Environmental and climate conditions can negatively affect electrical enclosures in several ways. Beside the negative effects of excessive heat, dust and dirt, and the formation of corrosion is an issue that can plague enclosures. Corrosion doesn’t form without a reason; excessive condensation is most often the primary contributor to the formation of corrosion within enclosures.
For the electrical components within the enclosure, the formation of corrosion can reduce electrical continuity and the lifespan of the electrical connections leading to short circuits and breakdowns. Continue reading
Many of the requirements found in the National Electric Code (NFPA 70) specify that electrical equipment to be installed in non-hazardous industrial facilities, such as wastewater treatment plants, food processing plants, and data centers, must be listed or labeled by UL or another standards testing agency. Continue reading
Many enclosure air conditioners are designed similarly to residential cooling systems. They use a compressor to pump refrigerant through a condenser and an evaporator and remove heat from the enclosed air.
The evaporator coil is located in the enclosure air path, where the refrigerant exists in the form of a vapor that removes heat from the environment. The refrigerant is then compressed and pumped to a condenser located outside the enclosure where it returns to liquid form and releases all the heat it absorbed from inside the enclosure. The refrigerant then changs from a liquid into a vapor as it passes into the evaporator through a small orifice. This process is continuously repeated to maintain a consistently cool temperature within the enclosure. Continue reading
Cooling an electrical enclosure involves processes for transferring heat from inside the enclosure and discharging it to the surrounding air. Various heat transfer mechanisms exist, including convection, conduction, thermal radiation, and evaporative cooling.
When selecting an industrial control panel, it’s essential to give careful consideration to the environment where the panel will be installed. The ambient temperature, humidity, risk of exposure to water, snow or ice, and the presence of chemicals all have an impact the on specification of the enclosure and how it is cooled.
Before finalizing the specification for the enclosure, it’s crucial that these environmental variables are assessed and their impact evaluated. Although there are a number of aspects to consider, they can be conveniently grouped into six categories. Continue reading
Valuable electronic equipment housed inside an electrical cabinet is typically protected from water, dirt, and dust. However, this is not enough to defend it from two other important potentially harmful threats: moisture and overheating. Heat and moisture are the two biggest enemies of electrical equipment, potentially leading to malfunction, failure, and a shorter equipment life.
Modern power equipment, while robust, has an Achilles heel because it is sensitive to heat and will malfunction and fail if heat rises above recommended operating levels. This necessitates careful enclosure design and the provision of robust enclosure cooling solutions. Here are 8 steps you can take to select the right enclosure cooling supplier.
The design and assembly of an electrical enclosure is complicated by the need to comply with various requirements, such as those laid out in the National Electrical Code (NEC), and designers naturally focus on complying with those requirements. Strangely, the NEC makes only one passing reference to the cooling of an electrical enclosure. Perhaps it’s because of this that designers and panel assemblers so frequently underestimate the cooling requirements. Here are six common cooling mistakes that are made when assembling electrical enclosures. Continue reading
Enclosure cooling fans are one type of cooling device used to help keep heat producing electrical components from overheating. Fans are unique in that they are considered to be an open loop cooling system whereas air to air heat exchangers and enclosure air conditioners are closed loop systems.
The use of electrical enclosure cooling systems has grown exponentially in the last few decades. Reasons for this growth include higher cabinet heat loads and the use of more sophisticated electrical drives and equipment. Concurrently, there has been a desire to reduce costs and this has led to the placement of electrical enclosures closer to the plant and equipment, thus exposing these enclosures to harsher environments.