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Why is current rating for multicore cable lower than single core with the same cross section?
Current carrying capacity of 28 AWG wire?220V AC power cable max currentMaximum current for a single-core cable?Why is it dangerous use a coiled extension cordcable size vs current ratingLVDS cable between a camera and a FPGAIs it electrically safe to use an ATX PSU's PCI output for SATA/MOLEX instead of graphics cards?What is the best metal to use for lead acid battery cables?How can this 2xmolex -> pci 8pin be so terrible?In a DC circuit with one battery and one resistor, why does the voltage drop remain the same irrespective of the value of the resistor?
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$begingroup$
As per this resource, a single core 10 AWG (5.3 mm2) copper cable is rated for up to 52 amps, while the same cross section cable of 43 cores and more is only allowed to carry up to 15 amps.
Why is that? Why do multiple cores make it more dangerous to carry the same current?
current cables conductivity
asked 4 hours ago
GreendrakeGreendrake
21218
$endgroup$
add a comment |
$begingroup$
As per this resource, a single core 10 AWG (5.3 mm2) copper cable is rated for up to 52 amps, while the same cross section cable of 43 cores and more is only allowed to carry up to 15 amps.
Why is that? Why do multiple cores make it more dangerous to carry the same current?
current cables conductivity
asked 4 hours ago
GreendrakeGreendrake
21218
$endgroup$
$begingroup$
heat removal is less, for the multi-core.
$endgroup$
– analogsystemsrf
4 hours ago
1
$begingroup$
@analogsystemsrf That would make sense if the cores were individually insulated. But they are normally just bare metal wires in contact with each other.
$endgroup$
– Greendrake
4 hours ago
1
$begingroup$
See if this can help: Circle packing
$endgroup$
– Vladimir Cravero
4 hours ago
add a comment |
$begingroup$
As per this resource, a single core 10 AWG (5.3 mm2) copper cable is rated for up to 52 amps, while the same cross section cable of 43 cores and more is only allowed to carry up to 15 amps.
Why is that? Why do multiple cores make it more dangerous to carry the same current?
current cables conductivity
asked 4 hours ago
GreendrakeGreendrake
21218
$endgroup$
As per this resource, a single core 10 AWG (5.3 mm2) copper cable is rated for up to 52 amps, while the same cross section cable of 43 cores and more is only allowed to carry up to 15 amps.
Why is that? Why do multiple cores make it more dangerous to carry the same current?
current cables conductivity
current cables conductivity
asked 4 hours ago
GreendrakeGreendrake
21218
asked 4 hours ago
GreendrakeGreendrake
21218
asked 4 hours ago
GreendrakeGreendrake
21218
asked 4 hours ago
GreendrakeGreendrake
21218
asked 4 hours ago
GreendrakeGreendrake
21218
21218
$begingroup$
heat removal is less, for the multi-core.
$endgroup$
– analogsystemsrf
4 hours ago
1
$begingroup$
@analogsystemsrf That would make sense if the cores were individually insulated. But they are normally just bare metal wires in contact with each other.
$endgroup$
– Greendrake
4 hours ago
1
$begingroup$
See if this can help: Circle packing
$endgroup$
– Vladimir Cravero
4 hours ago
add a comment |
$begingroup$
heat removal is less, for the multi-core.
$endgroup$
– analogsystemsrf
4 hours ago
1
$begingroup$
@analogsystemsrf That would make sense if the cores were individually insulated. But they are normally just bare metal wires in contact with each other.
$endgroup$
– Greendrake
4 hours ago
1
$begingroup$
See if this can help: Circle packing
$endgroup$
– Vladimir Cravero
4 hours ago
$begingroup$
heat removal is less, for the multi-core.
$endgroup$
– analogsystemsrf
4 hours ago
$begingroup$
heat removal is less, for the multi-core.
$endgroup$
– analogsystemsrf
4 hours ago
1
1
$begingroup$
@analogsystemsrf That would make sense if the cores were individually insulated. But they are normally just bare metal wires in contact with each other.
$endgroup$
– Greendrake
4 hours ago
$begingroup$
@analogsystemsrf That would make sense if the cores were individually insulated. But they are normally just bare metal wires in contact with each other.
$endgroup$
– Greendrake
4 hours ago
1
1
$begingroup$
See if this can help: Circle packing
$endgroup$
– Vladimir Cravero
4 hours ago
$begingroup$
See if this can help: Circle packing
$endgroup$
– Vladimir Cravero
4 hours ago
add a comment |
1 Answer
1
active
oldest
votes
$begingroup$
The limitation of the amount of current carried by a wire is about its ability to remove heat from the current carrying areas.
In a single strand wire the wire is heated by the current flowing through it. This heat is removed through solid copper to the outside of the wire.
In a central strand of a multi strand wire the heat has to go through the contact area between the strands or the air gaps between the strands to get out of the wire.
This results in the inside strands getting much hotter than the outside strands giving a lower current rating.
answered 1 hour ago
RoyCRoyC
5,18331531
$endgroup$
add a comment |
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1 Answer
1
active
oldest
votes
1 Answer
1
active
oldest
votes
active
oldest
votes
active
oldest
votes
$begingroup$
The limitation of the amount of current carried by a wire is about its ability to remove heat from the current carrying areas.
In a single strand wire the wire is heated by the current flowing through it. This heat is removed through solid copper to the outside of the wire.
In a central strand of a multi strand wire the heat has to go through the contact area between the strands or the air gaps between the strands to get out of the wire.
This results in the inside strands getting much hotter than the outside strands giving a lower current rating.
answered 1 hour ago
RoyCRoyC
5,18331531
$endgroup$
add a comment |
$begingroup$
The limitation of the amount of current carried by a wire is about its ability to remove heat from the current carrying areas.
In a single strand wire the wire is heated by the current flowing through it. This heat is removed through solid copper to the outside of the wire.
In a central strand of a multi strand wire the heat has to go through the contact area between the strands or the air gaps between the strands to get out of the wire.
This results in the inside strands getting much hotter than the outside strands giving a lower current rating.
answered 1 hour ago
RoyCRoyC
5,18331531
$endgroup$
add a comment |
$begingroup$
The limitation of the amount of current carried by a wire is about its ability to remove heat from the current carrying areas.
In a single strand wire the wire is heated by the current flowing through it. This heat is removed through solid copper to the outside of the wire.
In a central strand of a multi strand wire the heat has to go through the contact area between the strands or the air gaps between the strands to get out of the wire.
This results in the inside strands getting much hotter than the outside strands giving a lower current rating.
answered 1 hour ago
RoyCRoyC
5,18331531
$endgroup$
The limitation of the amount of current carried by a wire is about its ability to remove heat from the current carrying areas.
In a single strand wire the wire is heated by the current flowing through it. This heat is removed through solid copper to the outside of the wire.
In a central strand of a multi strand wire the heat has to go through the contact area between the strands or the air gaps between the strands to get out of the wire.
This results in the inside strands getting much hotter than the outside strands giving a lower current rating.
answered 1 hour ago
RoyCRoyC
5,18331531
answered 1 hour ago
RoyCRoyC
5,18331531
answered 1 hour ago
RoyCRoyC
5,18331531
answered 1 hour ago
RoyCRoyC
5,18331531
5,18331531
add a comment |
add a comment |
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$begingroup$
heat removal is less, for the multi-core.
$endgroup$
– analogsystemsrf
4 hours ago
1
$begingroup$
@analogsystemsrf That would make sense if the cores were individually insulated. But they are normally just bare metal wires in contact with each other.
$endgroup$
– Greendrake
4 hours ago
1
$begingroup$
See if this can help: Circle packing
$endgroup$
– Vladimir Cravero
4 hours ago