DC ampacity differs because of the AC skin effect by
Idc =3D Iac SQRT S
Where S is the skin effect ratio at 60 Hz
For your dimensions the listed attributes are:
DC Resistance (at 20 deg C in microhms per foot) 65.8
30 deg C rise Skin effect ratio 1.01
60 Hz ampacity 240
The assumed conditions are 40 deg C ambient.
All that to say the DC current you could expect is
Hope this helps.
If I understand your problem correctly you need to carry
1000 Amps and therefor should be looking at bus bars in the rage listed
3/16 x 4"
=BC x 3 =BD"
3/8 x 2 =BD"
=BD x 2"
From: Kon, Hon Lee
Sent: Friday, June 19, 1998 5:21 PM
Subject: [SI-LIST] : Bus bar
current carrying capability
I would be glad if someone could enlighten
me on determining the=20
current carrying capability of a bus bar.
Here is the scenario :
A 10KW(1000Amps @ 10V) power supply will
supply 5V(5KW) to another=20
DC-DC converter using a bus bar. The bus
bar dimension is 0.25" x=20
0.50" (depth x width) and is made of solid
copper with nickel plating.
The dc-dc converter will step down the
output voltage to 1V with=20
maximum output current of 84 Amps. The
power supply will supply=20
5V(5kW) to 12 dc-dc converter along the bus
Can someone advice me on the limitation of
this system ?
How can I determine the current carrying
capability of this bus bar=20
and how to overcome this limitation ?
Any reply will be greatly appreciated.=20
Thank you very much in advance.
Hardware Development Engineer
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