Final distribution boards
- Circuits: separate lighting / socket / air conditioning / kitchen and bathroom circuits, 1P+N modular MCBs
- Residual current: 30 mA residual current modules on wet-location and socket circuits — the baseline for personnel safety
- Main switch: isolator or 2P MCB ≤63 A with isolation indication
- Enclosure: flush mount (rough-in frame + trim frame) / surface mount, usable depth according to circuit count
- Labels: circuit labels and system drawing ship with the goods — no guesswork at handover inspection
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.
| Enclosure type | Flush mount (rough-in frame + trim frame) / surface mount |
|---|---|
| Standard dimensions (W×H×D) | 8–45 ways depending on circuit count: 260×360×90 to 500×700×120 mm |
| Enclosure construction | 1.0–1.2 mm cold-rolled steel rough-in frame + trim frame, electrostatic powder coated |
| IP rating | IP30 (indoor recessed / surface mount) |
| Door and trim | Flush transparent door or no door, trim frame flush with the finished wall |
| Cable entry | Knockouts on top and bottom, flush-mount rough-in to drawing |
| Rated voltage | AC 220/380V, 50 Hz |
|---|---|
| main breaker | 2P / 3P isolator or MCB ≤63 A |
| outgoing feeders | 1P+N MCBs, 6–45 ways; C / D curve selected by load |
| RCD module | Socket / kitchen / bath circuits at 30 mA; main RCD 100/300 mA optional |
| Surge protection | Reserved SPD slots, Type 1 / Type 2 (buildings and standalone structures) |
| Neutral and ground bars | Separate N bar and PE bar, sized by circuit |
| Component brands | Chint / Schneider / ABB / Siemens, customer-supplied and shipped to factory accepted |
| Residential unit type | Lighting / socket / AC / kitchen / bath / bathroom heater circuits, 30 mA RCD on each |
|---|---|
| Apartment rental type | Sub-metering upstream (with meter box) + in-unit final circuits |
| Commercial storefront type | Multiple lighting circuits + sockets + dedicated AC line + storefront sign circuit |
| Office type | Workstation socket circuits and lighting on separate circuits; UPS slot reserved |
| Retrofit cabinet replacement type | Old box replacement: 1:1 on existing circuits, labels kept to site convention |
| Assembly standard | GB/T 7251.1 and GB/T 7251.3 (particular requirements for distribution boards) |
|---|---|
| Routine tests (every unit) | Insulation resistance, dielectric withstand, circuit-by-circuit continuity and RCD trip test |
| Temperature rise | Terminal connections ≤70 K |
| Label verification | Circuit labels checked against the system diagram, unit by unit |
| Documents with shipment | System diagram, circuit labels, BOM, test report |
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.
Circuits by use
Lighting, sockets, AC, and kitchen/bath each run on their own circuit: a fault affects the smallest possible area, and when a breaker trips you know where to look. Circuits are divided by use, not by room count — that is the basics of a terminal box.
Phase and neutral break together
Outgoing circuits use 1P+N double-break MCBs: phase and neutral open together during service, so even the wrong wire is dead — costs only a few yuan more per pole than single-break 1P, but a different order of safety.
30 mA on damp circuits
Receptacle, kitchen and bathroom circuits all get 30 mA leakage protection — personal safety is not a cost-benefit question. The main leakage device handles fire protection (300 mA); the two levels work independently.
No flying leads
Distribution is crimped onto a comb busbar — no wire knots inside the box. Adding a circuit later means pulling one slot and plugging in; existing wiring stays untouched.
No guesswork at handover
Circuit labels plus a laminated system diagram inside the door ship with the box. At handover, read the diagram and call out the names — anyone can see which breaker controls which circuit.
No rework on flush mounts
Flush-mount boxes are sized with enough clear depth for wire gauge and bend radius, and the rough-in frame is leveled during installation — ten extra minutes at the civil works stage means no wall demolition later.
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.
New residential builds and whole-home renovations
Circuit plans by unit layout, done right the first time.
Apartments and rental units
Per-unit terminals plus metering provisions for clear management.
Commercial storefronts and food service
Separate lighting, receptacle and AC circuits; dedicated kitchen lines.
Office workstations
Zoned receptacle and lighting circuits per workstation, with UPS provisions.
Standalone buildings and villas
Multiple boxes across floors plus SPD surge protection.
Old panel replacement
1:1 replacement against existing circuits, keeping familiar labels.
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 |
| Component brands | Schneider / ABB / Siemens / Chint |
| 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
How many circuits do I need?
By function, not by room: 2–3 lighting circuits, 2–3 general receptacle circuits, 1 circuit per AC unit, 1–2 kitchen circuits, 1 bathroom circuit, plus 20% spare. A three-bedroom home typically runs 18–24 ways. Send us your floor plan and we will produce a circuit schedule free of charge.
1P or 1P+N?
1P breaks only the phase; 1P+N breaks phase and neutral together. During service, the neutral can carry voltage from another circuit — 1P+N isolates cleanly. The price difference is a few yuan per pole. We default to 1P+N rather than save small change and leave a hazard.
Leakage protection on the main or on branch circuits?
Personal protection comes from 30 mA branch devices (receptacles / kitchen / bathroom); fire protection comes from a 100/300 mA main device — the two levels work together. A main device alone saves money, but one leaking circuit blacks out the whole home. On a tight budget, at minimum put branch leakage protection on damp locations.
When does the flush-mount box arrive on site?
The rough-in frame arrives before plastering (cutout dimension drawings ship with it); the trim frame and door go in during finish work — a two-stage delivery. Finalize the system diagram before electrical rough-in to avoid changing circuits on site.
Can SPD be included?
Yes: standalone buildings and end-of-line supply points should have a Type 2 SPD module (plug-in, replaceable when degraded); buildings with upstream distribution room protection can simplify. In high-lightning areas, specify SPD as standard.
What should I watch for when replacing an old panel?
Three things to check: circuit-by-circuit 1:1 correspondence (keep the original numbering), incoming supply spec verification (does the old wire gauge match the new breaker), and grounding confirmation (for older homes with no ground wire, resolve the grounding first or use residual current protection as an alternative). Send photos for a free assessment.
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 your floor plan — circuit schedule at no charge
Send your floor plan or circuit requirements and we will provide a circuit division and enclosure plan at no charge · Quotation within 24 hours. Direct from the source factory, MOQ 1 unit, 15–25 day lead time, 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.