The thermal dissipation of an electrical enclosure is one of the most important elements to consider before installing the cabinet itself. Therefore, it is necessary to calculate the thermal balance of the electrical cabinet to preserve the correct functioning of the equipment.The thermal balance of an electrical cabinet is valid if the total sum of the thermal powers acting upon it is zero. To obtain this, the design conditions – such as the desired temperature inside the cabinet and the surroundings – must be defined. During the design of heating systems, the lowest verifiable temperature in the immediate environment must be considered; on the contrary, for the cooling system, the highest possible temperature must be considered. A good rule of thumb is to set 35°C for the ideal internal temperature. This may seem high, but it is sufficient to avoid overheating the electrical components whilst ensuring the risk of condensation, which could cause a short circuit, is very low.
Read the full article in the November issue of PBSI
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