The safety requirements for enclosure openings of Class 1 equipment are electrical clearance and creepage distance. For the power supply part of Class 1 equipment, the electrical clearance shall not be less than 4mm and the creepage distance shall not be less than 6mm. If openings reduce the degree of protection of the equipment enclosure, the equipment shall be designed to protect parts of the human body from contact with live parts. If there are more than two openings, the distance between them should be greater than 50mm.