CT Cabinet are usually produced in conformance with NEMA and UL regulations, therefore, require the manufacturing companies to ensure their Metal Fabrication processes are aligned with the expected standards and specifications by the quality control bodies.
Electrical Enclosure Comparisons of NEMA and UL Type Rating Standards
When it comes to electrical safety in the USA there are two main organizations who set safety standards: NEMA (the National Electrical Manufacturers Association) and UL (Underwriters Laboratories).