Transcription of Wire - rpc.com.au
1 Copper ConductorPlastic Insulation133 WireLow voltage power systems often operate at rather highcurrent levels. If the interconnecting cables are too small,a large proportion of the power available will be wasted inthe cable itself. This loss can be reduced by using a largercable, but this increases costs. The acceptable maximumvoltage drop for DC loads is 5% of nominal batteryvoltage. The chart and the formula on this page areprovided to help you in selecting the best cost / power CHART12 Voltacceptable cable size (mm )Cable length (metres)Amps1 2 5 10 15 20 25 30 1 2 3 4 5 10 15 20 25 30 40 60 80 100 125 24 Voltacceptable cable size (mm )Cable length (metres)
2 Amps1 2 5 10 15 20 25 30 1 2 3 4 5 10 15 20 25 30 40 60 80 100 125 NOTE: The Cable length in the above tables are routelength which is half the total conductor length . If thepositive and negative leads are different lengths anaverage must be taken. All the methods of determining voltage drop on this page are for DC only.
3 AC electricity behaves etric cables are specified by the copper area (in squaremillimetres), the number of strands of wire and thenumber of conductors or cores in each sheath. Thevoltage drop is the same regardless of voltage, assumingthat amps, distance and cross sectional areas are thesame. If the wattage remains the same for differentvoltages, the amps can be calculated by dividing wattsby FormulaIf you need to calculate the voltage drop under a givenset of circumstances, there is a formula by which it canbe :A = cross sectional area of cable in (mm )L = route length in metresI = current measured in ampsR = resistance of cable ( )resistance of copper = aluminium = steel = Voltage Drop = 2 x L x I x R AExample:You have a power point connected to a power route length is 8 metres.
4 If the wire is mm multi-stranded copper cable and the expected current isexpected to be 10 amps, we have:A = 5 L = 9 I = 10 R = drop can then be calculated to be volts. Ifthis figure is considered to be acceptable it would avoidspending more money on larger m per m etre30 m rollam pacity sheathedW IR-M02W IR-30215 amps sheathedW IR-M03W IR-30320 amps sheathedW IR-M05W IR-30525 amps (black or red)W IR-M 08W IR-30845 am (black or red)W IR-M 14W IR-31470 am (black or red)W IR-M 25W IR-32590 am (black or red)W IR-M 32W IR-332110 am ps49single (black or red)W IR-M 49W IR-349150 am psNOTE: The above cables are rated for extra low voltageWhat:Wir
