How to Calculate Short Circuit Current Rating in Electrical LT Panels

What is Short Circuit Current Rating in Electrical Panels?

Short Circuit Current Rating is the maximum short circuit current on the Switchgear or assembly can safely withstand when protected by the specific over-current protective device for specified time.?

There are two options to approach calculating the available fault current at the Electrical Panels. We can calculate the maximum amount that the Power Panel will let through, as if the power generation facility was hooked directly to the line side of the panel, or we can calculate the available fault current considering the provided available fault current from the Load. The former approach which results in the maximum amount of fault current that a Electrical LT Panel will let through is referred to as an infinite busbar calculation.

Short-circuit protection and short-circuit withstand strength

Assemblies shall be capable of withstanding the thermal and dynamic stresses rated short circuit currents not exceeding the rated values.

• Required Basic Details for Calculate short circuit withstand Strength

1. Rating of Current
2. Nominal voltage
3. Min. continuous operating voltage
4. Frequency
5. Ambient Temp.
6. Type of panel Installation (Indoor/Outdoor)
7. Panel Busbar Enclosure Size

Minimum Size of Busbar For Short Circuit Conditions

Standard states that both the main and horizontal or vertical busbars distribution shall withstand two short circuit currents for 1-3 Second, respectively, or?50kA for 3Sec (50 kA / 3 s) and 85kA for 1Sec (85kA/ 1 s)

Also Some points to be Consider for Busbar short circuit Calculation as below

• Derating factor due to Ambient Temp.
• Derating factor due to grade of Aluminium /Copper Busbar
• Skin effect on Busbar
• Proximity effect On Busbar
• Space factor for Rectangular Busbar
• Shear Strength of Insulator

Accu-Panels Energy is India's Largest Electrical Control Panel Manufacturer with Latest Technology Machinery. Accu-panels Always ready to help Electrical Contractor, Electrical Consultant, End user and OEM for Busbar Calculation, Single line Drawing Preparation, General Arrangement Design for Electrical Panels.

Accu Panels Energy Short Circuit Analysis complies with IEC 61439 standard, IEC 61439?defines which particular the manufacturer and the user of a switchgear and control gear assembly have to define.

We always take special care and safety while manufacturing panels in our factory. Now is the time to remove the old belief of our electric panel. Thinking of buying a new Electrical HT/LT Panel from Accu Panels.

Finally, Electrical Panels are used for dairy industries, plastics industries, HVAC, chemical plants, marine industries, food and beverage industries, mining and ball mill applications, renewable energy sources and solar power plants. The electrical panel is usually located in the basement or utility room with the necessary safety equipment.