A 4-square photovoltaic line can usually carry 600 volts, because the insulating material it uses can provide enough electrical insulation to prevent current leakage and short circuit. These insulating materials are designed and tested to ensure that they provide the necessary insulating ability at rated voltage.
Manufacturers of photovoltaic lines will determine the appropriate rated voltage for their products according to standards and specifications to ensure their safe operation. Although generally speaking, a 4-square photovoltaic line can carry 600 volts, it is recommended to check the technical specifications and product manuals of photovoltaic lines to confirm whether this particular type of photovoltaic line has the ability to adapt to 600 volts. In addition, relevant electrical installation specifications and suggestions should be followed to ensure the safe use of photovoltaic lines, and professional power engineers should be consulted if necessary.