BySusi4
Eine Freiliegende Kupferleitung ohne einen Schutz bzw.. Mantelschutz / Plastikschutz von außen . Meine frage ist: Erhöht sich da die Stromtragfähigkeit ?
(1 votes)
Loading...Hallo ich brauch unbedingt bei der Aufgabe, der Motor von einer Torsteuerung soll mit hilfe einer Wendeschützschaltung angesteuert werden. Dabei soll kein direktes Wenden möglich sein. Nachdem das Tor ganz geöffnet ist, wird der Endschalter B1 betätigt. Ist das Tor zugefahren, soll B2 betätig sein. Der Stopp-schalter beendet die Torfahrt.
Hi ich weiß das man eigentlich eine 1,5qmm Leitung nur bis 38m legen darf aber warum wird auf eine Kabeltrommel 50m gewickelt? Danke im Voraus
Hallöchen, Ich habe eine Lichterkette die mit Batterien funktioniert an mein Regal befestigt. Kann sie auch über die ganze Nacht leuchten oder ist das eher eine schlechte Idee? Danke für die Antworten im Vorraus!
Siehe Frage im Titel. Danke im Vorraus
Hallo Wollte meinen Bollerwagen motorbetrieben machen und hab mir jz einen 48v dc motor geholt mit 500w maximalleistung. Zwischen batterie und motor packe ich auf jeden Fall einen Stromregulator. Sonst habe ich immer (bei gleicher Spannung) Kabel direkt miteinander verlötet aber jetzt bin ich ein bißchen verwirrt ob das so glattläuft. LG
“Electric capacity”? You mean the conductivity? And no, it doesn’t change, why? By means of insulation, nothing is changed at the metal, which increases its resistance.
Edit: Thought it was about copper pipes in “household size”. There is no significant difference in the case of corresponding services, whether the line is insulated or not. In the case of overland lines, this is of course another house number, although they do not consist of copper like the laying lines in buildings. These are special alloys. And in the case of copper rails in industry and in many electrical distributions, insulation is omitted only for cost reasons and simpler installation. There is less reason for the current load capacity.
Current carrying capacity is the maximum current of the line.
Depending on the conductivity, this is the thermal load on the line, the permissible maximum temperature of the line of cooling of the line.
Aah, that is, the current loadability that is determined with the type of laying, accumulation, cross section and load? This is only a theoretically defined maximum value to comply with directives and not a physical limit. Thought it was about how well the copper can conduct electricity.
I know how to calculate lines, I finally learned the bums. However, a NYM line will never be 90 degrees warm when I go to the limit of what the line bill tells me. After all, for example, in the case of socket circuits, 16A is also calculated. Let me see a power outlet with a permanent 16A. In addition, there is also the simultaneous factor that you like to leave.
So far I had a single construction site where we really laid cross sections strictly according to line calculation. The electric planner had seemingly powerful fun with its cross-sectional table. This went so far that we should pull a 6mm2 for a bite of plaster can on a concrete column. 6mm2… in a Schuko socket… And maybe 40m cable length. Just because somewhere on the way there all the cables led through ne insulated wall and the accumulation and laying type on this 20cm shot the calculation in height. Completely clumped and far away.
Well, it depends on how exactly you know the parameters. In the case of household cabling and standards, you have certain uncertainties and therefore neat security factors above that nothing can happen.
If, on the other hand, you know exactly where your boundaries are and these are well known in the product or in the plant, you can also keep this security smaller.
The permissible limit for standard PVC lines is 90°C.
Yeah, I got it. However, these calculated values are far from the line dimension. I have already seen cable laying in industry and industry, in which each cross-sectional table fan would strike the hands over the head and still works. :
Well, there’s a physical limit. If the copper or the insulation melts.
The directives are also derived from these limits.
Especially it is cheaper! Finally, it is about materials in ton scale!
No insulator, no labor, no instant posture, less load on the power poles, no technical disadvantages!
In fact, free lines are a large part of aluminum, or Aluminium alloys, because due to the low density, with only a little poorer conductivity, the load and thus the costs become even lower!
Depends on how the line is moved. When the heat dissipation from the line increases the current carrying capacity increases. It also depends on the maximum temperature of the line.
So if your line is allowed to reach 200°C, you can send more electricity than if it can reach only 100°C.
Of course, other standards can limit this again, for example the maximum voltage drop on the line.
Generally, however, unprotected copper is not necessarily suitable for this. There should be corrosion protection.
“Electric capacity” I’ll take you Electrical conductivity. The electrical conductivity of the conductor is not influenced by the insulation.
But without insulation, the conductor is somewhat more resilient because the ohmic heat is better guided through the resistance to the environment. The conductor thus becomes less warm, and no consideration must be given to the thermal stress of the insulation. The conductor can thus be loaded with a somewhat higher current strength at the same temperature.