Electric heating and electrical four categories of electric heating equipment
Continuing from the physics textbook we discussed last time about "Electric Heating and Electrical Three", the "Electric Heating and Electrical Four" you mentioned most likely refers to the closely related national standard — GB 5959.4 "Safety of electroheat installations - Part 4: Particular requirements for resistance heating installations".
If "Electric Heating and Electrical Three" is the theoretical foundation, then "Electric Heating and Electrical Four" is the safety guideline that transforms theory into industrial practice. The following is the core information about this standard:
