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copper flat bar

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• 09-06-2024 11:32pm
Registered Users Posts: 428 ✭✭

how many amps can a 22mm x 3mm flat copper bar carry. I have a small solar system and was thinking would this bar be suitable as a busbar? Thanks

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#2
Registered Users Posts: 5,372 ✭✭✭

66mm squared, look up the current carrying capacity of a 66sq coper cable, should be the same, but it will depending on mounting, environment etc

At a guess it will easily carry a couple or hundred amps. Look at the size of the bus bar in a regular consumer unit, these are normally ratted for 80/100A

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#3
Registered Users Posts: 4,333 ✭✭✭

I=K*W*D*F/ (L*T)

Where:

• I = Current (in amperes)
• K = Constant (1.2 for copper, 0.8 for aluminum)
• W = Width of the busbar (in inches)
• D = Depth of the busbar (in inches)
• F = Frequency (in Hertz)
• L = Length of the busbar (in inches)
• T = Temperature correction factor (typically 1.0 unless specified)

If you look up Busbar tables they say it would be good for 260A in free air

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#4
Registered Users Posts: 428 ✭✭

It will be in free air. The maximum draw I would have is between 2100 and 2300w for about 20 minutes. So it should just be ok? Or should I double up the bars?

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#5
Registered Users Posts: 4,333 ✭✭✭

At what Voltage? 230 or 400?

Amps = Watts / Volts

So its 6a at 400v or 10a at 230v

on either of them you are ok…

If you think of it, a 1.5mm2 cable is protected by a 6a breaker for lights…

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#6
Registered Users Posts: 428 ✭✭

Im referring to the DC side of it and its 12v