For the radial distribution system shown below, the available utility short circuit duty is: 10 kA at the 12.47 kV bus, X/R = 15. The 12.47 kV / 480 V transformer is rated for 1500 kVA, %Z = 6%, X/R = 40. The short cable impedance is: 0.001+j0.0142. Size the MCCB for a) continuous current (IEEE Std. 1015-2006, Table 3-11) and b) interrupting rating (based on a 3-phase fault at the end of the short cable). (IEEE Std. 1015-2006, Table 3-25). Use a base kVA of 1500. %3D MCCB CABLE UTILITY

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For the radial distribution system shown below, the available utility short
circuit duty is: 10 kA at the 12.47 kV bus, X/R = 15. The 12.47 kV / 480 V transformer is
rated for 1500 kVA, %Z = 6%, X/R = 40. The short cable impedance is: 0.001+j0.0142.
Size the MCCB for a) continuous current (IEEE Std. 1015-2006, Table 3-11) and b)
interrupting rating (based on a 3-phase fault at the end of the short cable). (IEEE Std.
1015-2006, Table 3-25). Use a base kVA of 1500.
MCCB
CABLE
UTILITY
CS Scanned with CamScanner
Transcribed Image Text:For the radial distribution system shown below, the available utility short circuit duty is: 10 kA at the 12.47 kV bus, X/R = 15. The 12.47 kV / 480 V transformer is rated for 1500 kVA, %Z = 6%, X/R = 40. The short cable impedance is: 0.001+j0.0142. Size the MCCB for a) continuous current (IEEE Std. 1015-2006, Table 3-11) and b) interrupting rating (based on a 3-phase fault at the end of the short cable). (IEEE Std. 1015-2006, Table 3-25). Use a base kVA of 1500. MCCB CABLE UTILITY CS Scanned with CamScanner
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