British Standards Document
BS EN 50464-1
Three-phase oil-immersed distribution transformers 50 Hz, from 50 kVA to 2 500 kVA with highest voltage for equipment not exceeding 36 kV. General requirements

https://doi.org/10.3403/30154063U

BS EN 50464-1 is maintained by PEL/14. The current release of this standard is:

BS EN 50464-1:2007+A1:2012 Three-phase oil-immersed distribution transformers 50 Hz, from 50 kVA to 2 500 kVA with highest voltage for equipment not exceeding 36 kV. General requirements

https://doi.org/10.3403/30154063 (published 31/07/2007)

This standard is available from the following sources:

Other historical versions of this standard document also exist:

BS EN 50464-1:2007 [current until 01/10/2014]