Design of power supply and lighting for shielded rooms

1. The power supply system of the electromagnetic shielding room should be able to shield the power consumption of the equipment in the room and the usage of the equipment under test, and should have reserved capacity and the possibility of expansion and upgrade.
2. The power supply and lighting design scheme of the electromagnetic shielded room should comply with the requirements of my country's current standards and regulations. When there are high-power power-consuming machines and equipment in the electromagnetic shielding room, it is appropriate to supply power to an independent control loop.
3. Set the power switch of the electromagnetic shielding room at appropriate locations inside and outside the electromagnetic shielding room. Its outdoor main gate cannot be equipped with residual current protection equipment.
4. For power supply routes in electromagnetic shielding rooms, please set power filters on both sides of the shield. The working voltage, current, frequency, etc. of the filter should be determined based on the working voltage of the line, the measured current, and the frequency of the line. Among them, the rated voltage of the power filter must not be less than 1.2 times the measured current.
5. For electromagnetic shielded rooms that require three-phase four-wire power supply, power filters should be placed on the live wire, neutral line, and neutral point. The PE wires are not suitable for introduction into the electromagnetic shielded room. When PE wires must be introduced, only one PE wire should be introduced into each electromagnetic shielding room, and its cross-section should not be lower than the maximum cross-section value of the PE wire in the original route.
6. The damage index value of the power filter should be consistent with the shielding efficiency of the shielded room.
7. The lighting in electromagnetic shielding rooms should comply with the relevant requirements of the current national industry standard "Architectural Lighting Design Standard" GB50034. In the selection of light source models, new light sources are highly selective and have little harm to the power grid. The lighting fixtures used to detect the characteristics of the shielded room should choose a lighting source with a small impact of electromagnetic radiation.
8. Copper core transmission lines should be used for power distribution equipment and lighting routes in the magnetic induction shielded machine room.