An x-ray equipment needs to be installed in one medical office. The existing ele

Question

An x-ray equipment needs to be installed in one medical office. The existing electrical service at the site is 600A, 120/208V 3phase 4 wire. Rating of X-Ray equipment is as following: 480V, 3 phase 3 wire, 50Amp continuous load. What is required transformer size(KVA) in order to serve X-Ray equipment? (Verify available standard rating of transformer with manufacturer catalogue.) Indicate current(amp) at secondary of transformer. What is the dimensions and weight of proposed transformer? (utilize GE, Square-D or Siemens websites)

Explanation / Answer

Rated OUT PUT kVA is S = 1.732*480*50 = 41.569 kVA

Required 3-phase transformer is 45 kVA , Y-Detla , 208:480 .

This is because utility service is 3-phase , 4-wire and line-line voltage is 208 V and output X-ray equipment is 3-phase , 3-wire with line-line voltage of 480 V.

----> Secondary side Voltage is 480 V and Current is 54.12 A

----> Dimensions 20 INCH W * 20 INCH D * 30 INCH H and Weight 368 LB

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