Laboratory electrical system layout requirements? - Frequently Asked Questions
electrical system layout requirements?
loads can be powered by dedicated transformers, or by dedicated low-voltage distribution lines laid by shared transformers, shock loads, fluctuating loads, nonlinear loads, large-capacity single-phase loads, and frequently started equipment, etc. , should be used at the low-voltage bus of the transformer...
Text label: pharma machinery installation layout, electrical system layout requirements
electrical system layout requirements?
loads can be powered by dedicated transformers, or by dedicated low-voltage distribution lines laid by shared transformers, shock loads, fluctuating loads, nonlinear loads, large-capacity single-phase loads, and frequently started equipment, etc. , it should be powered by a separate feeder loop at the low-voltage busbar of the transformer or by a separate transformer; when the seasonal operation of air conditioning, heating and other loads account for a large proportion, the determination of the capacity and number of transformers should consider the economical operation of the transformer; general laboratory The electrical equipment can be powered by the fixed power socket fixed on the test bench or close to the test bench. The circuit of the power socket should be equipped with leakage protection appliances, and independent protection switches should be set on the power supply side of each laboratory; copper core wires should be used for power supply and distribution lines. For cables, it is ideal to lay the cables through pipes. Dark laying can not only protect the wires, but also keep the room clean and not easy to accumulate dust; for high-rise or multi-layer scientific experimental buildings with many lines, the vertical lines should be laid in pipe wells. Pipeline wells should be set up separately for weak current pipelines. When laid in the same pipeline well, they should be laid on both sides of the pipeline well.
There are rooms for various purposes in the laboratory building, and the requirements for contrast are also different. For rooms where fine work is performed, it is required to have higher illuminance than rooms for rough work, and more lamps and lanterns must be installed with high illuminance requirements. Or increase the capacity of the light source; general laboratories should use open or direct light distribution lamps with grids, the efficiency of open lamps should not be lower than 0.7, the efficiency of lamps with grids should not be lower than 0.6, laboratory lamps grids, reflections It is not advisable to use full mirror reflection materials; fluorescent lamps should be used in general laboratories, high-intensity gas discharge lamps should be used in laboratories with a floor height greater than 6m, and high color rendering light sources should be used for color identification; , gas discharge lamps should not be used; in humid, corrosive gas and steam places, lamps with corresponding protective properties should be selected; dark rooms, electron microscope rooms, etc. should be equipped with monochrome lighting, and working status signs should be installed at the entrance; biological culture room Ultraviolet sterilization lamps should be installed, and their control switches should be located outside the door and separated from the control switches of general lighting fixtures; lighting should be installed in the technical layer of the pipeline and powered by a separate branch or special distribution box; the lighting load should be provided by a separate Transformers, separate power distribution devices or separate circuits for power supply should be provided with separate switches to protect electrical appliances, lighting distribution boxes should be arranged in layers or zones, and light control switches should be arranged in sections and zones for large-area lighting places. Zhongjing Global Purification can provide consulting, planning, design, construction, installation, transformation and other supporting services for laboratories and sterile rooms.
The grounding resistance value of laboratory working grounding should be determined according to the specific requirements of experimental instruments and equipment, and should not be greater than 4Ω without special requirements. The grounding resistance value of power supply working grounding and protective grounding should not be greater than 4Ω; various grounding A set of grounding devices should be shared. If there are no special requirements, the grounding resistance value should not be greater than 1Ω; the working grounding of the laboratory and the grounding device should be connected at a single point. Connected to the grounding device, the grounding trunk introduced into the room from the grounding device should be laid with insulated conductors through steel pipes; the protective grounding should adopt equipotential bonding measures.
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