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Some people want to know that amount of electricity which can pass through an electric conductor. This is important information when you are considering the right size of conductors or wires to use. When you use the wrong conductor for a specific flow of electricity this could result to overheating of wires or even fires.
Ampacity is the most important aspect of conductor sizing. This is the capacity of a wire or a conductor to allow electrical flow without being destroyed. There are two major factors that affect the ampacity of a conductor and these are the current flow and the heat capacity. We will learn more about this for us to determine the ampacity of our conductor.
When you are considering the value of the electric flow, you should consider the total amount of the fault current. This is because generally when a fault occurs, the current normally splits into two branches and each of these branches will carry half of the current. This will not give you the actual capacity of the conductor and it will no t give you accurate results to make a relevant decision for sizing. Therefore you must consider the total amount of the fault current which is your RMS current as well.
You should choose the maximum temperature in accordance with the tables in the standard. The standard mentioned that the limits to be set on the conductor should not exceed melting point odf these conductors. The limit for copper is 250 C and the limit for buried conductors is about 1000C.
If you want to compute for the ampacity of a conductor quickly and easily, you should access the computer software that comes along with the CDEGS computer program. This software will perform sizing computations when you indicate the actual fault current and the maximum temperature capacity of your conductor.
On the main program of the CDEGS, you will have to select tools/ampacity. After selecting this, a set of instructions which are self explanatory will guide you in how to use this program. After going through the instructions, you will have to encode the actual fault current and the maximum heat capacity that you have determined beforehand. After putting in these limits you will now choose the conductor that you prefer to use.
You have to fill in the necessary information about the Symmetrical RMS current magnitude, and the maximum allowable temperature which you have already estimated. After indicating setting these considerations the next thing that you need to do is to choose the conductor which you prefer. After that you just need to click on the compute and the program will give you the minimum conductor size possible for given the fault current and the heat limit that you set up. You can click on the report to get more information about the ampacity of the conductor that you have chosen.
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