Per Phase Bus Strip De rating Factor
K1 1 No of Bus Bar per Phase 1
Bus bar Insulating Material De K2 1.2 PVC Sleeving
Bus bar Position De rating
Factor K3 1 Edge-mounted bars
Bus bar Installation Media De
rating Factor K4 1 Calm indoor atmosphere
Bus bar Artificial Ventilation with artificial ventilation
De rating Factor K5 1
Enclosure & Ventilation De
rating Factor K6 0.95 Indoors ( Panel is well Ventilated)
Proxy Effect De rating Factor K7 0.82 min factor
Altitude of Bus Bar
installation De rating Factor K8 1 Altitude > 1000m
Total De rating Factor 0.9348
Desire Current Rating of Bus
bar based on Current Density 400
1.2 Sq.MM
Current Rating of Bus bar
after De rating Factor 373.92
Bus bar Cross Section Area as per Short Circuit= Isc X√ ((K/( θtx100)x(1+ α20xθ) xt
Faultlevel A 50000
Material Constant 1.166
Temp Rise of Busbnar Theta1 135 DegC
Constant 100
Constant 1
Alfa20 (Temp Coeff at 20DegC) 0.00403
Operating Temp of Busbar 50 DegC
Duration (Sec.) 1 Seconds
Bus bar Cross Section Area as per 509.347621963625 Sq.mm
Short Circuit 10.18695 50
As per the busbar 40 X 8 the 602 Amps
Current is
Bus bar Current Details:
Rated Voltage 415V
Desire Maximum Current Rating 400
of Bus bar (I2)
Fault Current (Isc) 50KA
Fault Duration (t) 1 Sec
Bus bar Temperature details:
Operating Temperature of Bus 50°C
bar (θ)
Final Temperature of Bus bar 185°C
during Fault(θ1)=.
Temperature rise of Bus Bar Bar 135°C
during Fault (θt=θ1-θ)
Ambient Temperature (θn) 50°C
Maximum Bus Bar Temperature 85°C
Rise
Altitude of Panel Installation on 1000 Meter
Site
Bus bar Details:
Bus bar Material Copper
Current Density of Bus Bar 1.2 Sq,MM
Material
Temperature Co efficient of 0.00403
Material Resistance at 20°c(α20)
Material Constant(K) 1.166
Bus bar Size Calculation
Current Rating of Bus bar after De rating Factor (I1)= 373.92
I2 X De rating Factor
Bus bar Cross Section Area as per Short Circuit 509.35
Final Calculated Bus Bar Cross Section Area 510
Actual Selected Bus bar size is 50 X 10
Panel 1008000000 2560000 0.254%
40 30 40 30 40 30 40 250
