What qualifications do you need to install 35KV power equipment? Which company has more experience in installing 35KV power equipment?

The company has its own second-class qualification for electric power and decoration, first-class qualification for petrochemical industry, first-class qualification for pressure pipeline GA1/GB1/GB2/GC1first-class qualification for municipal general contracting, first-class qualification for electromechanical general contracting, first-class qualification for anti-corrosion and heat preservation, and first-class qualification for boiler installation and manufacturing.