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All underground cables have relatively high values of capacitance, due to the close proximity of their cores and earthed (grounded) metallic sheath. Manufacturers provide data for their cables, which express their capacitance in terms of capacitance per unit length, e.g. microfarads per metre.

Certain categories of underground cable-fault can be located by measuring the capacitance (using an appropriate bridge circuit) of the healthy section of the cable then, having determined the capacitance per unit length for that type of cable, measuring-off the distance along the cable route to the fault position.

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How do you calculate the size of cable for 1000kw generator?

To calculate the size of cable for a 1000kW generator, you need to consider the generator's voltage and the distance the cable will run. You will need to calculate the current the generator will draw at full load using the formula: Current (A) = Power (W) / (Voltage (V) x Power Factor). Once you have the current value, you can use it to determine the appropriate cable size based on the current carrying capacity of different cable types, factoring in voltage drop considerations for the distance the cable will run.


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In order to determine proper gauge of welding cable you must first determine how long the distance you will need in cable, the entire length for both electrode side as well as work clamp side, and you also need to know the amperage you will be using. Once you determine this there are various references online and offline, most commonly in the owners manual to most welding machines, that will give you the proper size based on the amperage and total length. there are a few different factors in determining the size of welding cable you use. Thickness of base metal, distance from machine to worksite, and amperage. I am a welder in the navy and sometimes we run our leads over far distances therefore we need a bigger welding lead to handle the increase in amperage to maintain the proper work temperature. There may be more reasons for using a bigger cable but I am not sure.


How do I calculate the exstension in a steel cable that is 8 metres long and has a 500kg weight on it. The Young's modulus of the steel is 210 GPa and the diameter is 7.2mm?

In order to calculate the extension of the cable we must first calculate the strain. Strain is related to Young's modulus using the following relation:E = σA / εAWhere:E = Young's ModulusσA = Axial StressεA = Axial StrainTherefore to calculate the strain, we must first calculate the axial stress in the cable:σA = Force / AreaThe cross sectional area (CSA) of the cable is equal to:CSA = (pi(d2))/4 = pi x r2CSA = pi(0.0036)2CSA = 4.0715x10-5 m2Axial Stress = (500 x 9.81) / 4.0715x10-5σA = 120471449.98 PaAxial Stress = 120.47144998 MPaStrain of cable (εA) = Axial Stress / Young's ModulusεA = 120.471x106 / 210x109εA = 5.736735713x10-4To calculate the extension of the cable:εA = Extension / Original LengthTherefore:Extension = εA x Original Length= 0.0045893885704 m≈ 4.6 mm of extension.

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