Double-door enclosures
- Configuration: 800–1200 mm wide dual front doors, or 600 mm and up with front + rear doors (maintenance type)
- Locking: three-point interlocking lock (top, center and bottom compression points), with a vertical post supporting the center on wide enclosures
- Sealing: full-perimeter foamed gasket on the door frame; dual gasket runs butt and compress at the center seam of double doors
- Zoning: front door operating zone + rear door maintenance zone; maintenance does not interrupt operation on the operating face
- Protection: IP54 standard / IP65 optional (GB 4208 / IEC 60529)
Specifications
The table below covers 80% of factory distribution room cases. Anything outside it we can still build — those are engineered items, quoted separately, with an indicative price the same day.
| Standard sizes (W×D×H) | 800×600×1800 / 1000×800×2000 / 1200×800×2000 mm (dual front doors), custom sizes available |
|---|---|
| Door configuration | Dual front doors (wide enclosures) / front door + rear maintenance door (separated type); combinations of the same size available |
| Sheet thickness | Door panel 1.5–2.0 mm, frame post 2.0–2.5 mm |
| Center seam construction | Double-door center seam vertical post + dual gasket compression seal |
| Lock | Three-point latching lock ×2 (one per door); keyed alike or keyed differently, optional |
| Hinge | Exposed hinge, 180° opening (standard) / concealed hinge (architectural style) |
| Surface treatment | Nine-stage pretreatment + electrostatic powder coating, RAL7035 |
| IP rating | IP54 standard / IP65 optional |
| Rated load capacity | Uniformly distributed frame load ≤400 kg |
|---|---|
| Zoning | Front zone: operator panel (pushbuttons / meters / HMI); rear zone: wiring and service access |
| Internal partition | Optional partition between front and rear zones (with cable pass-throughs); operator side isolated from live parts |
| Door load capacity | When HMI or meters are door-mounted on the front door, add a door stay sized to the weight; no door-mounted devices on the rear door |
| Grounding | Bonding braid from each door to the frame |
| Cooling | Optional independent airflow paths for front and rear zones |
| Wide cabinet, double front doors | On cabinets ≥800 mm wide, a single door is too heavy; double front doors operate more easily and extend hinge life |
|---|---|
| Front/rear zoned type | Front door for operation + rear door for service, so service work is not done facing the operator side |
| Three-layer with inner door | Outer door carries pushbuttons, inner door shields live parts, rear door routes wiring — three-layer construction |
| Double-door cabinet lineup | When cabinets are joined into a lineup, double-door configuration stays uniform and the center seam vertical post is shared |
| Outdoor double door | Double doors + rain canopy + outdoor coating, for outdoor pump house / station house applications |
| Custom build | Asymmetric door widths, special locks, machined to drawing |
| Structural standard | GB/T 7251.1 / IEC 61439-1 (mechanical structure section) |
|---|---|
| Door sag check | After the door is held open at 90°, door edge sag ≤1.5 mm (every unit) |
| Seal check | Continuous full-perimeter compression marks from the dual center-seam gaskets + three-point compression on each door, visually inspected unit by unit |
| Load test | 1.25× rated load, static; no permanent frame deformation |
| Documents with shipment | Outline drawing, door and lock point layout drawing, material certificate |
Five steps to specify your run
A configuration summary is generated as you go. It travels with your inquiry, saving a round of confirmation.
Build details
Systems have been in service for decades, and the failure points are always the same few: poor busbar contact, water ingress at the door seal, high temperature rise in the correction cabinet, and mis-phased outgoing feeders. The six hard rules below are written for exactly these points — every cabinet can be traced to them.
The pivot that keeps wide doors from sagging
A fixed vertical post runs down the center of the double front doors, and each door presses its own gasket against one side of that post. Without this post, the middle of a wide door sags and pulls the center seam gasket open.
One turn, three points clamped
A single turn of the lock cylinder clamps the top, middle and bottom points at once, so the gasket around the door frame is loaded evenly. A single-point lock on a 2 m tall cabinet will always be loose at the bottom and tight at the top.
Still true after ten years of opening and closing
Every cabinet is checked for door-end sag after the door has been held open at 90°. The hinge reinforcement plate on the door leaf and the hinge point sets this number. A door out of tolerance will stop closing properly within three years.
No live parts on the operating face
The partition between the front and rear compartments has a grommeted cable pass-through. The operator tightens terminals on the front side while the live parts stay behind the partition. Zoning is not a marketing word — it is this steel plate.
Separate maintenance access
The front door operating lock and the rear door maintenance lock can be supplied with different keys, so maintenance access is controlled separately and the wrong door is not opened by mistake.
Static does not build up on the door
Each door is individually bonded to the frame with a braided strap. A door is a moving part — leave it unbonded and it is a floating metal component.
Photos & enclosure construction
Below are photos taken in our own shop — from the complete unit down to the internal busbars and secondary wiring. Every build detail can be checked item by item.
Image key: 01–05 are shop photos (the numbers match the shot list). The line drawing shows the front elevation of the enclosure; dimensions match the specification table above.
Where these cabinets go
These are the routine applications — we can talk scheme and configuration directly. For the industry view, see the industry pages.
Production line main control cabinet
Main control cabinet for a production line, with HMI and pushbuttons on the front door and maintenance access from the rear door.
Distribution and Metering Compartments
Operation face and metering / busbar compartments are separated, so meter reading and maintenance do not interfere with each other.
Wide-Body Equipment Cabinet
Cabinets 800 mm and wider come standard with double front doors — each door is lighter, and the hinges last longer.
Outdoor Station Building
Double outdoor doors plus a rain canopy allow maintenance from both sides for pump houses and base stations.
Interconnected Cabinet Rows on the Shop Floor
Double-door cabinets form a uniform row and line up with floor-standing server cabinets.
Retrofit Compartments
Convert an old single-door cabinet to a double-door compartment layout, built to the original cabinet footprint.
Commercial terms
Specification dated September 2026; quotations follow this.
| Drawings & design | Free |
| MOQ | 1 unit (5 or more recommended for production) |
| Production lead time | 15-25 days after drawing approval |
| on-time delivery | 98% |
| Warranty | 12 months |
| Loading port | Ningbo / Shanghai, China |
| Sheet steel | Baosteel / Ansteel cold-rolled sheet (SPCC) / 304 stainless steel |
| Factory visit & dispatch confirmation | Factory visits welcome; finished-cabinet photos and video before dispatch |
| Capacity | 5,800+ units / year |
Documents for your engineering team
Selection manual, outline dimensions and RFQ checklist — for the customer's electrical engineer. All three documents are being organized by product line; download links go live once complete.
Six questions procurement and electrical engineers ask most
Why must a wide cabinet have double doors?
Above 800 mm, a single door is heavy and puts an offset load on the hinges, so it visibly sags after repeated opening and closing. With double front doors, each leaf weighs half as much, and the three-point lock pulls it tight. This is not a cost trade-off — it is basic structural sense.
Do both front and rear doors need to be opened often?
No. The front door is the operation face and stays closed in normal service; the rear door is for maintenance. The whole point of a compartment layout is that maintenance never touches the operation face, so the HMI stays powered.
Will water seep through the center seam?
Two seals butt and compress against both sides of the vertical post, and the compression mark is checked cabinet by cabinet for a continuous run all the way around — far more reliable than a single seal butted together at the door gap.
Can both doors use one key?
Yes — either a common key or two separate keys. We recommend two keys: the front door for the operator, the rear door for the electrician, so access is clearly divided.
Is an inner door (three-layer construction) necessary?
Where live parts on the operation face need protection — public areas, or workshops where non-electricians may come into contact — we recommend adding an inner door. In a closed electrical room, it can be simplified.
Is lead time the same as a single-door cabinet?
Yes, 15–25 days. The extra door and vertical post work fits within normal scheduling, with no expedite fee and no impact.
Other cabinet types in the same main circuit
Related products use color-block placeholders for now (product photos not yet complete; they will be replaced together). Internal links will be filled in once live URLs are confirmed.
Send drawings for wide cabinets and compartment requirements, and we will define the door format
Send us your cabinet footprint and operation-face layout, and we will provide a free double-door compartment plan and quote · reply within 24 hours · build-to-drawing customization supported. Direct from the source factory, MOQ 1 unit, 15–25 day delivery, 1-year warranty.
ISO 9001:2015 · CE(LVD+EMC) · CQC · IP65
When you write, include: single-line diagram or primary scheme, switch room layout, load list, and component brand requirements. You do not need complete drawings — capacity and cabinet type are enough to start.