The cable dimension calculator calculates present ranking, voltage drop and brief circuit ranking, in response to the Australia and New Zealand customary AS/NZS 3008.
See Additionally
Calculator parameters
Present carrying capability (ranking)
The present rankings are chosen from Tables 4 to 21 in AS/NZS 3008 (2009). It’s based mostly on cable kind, insulation kind and the cable set up technique.
Tables 4 to 21 are based mostly on an ambient temperature of 40°C and a floor temperature of 25°C.
The cable sizing calculator helps the next conductors:
Versatile cables should not supported but.
Present derating
Voltage drop calculation: – “j calc”
The one part AC voltage drop is calculated as:
(V_{d1phi}=dfrac{I L (2 Z_c)}{1000})
The place I is the load present, L is the space, and (Z_c) is the cable impedance in O/km.
The three part AC voltage drop is calculated as:
(V_{d3phi}=dfrac{I L (sqrt{3}Z_c)}{1000}).
The impedance is calculated as: (Z_c = SQRT(R_c^2 + X_c^2)).
This technique calculates the impedance for the more serious case energy issue, i.e. when the cable and cargo energy issue is similar.
The cable sizing calculator makes use of the resistance (R_c) from Desk 35 in AS/NZS 3008 at 75°C .
The reactance for single core cables is chosen from the flat, touching column in from Desk 30 in AS/NZS 3008. That is the more serious case state of affairs.
The reactance for multi-core core cables is chosen from the round conductors column in from Desk 30 in AS/NZS 3008. That is the more serious case state of affairs.
Brief circuit calculation
The brief circuit capability of the cables is calculated in response to AS/NZS 3008 as:
(I^2t = Okay^2S^2)
The place:
Okay It’s based mostly on the insulation materials, preliminary conductor temperature and ultimate conductor temperature.
A worth of 111 is used for PVC cables, 143 is used for XLPE 90 diploma cables, and 132 is used for XLPE 110 diploma cables.
The calculator assumes that the preliminary conductor temperature is the utmost allowable working temperature for the insulation kind, i.e. 75°C for PVC, and 90°C for XLPE 90°C, and 110°C for XLPE 110°C.
The utmost allowable brief circuit temperature from Desk 53 in AS/NZS 3008 is used as the ultimate conductor temperature i.e. 160°C for PVC and 250°C for XLPE.
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