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Learn how to calculate various (cable size, maximum demand, earth loop impedence, short circuit calculations, etc.) components ...
of an electrical installation.
Tags:How to Calculate Cable Size,cable calculations,cable size,circuit design,control wiring,earth loop impedence,electrical software,estimating program,maximum demand,power factor correction,voltage drop
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What we’re going to do is simple cable calculation using cable calc’s in solutions electrical software. First of which is a phases or number of phases, in this case we’ll use single phase. So simply give that cable an ID and it could be a number nine call it whatever you like and in that case so called nines. Now, you can have some additional info in here as well. I’ll call this office. I’ll go down further, your cable type, conducted type or we’re going to use Copper or Aluminum, we’ll just stick with copper. The voltage is 230 volts, permissible voltage drop on this particular circuit is 2.5%. But relying to that cable length we make that 47 meters the de-rating factor of one.
Up further the load in kilowatts or amps will select we say 87 amps. A cable type we’ll choose XLPE will it be singles or multi core, I would imagine in this case it will be singles. They have a little cable be installed. It will be above there, spaced, touching and conduit or partial insulated. Options of buried direct below ground or buried enclosed and also we have the option of aerial cables. We’ll select partial insulated, get three some ceilings and wall cavities.
Now actually measure what the program needs to calculate the size of the cable so it’s cable here and click calculate. We’ve been given a 35 millimeter squared cable. Let’s write it at 120 amps. A voltage drop of 5.29 volts at 2.3%, the cables do write it to 120 amps because it will be running out of time, maximum length of run here is 51 meters, you’ve seen length selected 47 meters over here.
Running at the ID 87.00 amps full live. The fault level of 5005 amps that’s the current that the conductive will actually handle and default conditions for one second before the insulation will actually break down.
The running temperature of full live will be 66.3oC, the second bracket size is 100 amps. From here we can also go on and calculate the earth loop impedance so we’ll just click on this one and you’ll see up here is going to stay at 35 no cable, one core in parallel. To choose circuit protection using we will use a circuit breaker, type C circuit breaker with a trip time of 0.4 seconds. It’s given us one fault conductor in parallel and that size happens to be 10.0 mm2 and copper of course.
Forty seven meters is the length thereon. So that’s the length and measure as well. We’ll just calculate on here and all your results displayed on this page makes my length to run but we can also close this page up and they’ll sign details will be relayed down here below the cable calculation result. And that’s how easy it is.