Switchgear Room Temperature

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.

Switchgear room temperature. The high humidity level in a switchgear room causes several damaging effects. As a general guidance rule the temperature within the low voltage switchgear should not exceed 50 55ºc. Each switchroom is unique and needs to be considered in relation to the specific equipment which will be installed. 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.

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. 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. What affects the operating temperature within lv switchgear photo credit. The most important is not to exceed the permissible maximum temperature.

Limit values for humidity and air quality e g. In order to design a good ventilation of switchgear and transformer rooms the air in the room must meet various requirements. If switchroom or plant room ambients are typically considered to be up to 25 c this relates to a 25 30k rise above ambient.