GGD low-voltage distribution cabinet
- Main busbar: tinned TMY copper, torqued to 30-40 N·m, witness-marked at every joint for re-checking
- Enclosure: 2.0 mm cold-rolled carbon steel, seam-welded, diagonal ≤1.5 mm, IP54 standard / IP65 optional
- Components: Schneider / ABB / Siemens / Chint (as confirmed per project); customer-supplied components accepted
- Assembly: metering and power factor correction cabinets can be integrated; inter-cabinet busbars run through and ship as a complete section
- Testing: 100% continuity and powered functional test on every unit, including insulation resistance and 2500 V/1 min withstand
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.
| Type | GGD-type AC low-voltage switchgear assembly, fixed-panel, parallel-coupled construction |
|---|---|
| Standard sizes (W×D×H) | 800×600×2200 / 1000×600×2200 / 1200×800×2200 mm; up to 8 cabinets in one parallel run |
| Enclosure construction | 2.0 mm cold-rolled carbon steel, seam-welded, with reinforcing ribs; electrostatic powder coating |
| Cabinet diagonal | ≤1.5 mm (this is what makes the door seal — and therefore IP54 / IP65 — mean anything) |
| Surface treatment | Degrease → derust → phosphating → electrostatic powder coating 60-80 μm, baked at 200 °C for 30 minutes |
| Door & locking | Single or double door, 180° hinges, multi-point compression lock, optional window in the inner door |
| Cable entry | Bottom entry (busway or cable); top busbar trunking can be added |
| IP rating | IP54 standard / IP65 optional (GB 4208 / IEC 60529) |
| Installation | Floor-standing against or away from the wall, on a channel-steel base; inter-cabinet busbars coupled through |
| Rated operating voltage | Main circuit AC 380V / 400V, 50 Hz; control circuit AC 220V or DC 24V |
|---|---|
| Rated current | Horizontal busbar ≤2000 A, vertical busbar ≤1000 A |
| Rated short-time withstand current Icw | 30 kA / 50 kA / 65 kA (matched to the breaking capacity of the main device) |
| Main busbar | Tinned TMY copper busbar, torqued to 30-40 N·m, witness-marked at every joint |
| Neutral and earth bars | Run through the full section, sized at half the main busbar; PE bar grounded at multiple points, ground resistance ≤4 Ω |
| Main incoming device | Air circuit breaker (ACB) or high-current molded case circuit breaker (MCCB); withdrawable or fixed |
| Outgoing circuits | MCCB + contactor + thermal relay combinations; electronic motor protection relays optional |
| Power factor correction | Capacitor correction cabinet can be integrated, with automatic staged switching and optional inrush-limiting reactors |
| Metering | Metering cabinet can be integrated; multifunction power meters and CTs installed in separate compartments |
| Changeover | Optional ATS (PC class or CB class) or manual changeover switch |
| Component brands | Schneider / ABB / Siemens / Chint (as confirmed per project); customer-supplied components accepted |
| Single-unit base scheme | Main incoming + N outgoing ways, with multifunction power meter and status indicators |
|---|---|
| Incoming + metering + correction | Incoming cabinet + metering cabinet + capacitor correction cabinet, three cabinets in one run |
| ATS changeover scheme | Two mains incoming feeders + automatic changeover + outgoing ways, with undervoltage, overvoltage and phase-loss protection |
| Motor control scheme | Main incoming + multiple MCC control units, each with start/stop pushbuttons, status indication and overload protection |
| Fire-mode shutdown scheme | Main incoming + emergency lighting outgoing + fire-mode forced shutdown, per GB 50052 |
| Type designation | GGD1 incoming / GGD2 metering / GGD3 correction / GGD4 outgoing & motor; single units or complete runs |
| Assembly standard | GB/T 7251.1 / IEC 61439-1; type test reports available on request |
|---|---|
| IP rating | GB 4208 / IEC 60529; IP54 tested at the factory, IP65 configured per order |
| Clearance & creepage | Complies with GB/T 7251.1 pollution degree 3, overvoltage category IV |
| Temperature rise | Main busbar, joints and terminals ≤70 K |
| Short-time withstand | 30 kA / 50 kA / 65 kA · 1 s (matched to the main device breaking capacity) |
| Routine tests (every unit) | Mechanical operation, circuit resistance, insulation resistance (≥1 MΩ), power-frequency withstand 2500 V/1 min, ground continuity, powered functional test |
| Documents with shipment | As-built schematic, terminal schedule, BOM with brand and model, routine test report, dispatch photos, packing list |
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.
Busbar torqued and witness-marked
Main busbar joints are torqued to 30-40 N·m with a torque wrench and marked with a witness line, so a loose joint is visible at a glance during inspection.
Cabinet diagonal held tight
Every enclosure is measured for diagonal after cutting and bending; anything over 1.5 mm goes back for rework. Even door-seal compression — and therefore IP54 / IP65 — depends on it.
Temperature rise at busbar joints
Main busbar, joints and terminals are held at ≤70 K, with measured values from routine testing delivered with the report.
Busbars, cables and control wiring kept apart
The main busbar compartment and the cable outgoing compartment are physically separated, and control wiring runs in its own duct. Lower EMI, and later maintenance does not disturb the main circuit.
Phosphating before electrostatic coating
After degreasing, derusting and phosphating, powder is applied electrostatically at 60-80 μm and baked at 200 °C for 30 minutes. Film thickness records can be supplied with the file.
Per-unit withstand and powered test
Every unit gets mechanical operation, circuit resistance, insulation resistance, power-frequency withstand 2500 V/1 min, ground continuity and a powered functional test — the report travels with the cabinet.
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.
Main incoming in a factory switch room
Main cabinet on the LV side of a 10/0.4 kV transformer, with ACB and main busbar.
Workshop sub-distribution
Outgoing cabinets zoned by process, each serving one production line or one high-power machine.
Complete correction run
Capacitor correction cabinets paralleled after the main incoming, with automatic staged switching to raise the power factor.
Commercial & building distribution
Zoned distribution for HVAC, power, fire and emergency lighting in malls, offices and hotels.
Municipal facilities
Main incoming and outgoing for water plants, pump stations, tunnels and bridges.
LV side of new energy sites
AC-side collection and distribution inside PV, storage and charging sites, working with the grid-connection cabinet.
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 buyer's electrical engineer. No contact details required, download directly.
Six questions procurement and electrical engineers ask most
GGD vs MNS vs GCK — which should I choose?
GGD is a fixed-panel type: simple, straightforward to maintain, well suited to the incoming and outgoing feeders of a factory distribution room. MNS and GCK are drawer types, where units can be withdrawn for maintenance — better for main circuits that are switched frequently. Mixed use within one project is common: GGD for the incoming, drawer cabinets for the outgoing feeders.
How do I choose the main busbar, and should it be tinned?
Size the TMY copper busbar to the rated current: 60×6 or 80×6 for 1,000 A, 100×10 for 1,600 A, and doubled bars (2×(80×8)) for 2,000 A. In damp or corrosive environments, tinning is recommended — it significantly slows the rise in contact resistance. We tin TMY as standard and mark the torque with a witness line for traceability.
How big should the power factor correction cabinet be, and how are the stages sized?
Total compensation is usually estimated at 20%-40% of transformer capacity, with the load power factor deciding the final figure. Staging is typically 4-8 steps, switched one at a time to avoid inrush. Inrush-limiting reactors (7% or 14% impedance) are chosen according to the harmonic environment — recommended where VFDs or rectifier loads are present.
Can you build to our single-line diagram? Can we specify component brands?
Yes. Send us the single-line diagram, primary scheme and load list. You can specify component brands (Schneider, ABB, Siemens, Chint and others), or leave the selection to us based on engineering experience. Customer-supplied components sent to our factory are also fine — we inspect them on arrival before assembly.
Do you ship a complete run assembled, or in sections?
A single section takes up to 8 cabinets in parallel. Beyond 8, we recommend splitting into two sections with separate incoming feeders, so the busbar run does not become so long that end voltage drop and short-circuit capacity no longer match. With fewer cabinets we run the inter-cabinet busbars through and ship the section complete. With more cabinets, or where transport dimensions are limiting, we ship in sections — but the inter-cabinet bars are pre-fabricated and bolted on site. Finished and packed photos are provided before dispatch so you can plan the switch room in advance.
IP54 or IP65 — which should I choose for a distribution room?
Inside a clean distribution room, IP54 is sufficient: dust-protected and splash-resistant. For damp locations, basements, tunnel portals or dusty environments, IP65 is recommended. Upgrading to IP65 mainly means a thicker door gasket and sealed cable glands, with a water-spray test at the factory.
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.
Planning a switch room upgrade or a new build?
Free drawing review · quote within 24 hours · build directly from your single-line diagram · complete runs shipped. Direct from the source factory, MOQ 1, 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.