IPFLD125 ABB  Circuit Board

This means that not only must it be built in accordance with modern criteria as to watertightness but that, prior to construction, the groundwater level must be checked during various periods of the year, as well as the behaviour of the soil and surrounding land when subjected to heavy rainfall. By and large, a correct assessment of the environmental conditions must be based on a set of historical data recorded daily, monthly or on a seasonal basis as (appropriate). 

Surveys prior to installation dedicated to a specific situation may not be sufficiently comprehensive to determine whether the environment-product are compatible. Following these analyses, the substation may have to be installed on a raised deck. If it is installed at ground level, drainage ducts for the rain will have to be installed to prevent this water from penetrating inside the substation. Particular care must be paid to the entrance doorways to ensure that water is unable to drip onto the door or collect in front of it.  

Cable entries must be sealed to prevent water, polluted air or vermin from entering. The cable trenches must be covered to prevent moisture and polluted air from penetrating inside the substation. If water could accumulate in the cable trenches, it is advisable to install a water trap with an extractor pump activated by the water level. Particular care must be taken if the substation floor is the raised type, with ample space for power and auxiliary cables where outdoor air can enter. Condensation could easily form in the lower parts of the MV switchgear unless the floor is properly sealed.

The actual structure of the substation (if in disrepair) and its entrance doors are the points where dust, corrosive and/ or inflammable fumes or gas, vapours or salt can enter. The first step to take is to ensure that the outer cladding is proof against such pollutants. The doors must be equipped with closing mechanisms that prevent them from remaining open after the personnel have entered. A further barrier could be to build an antechamber immediately after the entrance door to the substation.

The structure and details of the product：

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