How is busbar capacity calculated?
Which means, take a copper bus bar of 100 mm width and 10 mm thickness, the area of the copper bus bar is 10 * 100 sqmm. The total current carrying capacity of the busbar is 1.2 * area => 1000 sqmm* 1.2 =1200 Amps. Hence the total current carrying capacity of the copper 1200 Amps of 100mm width and 10 mm thickness.
How is earthing busbar calculated?
Let we calculate the required GI earth conductor size for 20kA Fault Current at 0.5 sec. Approximately 185Sqmm. Generally, GI is availed in the busbar structure hence Or You can take any combination of conductor size such as 50×3.5 Sqmm or 25x8Sqmm etc….Earthing conductor size calculation Formula:
| Material | Material Constant (k) |
|---|---|
| Copper | 205 |
| Aluminium | 126 |
How do you calculate the temperature rise of a busbar?
Temperature Rise Calculations has the correction factor as 0.88. The I2 is calculated from the dimension of main bus bar as 2 x 150 x 12 = 4275 x 0.88 x 0.91=3423.42 Amps. This current taken as I2. Maximum temperature rise obtained as 35.66oC over and above the ambient temperature of 45oC within the limit.
How is bus rating calculated?
Resolution: The Maximum mains rating, bus bar rating, load center cover number, lug torque data and short circuit current rating will be located on the Box Label of the load centers. The box label is approximately 2.5″ wide x 8.5″ long and is located on one of the inside, side walls of the enclosure.
How do you calculate voltage drop in busbar?
To calculate voltage drop:
- Multiply current in amperes by the length of the circuit in feet to get ampere-feet. Circuit length is the distance from the point of origin to the load end of the circuit.
- Divide by 100.
- Multiply by proper voltage drop value in tables. Result is voltage drop.
How do you calculate CPC size?
In order to find the correct CPC size using an adiabatic equation you would have to determine the fault current at the end of the 16a ctt. In order to do this you would have to select a cable, say in this case 2.5mm, and, by knowing the length of the run required, find out it’s R1 + R2 by looking up the ohms per meter.
What is the normal temperature of a busbar?
The ambient air tempera- ture of the busbars or busbar system should not exceed 40°C; an average of 35°C maxi- mum is recommended. For the continuous temperatures specified in the table, an emission level of 0.4 applies, equivalent to an oxidating copper bar.
What is temperature rise in busbar?
For energy-efficiency considerations, the design of the busbar system should be based on a 30°C rise above ambient, or less. Temperature rises above 65°C are not recommended and are not energy-efficient.
How do you calculate the current carrying capacity of aluminium busbar?
Hence the formula for calculating current carrying capacity,
- Copper: Copper busbar current carrying capacity = 1.2 * Busbar width in mm * Thickness in mm Amps.
- Aluminium: Aluminium busbar current carrying capacity = 0.8 * Busbar width in mm * Thickness in mm Amps.
- Iron Busbar.
- GI Bus bar.
- Silver Bus Bar.
- Example:
What is the voltage drop calculation formula?
Voltage drop of the circuit conductors can be determined by multiplying the current of the circuit by the total resistance of the circuit conductors: VD = I x R.
How do you calculate voltage drop in PDF?
The voltage drop would be: Voltage drop = ( 2 x 1.29 ohm / kft x 22A x 50 ft ) / 1,000 = 2.84 V. Percentage voltage drop = 2.84V / 120V = 0.0237 = 2.37%…How to Calculate Voltage Drop
- Z = Impedance of the conductor (ohms per 1,000 feet, or ohms / kft)
- I = Load current (amperes)
- L = Length (feet)
How is earthing size calculated?
Required Earthing Conductor size = Cross sectional area x Total allowance x Safety factor. Required Earthing Conductor size = 1125 Sq.mm say 1200 Sq.mm. Hence, Considered 1Nox12x100 mm GI Strip or 2Nox6 x 100 mm GI Strips.
How hot do busbars get?
85°C.
Operating Temperature of Bus bar (θ)=85°C.