Depends on size of transformer and type (dry,mineral oil, silicone) as well as ground slope and building construction.
what is fire separation distance
The transformer enclosure should isolate the transformer sufficiently from the environment. I believe OSHA specifies 2 feet, 1 inch as the minimum appoach distance to 13.8kV, so I suppose a transformer could be put this close to a building and still be safe. My guess is there are codes in place in your local area that prevent this and specify some greater distance.
Distance is a measure of separation of bodies in space. It is also the separation of two places on the surface of a body.
Spatial distance is the separation between various objects.
Distance.
William Stanley designed the first commercial transformer for Westinghouse in 1886.
william stanley jr
Distance, separation, displacement.
Mass and distance of separation.
"Separation," in terms of aircraft, is the minimum distance, both laterally and vertically, permitted in order to be considered "safe." In other words, "separation" is the distance between aircraft in all directions. If a flight is maneuvered for "separation," it is simply being turned in a direction that puts more distance between it and other aircraft.
In most countries there are building regulations that lay down the required separation, and they might differ from one country to another.
100meter