The selection of RCD should be determined according to the installation site, power supply mode of different line systems, load type, leakage current of the controlled circuit and grounding condition of electrical equipment. I. RCD use regulations (I) Places and equipment where RCD must be installed 1. Mobile electrical equipment and handheld power tools (except Class III) 2. Electrical equipment used in damp, highly corrosive and other harsh environments such as boiler rooms, canteens, basements, bathrooms; 3. Electrical machinery and equipment at construction sites; 4. Equipment for temporary power supply; 5. Socket circuits in guest rooms of hotels, restaurants, guest houses, etc.; 6. Socket circuits in government agencies, schools, enterprises, office buildings and buildings; 7. Special lines for incoming switches or sockets in each household of residential buildings; 8. Power supply lines, lighting equipment and other electrical equipment installed in water (such as swimming pools, baths, fountains, etc.); 9. Medical electrical equipment in direct contact with the human body (excluding emergency and surgical electrical equipment); 10. Electrical equipment powered by TT system and other places where RCD needs to be installed.
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