Switchgear Room Temperature

Limit values for humidity and air quality e g.

Switchgear room temperature.

As a general guidance rule the temperature within the low voltage switchgear should not exceed 50 55ºc. What affects the operating temperature within lv switchgear photo credit. I suppose the other point for consideration is why are we running the switchgear at 70 let alone 90 and what assessment is the designer making for the limiting capacity of this temperature on the protective devive most of the current ratings are actually declared for 50c from memory so you should derate say a 100a deviceto perhaps 90 ish amps if its operating at 70c and perhaps even. It results in condensation of moisture on the switchgear surfaces when there is a sudden change in temperature because of outside weather or inside air conditioning factors.

If switchroom or plant room ambients are typically considered to be up to 25 c this relates to a 25 30k rise above ambient. Design criteria for room ventilation. As an illustration the diagram below shows simple room layout consisting of a 22 kv switchboard some dc and scada panels click for a larger image. In order to design a good ventilation of switchgear and transformer rooms the air in the room must meet various requirements.

Each switchroom is unique and needs to be considered in relation to the specific equipment which will be installed. Dust content may also be set. Switchgear heat emissions and temperature rise is something of a snake and mongoose affair between switchgear manufacturers and designers clients a small dx split aircon unit often serves to eliminate any unseemly arguments after the fact regards oms let the wind blow you across a big floor.