DISTANCE BETWEEN TWO TRANSFORMERS

[Elecme]

Could anyone help identify the minimum distance required between two transformers (for two oil filled transformers and for teo dry type transformers). Please mention some reference from IEC or IEEE or NFPA.

Thanks, Elecme

 

[redtrumpet]

From the fire spread and prevention standpoint, the following guidelines are from IEEE 979 for liquid-filled transformers. You really should buy the standard, as I am technically infringing IEEE copyright by telling you this:

7571 liters or more of oil - 20 feet from building, if 20-50 feet from building, the exposed walls of the building should have a 2 hour fire barrier.

75 kVA or less - 10 feet from building.
76-333 kVA - 20 feet from building.
More than 333 kVA - 30 feet from building.

Add fire barriers if above minimums aren't maintained.

Large oil-filled transformers should be separated by at least 30 feet of clear space and/or a minimum 1 hour fire rated barrier.

 

[Elecme]

Thanks, I have had a look to IEEE 979. This is reelated to outdoor transformer installations.
Do you have any reference for indoor installations, I mean the distance between transformers in indoor substations for 2000kVA and less oil/ dry type transformers. Elecme