Ambient temperature refers to the temperature of the air or other medium surrounding the equipment or component. Under normal circumstances, the ambient temperature for equipment operation should be -20 to 40 ℃. In such cases, no additional ambient temperature marking is required. However, when the equipment is expected to be used in an environment outside this temperature range, it is considered a special situation. The marking should include the symbol Ta or Tamb along with the upper and lower limits of the ambient temperature. If this is not feasible, the symbol “X” should indicate the special operating conditions including the upper and lower limits of the ambient temperature. This means […]

In the operation of enterprises, warehouse management plays a very important role and is the cornerstone of ensuring the continuous stability of product quality. Once problems occur, it will directly cause economic losses and even bring adverse effects to the brand. Now let’s talk about those things in warehouse management that cannot be ignored. The warehouse should have appropriate warehouse management systems and be staffed with professional personnel. Stored items should be classified and placed on shelves. For small parts, storage boxes can be added to the shelves. Labels should be used to identify the model and quantity of each item for easy management and query. Regular inspections of stored

It is well known that the protective performance of the equipment enclosure protected by the dust-proof ignition-proof enclosure “t” is a key point that product design focuses on. Therefore, the structural rationality of the gaskets and seals that play a protective role is particularly important. I. Structural Requirements In the mating surfaces, compressed gaskets can be used to ensure the effectiveness of the enclosure seal. All gaskets and seals should be of an integral continuous structure, that is, annular and uninterrupted. The structure of the enclosure should ensure the correct position of the gaskets. If the protection degree of the enclosure depends on the gasket at the enclosure joint and

The encapsulated type involves completely enclosing the components that may generate sparks or heat capable of igniting explosive mixtures within a compound or a non-metallic casing with adhesive bonding, ensuring that they cannot ignite dust layers or explosive environments under operating or installation conditions. The above is the definition of potting type. In simple terms, it means to enclose the possible ignition sources so that they do not have the ability to ignite under normal operation and fault conditions. Common enclosure processes include die-casting and casting. For equipment protected by potting type “m”, the compound, potting structure, equipment temperature, testing and marking need to be considered. 1. Consider the manufacturer

Devices that produce sparks under normal operating conditions specifically refer to equipment that generates arcs and sparks under normal operating conditions. Their electrical clearances and creepage distances comply with industrial safety standards, ensuring reliable insulation distances. For instance, switches, relays, and contactors without explosion-proof protection measures. When such electrical equipment is applied in Zone 2 explosive hazardous environments, the “nR” restricted breathing enclosure explosion-proof technology can be considered for protection. Breathing-limited equipment with normal arc or spark devices should limit the dissipated power so that the temperature rise on the outside of the equipment enclosure does not exceed 20 K above the ambient temperature during normal operation. This is because

In explosive hazardous environments, the exposed non-charged metal parts of electrical equipment such as the metal enclosures, metal frameworks, equipment installed on grounded metal structures, metal piping and its fittings, cable protection conduits, and the metal sheaths of cables, etc., should all be grounded. Many standards have made clear regulations on the grounding requirements for electrical equipment in explosive hazardous environments. The grounding wire settings for electrical equipment should be treated differently according to different hazardous areas and types of electrical equipment. The metal enclosures of all electrical equipment in explosive environments, regardless of whether they are installed on grounded metal structures, should be grounded. The relevant requirements are as

The insulation dielectric strength of “n” type electrical equipment to ground or frame shall comply with the following provisions, except when the circuits installed in the electrical equipment are directly connected to the equipment frame or connected to the frame during equipment operation: a. Tests as specified in the relevant industrial standards for the various components of electrical equipment, or b. If the above test requirements do not exist, at least the test voltage shall be in accordance with the following 1) or 2) requirements, and shall not break down for at least 1 minute. 1) For electrical equipment with a peak supply voltage not exceeding 90 V or an