There are two temperature categories for copper buss bar. For a 30 degree C rise the sizes are 1/4" X 1" or 3/8" X 3/4". For a 50 degree C rise the size is 1/4" X 3/4". Both of these temperature categories will handle 400 amps.
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To obtain the amp of the copper bus bar, multiply the width of the bus bar by the thickness of the bus bar to obtain the current carrying capacity of the bus bar.
A 40 amp breaker is used in conjunction with AWG # 8 copper wire. The black and red wires are connected to the breaker. The ground wire is connected to the ground bar and the white wire is connected to the neutral bar.
The following sizes of bus-bar will have the capacity to handle 1000 amps, 3/16 x 4", 1/4 x 3 1/2", 3/8 x 2 1/2", and 1/2 x 2".
Washing machines in the U.S. operate on 120 volts. That requires a single pole 20 amp breaker and wired with 12/2 w-ground wire. Black to the breaker, white to the neutral bus bar, and copper ground to the ground bus bar.
Yes, as long as the bar fridge wattage is less than 650 W