In multiple fields such as industrial automation, power operation and maintenance, and new energy, the metal enclosure of electrical control cabinets is the core carrier to ensure the safe operation of electrical components. The rationality of its customization directly determines the protection effect and service life. With the increasing requirements of the industry for equipment adaptability, standardized enclosures can no longer meet the needs of complex scenarios, and customization has become the mainstream. This article briefly analyzes its application scenarios, material selection, size specifications, and core customization notes for indoor and outdoor use, helping enterprises select models accurately and avoid misunderstandings.

The core function of the metal enclosure is to protect internal components such as PLC controllers and frequency converters, isolating dust, moisture and other interferences. Its application scenarios are highly bound to protection requirements, mainly divided into 4 categories:

As the core application scenario, it covers factory production lines, mining machinery, chemical equipment, etc. The scenario is characterized by high dust, strong vibration, and corrosive media in some chemical scenarios. The enclosure needs to have strong mechanical strength and basic protection performance, adapt to the layout of internal components, and ensure the stable operation of equipment.

Applied to outdoor distribution boxes, communication base stations, charging piles, traffic signal control, etc., it needs to face wind, sun, rain and snow erosion. The core requirements are waterproof, dustproof, anti-corrosion and anti-ultraviolet. Some coastal scenarios need additional protection against salt spray corrosion.

Including office buildings, computer rooms, hospitals, residential buildings, etc., the environment is mild. The core requirements are dustproof, anti-misoperation, and aesthetic adaptation, taking into account the convenience of wiring and operation and maintenance. Special indoor scenarios such as hospitals need to pay attention to cleanliness and anti-electromagnetic interference.

The food processing industry requires easy cleaning and no卫生 dead corners; the medical industry requires anti-electromagnetic interference; the national defense and financial fields require higher mechanical strength and confidentiality to adapt to personalized protection needs.

Materials determine the protection, service life and cost of the enclosure. Conventional customization is mainly metal. Different materials have obvious differences in characteristics and adaptable scenarios, as follows:

Cost-effective, with a thickness of 1.0-2.0mm, moderate strength and easy processing. After surface treatment, it has basic rust and dust prevention performance and can be customized in color. It is suitable for indoor computer rooms, ordinary workshops, etc. It is the first choice for enterprises with limited budget and low protection requirements, and is not suitable for outdoor and corrosive environments.

With a thickness of 1.2-2.5mm, it has excellent anti-corrosion and anti-rust performance. 304 stainless steel is suitable for outdoor humid and coastal mild salt spray scenarios; 316 stainless steel has stronger corrosion resistance, suitable for chemical industry, heavy salt spray environments, with surface wire drawing treatment and long service life, but higher cost and slightly greater processing difficulty.

With a thickness of 1.5-2.0mm, it is lightweight (density is 1/3 of steel), has good thermal conductivity and beautiful appearance. After anodizing, it can be adapted to high-end outdoor scenarios, assisting in heat dissipation of internal components. It is suitable for equipment with limited installation space or frequent movement. Its mechanical strength is lower than that of steel, so it is not suitable for heavy load and strong impact scenarios.

Electrolytic plates balance strength and rust prevention, used for brand-specific control cabinets; high-strength thermoplastic materials have no rust risk, adapting to special needs of weight and corrosion resistance; FRP (Fiberglass Reinforced Plastics) has excellent insulation and corrosion resistance, suitable for extreme corrosive scenarios (such as chemical industry, wastewater treatment).

There is no uniform standard for size, which mainly depends on the layout of internal components, the space of installation scenarios and transportation needs. Conventional standardized sizes are presented in the form of a table, and customized sizes can be flexibly adjusted:

Standardized sizes are suitable for conventional electrical components, facilitating mass production and installation. The specific specifications are as follows (unit: mm, height × width × depth):

Customization needs to consider three points: ① Reserve 10-20% redundant space to adapt to component layout, wiring and operation and maintenance; ② Fit the installation scenario, take windproof and fixation into account for outdoor use, and adapt to space layout for indoor use; ③ Comply with transportation restrictions to reduce transportation costs. Conventional customization range: height 300-2200mm, width 400-1800mm, depth 200-1000mm, supporting various installation methods.

There are great differences between indoor and outdoor environments. Customization needs to be designed pertinently to avoid protection failure. The core notes are as follows:

The core is adaptability, convenience and basic protection. Pay attention to the following 4 points:

1. Protection Level: Choose IP54 for conventional scenarios, upgrade to IP55 for dusty scenarios, and pay attention to surface cleanliness and no dead corners for special scenarios.
2. Size Adaptation: Consider wall bearing capacity for wall-mounted type, reserve operation and maintenance space for floor-standing type, reasonably plan internal layout, and separate strong and weak electricity.
3. Material Selection: Prioritize cold-rolled steel plates; choose 304 stainless steel or enhanced anti-corrosion treatment for humid indoor environments; choose aluminum alloy for high-end scenarios.
4. Detail Design: Reserve wiring holes and heat dissipation holes, equip with waterproof plugs and locked cabinet doors, and can customize mounting plates, wire troughs and surface colors.

The core is waterproof, dustproof, anti-corrosion, anti-impact and anti-ultraviolet. Pay attention to the following 5 points:

1. Protection Level: Minimum IP55, upgrade to IP65+ for rainy and dusty areas, IP66+ for corrosive scenarios, pay attention to sealing details and top cover waterproof design.
2. Material Selection: Prioritize 304/316 stainless steel (choose 316 for coastal heavy corrosion), and choose cold-rolled steel plates with heavy anti-corrosion treatment if the budget is limited.
3. Installation and Fixation: Equip floor-standing type with a base not less than 200mm, choose firm brackets for wall-mounted type, reserve operation and maintenance space, and avoid unstable center of gravity.
4. Heat Dissipation and Anti-Condensation: Set heat dissipation holes and fans (bottom in and top out), install anti-condensation equipment and desiccants, and equip cabinet air conditioners for equipment with large heat generation.
5. Detail Protection: Adopt anti-ultraviolet coating, round corner treatment for edges and corners, equip with heavy-duty locks, and can customize sunshades to reduce internal temperature of the cabinet.