Low Tension (LT) panels are the backbone of electrical power distribution in industrial and commercial projects. Selecting the right panel specification is critical to safety, reliability, and long-term operating costs.
What is an LT Panel?
An LT panel is a metallic enclosure housing circuit breakers, bus bars, measuring instruments, and protective devices. It receives power from the HT/LT transformer secondary and distributes it to various loads within a facility.
Key Selection Parameters
1. Current Rating
The incoming current rating is determined by the connected load plus a diversity factor and future expansion allowance. Standard ratings range from 400A to 3200A for main panels.
2. Short Circuit Withstand Capacity
The panel must be rated to withstand the prospective short circuit current at the point of installation — typically 25kA, 35kA, or 50kA for one second.
3. Protection Degree (IP Rating)
Choose the IP rating based on the installation environment. IP41 is standard for clean indoor locations; IP54 or IP55 is recommended for dusty or damp environments.
IEC 61439 Type-Tested Assemblies
IEC 61439-2 distinguishes between Type-Tested Assemblies (TTA) and Partially Type-Tested Assemblies (PTTA). For critical infrastructure, always specify a TTA from a certified manufacturer with CPRI test certificates.
Paramount Electricals manufactures IEC 61439-2 compliant LT panels that undergo rigorous type testing at CPRI (Central Power Research Institute), ensuring our panels meet the highest safety and performance standards.
Conclusion
Correct LT panel specification ensures safety, energy efficiency, and long service life. Always work with a certified manufacturer and obtain complete type test certificates before procurement.
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