The existing 480V breaker is 200A. Also tell me what size conductor and conduit size is required.
2007-02-09 13:36:15 · 4 answers · asked by tinandy 2 in Science & Mathematics ➔ Engineering
You need a 480V/120V Delta-Star(Dyn11) Step Down Transformer.
Using formula for 3 phase power
Power(kW)=1.732 x Voltage(kV) x Amps x cos phi(0.8)
The total connected load in kW is 133 kW as is evident from the breaker rating on 480V side.
The breaker rating at 120V -Y Side will be 800A.
The conduit size will be 2 runs of 500 sq.mm Aluminium conductor or 400 sq.mm copper conductor,PVC insulated and sheathed,armoured at the Low Voltage side of the transformer.
2007-02-09 15:49:44 · answer #1 · answered by Anirban RoyChoudhury 2 · 1⤊ 0⤋
The type of transformer should be a oil field transformer. The Characteristics is a step down transformer for one leg phase and ground. The out put on a secondary is single phase 120V phase and neutral and life safety ground. Minimum 8 Gauge to the primary, 12 Gauge secondary.
2007-02-09 22:40:54 · answer #2 · answered by John P 2 · 0⤊ 0⤋
the requirements would depend on more specifics of the load-----120volts single phase? how many amps/watts
2007-02-09 22:16:32 · answer #3 · answered by ryan b 2 · 0⤊ 0⤋
you messing with vicious power, dont kill your self
2007-02-09 21:43:47 · answer #4 · answered by robert c 3 · 1⤊ 0⤋