Electric Cabinet

 

Electric cabinet fabrication starts with the equipment envelope, mounting requirements, and operating environment. The material and sheet thickness must provide the required structural stiffness while allowing the cabinet to be formed, welded, coated and assembled without unacceptable distortion.

 

Cold-rolled steel is commonly used for indoor electrical cabinets and control enclosures where the specified coating system provides the required surface protection. Galvanized steel may be considered where the substrate requires additional corrosion protection. Stainless steel can be specified for applications requiring greater resistance to particular moisture or chemical exposure conditions. Final selection depends on the environment, structural requirements, coating compatibility, and project cost constraints.

 

Laser cutting is used to produce panel outlines, ventilation openings, cable entries and mounting features. CNC bending forms the cabinet panels, doors, brackets and reinforcing sections. Bend allowance, material thickness, tooling radius and springback must be considered together to maintain the finished dimensions.

 

Welded frames require control of heat input, joint preparation and welding sequence. Poorly controlled welding can cause door misalignment, panel distortion and inconsistent gasket compression. Where the cabinet uses removable panels or modular assemblies, the manufacturing drawing should also define fastening locations, access clearances, and the interfaces between adjacent sections.

 

Electric Cabinet Material and Manufacturing Specifications

 

Parameter	Engineering considerations	Inspection or verification
Cabinet material	Cold-rolled steel, galvanized steel, or stainless steel as specified	Material certificate and grade verification
Sheet thickness	Selected according to cabinet size, loading, and panel stiffness	Thickness measurement
Panel dimensions	Drawing-defined dimensions and tolerances	Calibrated gauges or optical measurement
Mounting features	Hole positions, threaded inserts and equipment interfaces	Dimensional inspection and assembly trial
Bending geometry	Bend radius, angle, springback and flange length	Angle gauge and dimensional inspection
Welded structure	Joint geometry, weld continuity and distortion limits	Visual inspection and specified weld tests
Surface protection	Coating system selected for indoor or outdoor exposure	Coating thickness and adhesion tests as specified
Enclosure protection	IP rating defined by the finished enclosure design	Testing to the applicable IEC 60529 requirements

 

The values above define the engineering control items. Actual material grades, thicknesses, tolerances, and test acceptance limits should be confirmed in the approved drawing and project specification.

Design for Manufacturability (DFM)
Before releasing a new electric cabinet to production, the following items should be reviewed:

Panel geometry: Confirm that flange lengths, bend radii, and corner clearances are compatible with the forming process.
Mounting interfaces: Verify that rail positions, fixing holes, hinges, and locks match the equipment installation drawing.
Weld access: Check whether the specified joints can be welded and inspected without obstructing adjacent features.
Cable entry: Define gland plate locations, opening sizes and clearance for the intended cable routing.
Service access: Confirm that doors, removable panels and fasteners allow installation and maintenance.
Packaging and transport: Assess panel deformation risk, surface scratching and protection of protruding fittings.

For projects requiring an industrial control enclosure, see our Industrial Electrical Cabinet product range.

 

 

The enclosure joining method affects structural stiffness, dimensional stability, appearance and environmental protection. Depending on the cabinet design, manufacturing may use resistance welding, MIG welding, TIG welding, spot welding, or mechanical fastening. The process is selected according to sheet thickness, material type, joint accessibility, and the required load-bearing performance.

 

Welded frames should be evaluated for joint continuity, distortion, and the condition of the surrounding sheet metal. For doors and panels requiring accurate alignment, the welding sequence and fixture design should control movement before final machining or assembly.

 

Where the cabinet contains electrical equipment, the design should also identify protective-earth bonding points and the requirements for electrical continuity verification.

Surface Protection and Outdoor Enclosure Design
Powder coating can provide a durable surface finish when the pretreatment, coating formulation, curing conditions, and substrate preparation are properly controlled. Galvanized or stainless steel may be selected for specific exposure conditions, but neither material choice nor coating appearance alone establishes the finished cabinet's corrosion resistance.

 

For outdoor electric cabinets, the design should address:
Door gaskets and their compression at the closed position.
Cable glands, connectors and other penetrations through the enclosure.
Drainage and condensation management.
Ventilation openings and any associated protective components.
Coating thickness, adhesion and resistance to the specified environment.
Corrosion protection around cut edges, welded joints and fastener interfaces.

IP65 and IP66 are enclosure protection classifications, not generic properties of a sheet metal cabinet. The complete assembled enclosure must meet the relevant ingress protection test requirements in its final configuration, including the applicable doors, seals, cable entries, and ventilation accessories.

 

Process Selection by Cabinet Type

 

Cabinet type	Main fabrication considerations	Project verification
Industrial control cabinet	Mounting plates, component access and cable routing	Dimensional and assembly inspection
PLC control cabinet	DIN rail mounting, cable separation, and service access	Layout and interface verification
Outdoor electric cabinet	Door seals, cable entries and surface corrosion protection	Specified IP and environmental tests
Power distribution cabinet	Structural support, equipment clearance and grounding interfaces	Assembly and electrical safety checks
Server cabinet	Equipment mounting, cable management and airflow openings	Dimensional and load testing as specified
Energy storage cabinet	Structural layout, thermal management and safety-system interfaces	Project-specific structural and environmental validation

 

For server and data equipment applications, review the Server Cabinet and Server Enclosure range.

 

Request Custom Technical Evaluation

 

 

Quality control for an electric cabinet should cover the full manufacturing sequence, from incoming sheet material to the finished enclosure. Inspection criteria should be linked to the approved drawing, bill of materials, surface treatment specification, and required electrical or environmental tests.

 

Incoming inspection can verify material grade, sheet thickness, and surface condition. During fabrication, checks should focus on panel dimensions, bend angles, mounting-hole positions, weld condition, and frame squareness. After finishing, the inspection plan should address coating appearance, specified coating thickness, door alignment, fastener fit, and any damage around formed or welded edges.

 

For cabinets designed for outdoor service, IP testing should be performed on the relevant assembled configuration against the specified ingress protection rating. Coating adhesion and corrosion tests should follow the agreed test method and exposure duration. Where required, electrical checks may include protective-earth continuity, insulation resistance, and dielectric withstand testing under the applicable product requirements.

 

Apollo's manufacturing quality documentation should identify the applicable quality management certifications and their scope. Where a customer program requires PPAP Level 3, the submission package can be defined around the customer's requirements, including process flow, PFMEA, control plan, material records, dimensional results, and process capability data where applicable.

 

Recommended Inspection Plan

 

Inspection stage	Control item	Evidence or record
Incoming material	Grade, thickness and surface condition	Material certificate and incoming inspection
Laser cutting	Cut dimensions, openings and edge condition	Dimensional inspection
CNC bending	Bend angle, flange length and panel geometry	In-process measurement
Welding	Joint condition, continuity, and distortion	Weld inspection and specified test results
Surface finishing	Coating appearance, thickness and adhesion	Coating inspection report
Final assembly	Door alignment, mounting interfaces, and fasteners	Assembly inspection record
Electrical verification	Grounding continuity and dielectric tests where required	Electrical test records
Environmental qualification	IP rating and corrosion testing where specified	Test report for the relevant configuration
Customer quality submission	PPAP or other required quality documents	Approved project-specific submission package

 

Traceability and Production Release
For repeat production, the control plan should define how material lots, drawing revisions, tooling changes, and finishing batches are linked to the completed cabinets. Any deviation affecting dimensions, surface protection or assembly interfaces should be reviewed before shipment.

 

Packaging should protect painted surfaces, door edges, mounting plates and projecting fittings against abrasion and impact during handling. The packaging method, labels, and shipping documentation should follow the customer's delivery requirements.

 

 

 

Send Apollo your cabinet drawings and installation requirements for an engineering review before production. The review can address material selection, panel thickness, laser-cut openings, bend geometry, welded joints, door sealing, mounting interfaces, and the inspection scope.

 

Submit 2D drawings in .DWG or PDF format, 3D CAD models in STEP format, or a specification containing cabinet dimensions, material grade, sheet thickness, surface finish, environmental conditions, and required protection rating.

 

For projects requiring IP65/IP66 protection, electrical safety verification, or specific corrosion tests, include the applicable standards and acceptance criteria. This allows the manufacturing team to assess the required processes and testing scope before quotation.

 

Request a preliminary DFM review and factory-direct quotation. A 24-hour response target can be arranged for complete inquiries, subject to drawing complexity and the information provided.