1890 liters) or more of oil is separated from nearby structures by a 2-hour–rated firewall or by specific spatial separation in accordance with NFPA 850 recommendations.
Wherever a firewall is installed between transformers (please refer to the picture below), it should extend at least 1 ft (0.31 m) above the top of the transformer shell and oil tank and at least 2 ft (0.61 m) beyond the width of the transformer and cooling radiators.
Fire protection for indoor transformers
Dry-type transformers are strongly preferred for use inside buildings. In case however, an oil-insulated transformer is installed indoors, then if its oil content exceeds 100 gal (379 liters), then it should beseparated from nearby areas by a fire barrier of 3-hour fire resistance rating. In case an automatic fire extinguishment system is installed, then it is allowed that the fire restistance rating of the fire barrier is reduced to 1 hour.
Construction materials for power plants
With the exception of roof materials, materials used in critical buildings of the power block shall be either non combustible or limited combustible. Roof covering is recommended to be be Class A, in compliance with NFPA 256, whereas metal roof deck construction, should be either “Class I” or “fire classified.”
retired13 said:A search, on the pictures contained through the link provided, yields this article "Fire protection for power plants (NFPA 850)". THe things concerning you are extracted below for your convenience.
SKJ25POL said:...what can we do for the "fire wall" to make it more resistant compare to the normal(non fire resistant) walls?