48 volt volta drop calculator

7/31/2019 48 Volt Volta Drop Calculator

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length

Conductor cross- sectional

area Resistance per metre run (mm) (m ohms / m)

1 18.1

1.5 12.1

2.5 7.41

4 4.61

6 3.08

10 1.83

16 1.1525 0.727

ABLE SIZE MV/A/MTR LENGTH CURRENT2.5 7.41 80 MTRS 11 10 FTTO 1.1 AMP MAX PER UNIT4 4.61 80 MTRS 11 10 FTTO6 3.08 80 MTRS 11 10 FTTO

ABLE SIZE VOLTAGE DROP2.5 6.5 FAIL4 4.1 FAIL6 2.7 OLTS DROP PASS

MAXIMUM VD TO BE LESS THAN 4 VOLTS ON 48 VOLT SYSTEM AS ADVISED BY MANUFACURER

---------------- calculation of R1 + R2


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CABLE SIZE MV/A/MTR LENGTH CURRENT2.5 7.41 70 MTRS 8.8 8 FTTO 1.1 AMP MAX PER UNIT4 4.61 70 MTRS 8.8 8 FTTO6 3.08 50 MTRS 8.8 8 FTTO

CABLE SIZE VOLTAGE DROP2.5 4.6 FAIL4 2.8 PASS6 1.355 VOLTS DROP PASS

MAXIMUM VD TO BE LESS THAN 4 VOLTS ON 48 VOLT SYSTEM AS ADVISED BY MANUFACURER

examplel = 70

I = 8.8 ampscable size = 6mm


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4/12


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6/12

1 1.12 2.23 3.34 4.45 5.56 6.67 7.78 8.89 9.9

10 1111 12.112 13.213 14.314 15.415 16.516 17.617 18.718 19.819 20.920 2221222324252627282930


7/12

31323334353637383940414243444546474849505152535455565758596061


8/12

62636465666768697071727374757677787980818283848586878889909192


9/12

93949596979899

100101102103104105


10/12

CIRCUIT REFERENCE VOLTAGE LENGTH CURRENT CONSTANT COPPER RISISTIVITY CABLE SIZE RADIAL RING1 48V DC 50 14.3 0.017 6 1 22 48V DC 50 13.2 0.017 6 1 2 30/5/20123 48V DC 50 1.1 0.017 2.5 1 2

1 c = 0.4% vd rise above 25 deg Cexample L = 50 mtr

CIRC No 1 13 FTTO 2.5 MM =total current = 8.8 amps 4.00 MM=

cable size = 4 mm sq 6.00MM=

VD at 25C = 2.025833 VD IF RING 1.0737 VDadditional temp = 15c installed

vd based at 40 C = 2.147383

terminal voltage at FTTO = 45.85262 VOLTS

0.4% = 0.00810333 VDactual voltage drop 2.147383 VOLTS

CIRC No 2 12 FTTO VD IF RING 0.9958total current = 7.7 amps installed

cable size = 4 mm sqVD at 25C = 1.87

additional temp = 15c 1vd based at 40 C = 1.99155 2

3

terminal voltage at FTTO = 46.00845 VOLTS 45

actual voltage drop 1.99155 VOLTS 67

COST SAVINGS TO TRADITIONAL INSTALL AT C3

Reduction in future maintenance costs.

Angelo Franklin

ALEC CONSTRUCTION

FORMULA USED = CABLE LTH X CURRENT USED X RISISTIVITY CONSTANT AT 25 DEG C / CROSS SECTIONAL AREA OF CABLE

CABLE RATINGS

80/85% less cables.80/85% less conduits.Reduction in containement sizes.

Reduction in distribution board sizes.

Reduction in engineering/coordination.Reduction labour costs.


11/12

1.92


12/12

1.1 52.2 103.3 154.4 205.5 256.6 30

7.7 358.8 409.9 4511 50

12.1 5513.2 6014.3 6515.4 7016.5 7517.6 80

859095

100105110115120125130

48 volt volta drop calculator

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