All Questions
12
questions
1
vote
2
answers
244
views
Calculation of the cross section of the busbar in the switchgear
To calculate the cross-sectional area of the copper busbar, it is necessary to calculate the permissible current of the busbar.
One of the correction coefficients that must be multiplied in this ...
- 13
4
votes
2
answers
208
views
Determination of temperature rise - Deviation of ± 5 K
I was referring IEC 61439-1 standard for the deriving the temperature rise of an assembly through comparison. We can derive the current rating of an assembly (low voltage switchboard) at any point (...
- 327
-1
votes
2
answers
288
views
Why is the magnetic field not blocked by the copper wires in a current transformer?
When I want to protect an electronic board from a magnetic field generated by a transformer, I put a circle of vias (as a jail grid) connected to GND planes to stop the magnetic field.
How does a ...
- 37
1
vote
1
answer
466
views
Fixing corroded contact surfaces on PCB
Looking at a Seagate HDD that no longer connects. The motor is running, but does not show in devices. The disk has production date is 12361 (2012-03-05).
Before having a look inside I checked out the ...
- 13
0
votes
2
answers
1k
views
Would a square piece of copper have a similar maximum current rating as a copper wire?
If I have a 3mm x 3mm x 3mm piece of copper that conducts a DC current, is there a way to determine its maximum safe current?
I looked into here,
and found information for copper wires, shown below.
...
- 713
0
votes
2
answers
224
views
Current carrying cable/busbar cooling ways in an aircraft
For an aircraft has an altitude 35000 feet, what'd it have to cool its cables/copper busbars up? High altitude means lower air density and it means lower oxygen, convection doesn't make sense and if I ...
- 21
-4
votes
2
answers
938
views
Copper wire thickness
What diameter copper wire (single core, not isolated, open air) is needed to safely conduct 120A current from 22.2V battery to a load on 30cm distance?
Of course I searched on the Internet and there ...
- 543
2
votes
3
answers
10k
views
Can electrical wires be ruined by overheating?
I have a friend that works with automotive mechanical sorts of things, and he told me that he had a pair of jumper cables that was ruined by too much current; it wasn't that the insulation melted: he ...
- 23
0
votes
2
answers
639
views
Current carrying conductor axially through a copper ring
What effect would a copper ring around a current carrying conductor have on the current in the conductor? How can I go about mathematically modelling the current in the conductor?
Details : The ...
0
votes
1
answer
3k
views
about power supply on what length of copper wire we should use
Could you help me on the equivalent current of three phase alternating current having 400v( volt ), 530 kw power and the available cross-sectional area of a copper wire, its length 350 m for carring ...
- 9
6
votes
3
answers
6k
views
What would be the difference in a coil of wire and just a cylinder of solid copper?
Ok so I am learning about induction and I always see coils of wire with no insulator. So I was wondering, What is the significance of it being a coil of wire rather than just a solid cylinder since ...
- 379
19
votes
9
answers
159k
views
How do I calculate the temperature rise in a copper conductor?
If I pass a current through a copper conductor, how can I calculate how hot the conductor will get?
For example, if I have a 7.2kW load powered by 240VAC, the current will be 30A. If I transmit this ...
- 5,818