Years ago, I worked in a building on a RAAF base that had 415/240VAC 50 Hz, 115VAC 50Hz, 208/115 60Hz & 208/115VAC 400Hz (the 60 & 400 Hz came through supplied through rotary convertors). These were all disconnected in the early 1990s & only the 415/240VAC 50 Hz & 115VAC 50 Hz remains now (fed from a pair of rather large transformers under the floor-about 100 Kva each)
