Metering boxes
- Meter positions: 1–12, single-phase / three-phase, mixed layouts available
- CTs: fitted on high-current circuits, 5 A / 1 A secondary, dedicated wiring route
- Reading: door-mounted viewing window for reading without opening; RS485 interface reserved for remote reading
- Sealing: separate sealing points for meter positions and wiring compartment, clear responsibility
- Branch protection: a breaker downstream of each meter, so overload and short circuit are isolated per circuit
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 | Indoor surface / flush mounting; outdoor models add a rain hood and IP54 |
|---|---|
| Standard dimensions (W×H×D) | By meter position count: 400×500×160 (4 positions) to 800×1200×250 (12 positions) mm, custom sizes available |
| Enclosure construction | 1.2–1.5 mm cold-rolled steel, electrostatic powder coated; stainless steel for corrosive environments |
| Viewing window | Transparent PC window covering all meter positions, for reading without opening the enclosure |
| Door and lock | Double doors (multi-position boxes), latch lock plus sealing point |
| Segregation | Metering compartment and wiring compartment are physically separated, each with its own door seal |
| Rated voltage | AC 220/380V, 50 Hz |
|---|---|
| Meter position specifications | Single-phase 5(60) A direct connection; three-phase direct connection or transformer-operated connection |
| Current transformers | CTs sized to circuit current (e.g., 200/5), accuracy class 0.5S / 0.2S available |
| Post-meter protection | Circuit breaker after each meter position, 1P+N for single-phase / 3P+N for three-phase |
| Secondary circuits | CT secondaries run independently with color-coded wiring (yellow/green/red), dedicated terminal blocks |
| Remote meter reading | RS485 / carrier collector mounting space and wiring holes reserved |
| Division of labor | Meter selection, calibration and sealing are the responsibility of the utility / owner; we supply the box and circuits |
| Rental factory type | Three-phase tenant metering via CTs + post-meter branch circuits, one meter per factory unit |
|---|---|
| Dormitory / apartment type | Dense layout of multiple single-phase meter positions, miniature circuit breaker after each meter |
| Retail / commercial type | Mixed single-phase + three-phase meter positions, common-area circuits listed separately |
| EV charging station metering type | Three-phase meter positions + charger feeder circuits, metering and distribution in one box |
| Rural grid JP type | Metering + distribution + compensation integrated (see JP rural grid integrated distribution box) |
| Assembly standard | GB/T 7251.1 / IEC 61439-1 |
|---|---|
| Secondary circuit inspection | CT secondary polarity and ratio verified unit by unit; open circuit prohibited |
| Routine tests (every unit) | Insulation resistance, withstand voltage, main circuit energization and secondary wiring verification |
| Temperature rise | Terminal and busbar connections ≤70 K |
| Documents with shipment | System diagram, CT ratio table, terminal table, 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.
Separate metering and wiring compartments
The metering compartment and the wiring compartment are physically separated, each with its own door seal and lead-seal points: meters stay with meters, wiring stays with wiring. When the utility or property management seals the meters, they do not touch our wiring — responsibility is clear.
CT wiring in dedicated runs
CT secondary wiring is color-coded yellow/green/red in dedicated wire ducts, with polarity and ratio verified unit by unit. The secondary side is never left open — an open circuit produces dangerous high voltage. This is an iron rule.
Read meters without opening the box
Transparent PC window covers all meter positions, so meters can be read without opening the door; the window and door seal are one piece, so dust and moisture protection is not sacrificed.
Meter position equals room number
Meter positions, downstream breakers and outgoing cable labels are numbered to match rooms / shop units one to one. Labels ship with the unit, so billing reconciliation needs no guesswork.
CT ratios documented
The CT ratio for every circuit is written into the ratio table shipped with the unit and affixed inside the enclosure door. When meters are replaced or verified, it is read straight off the sheet — no reliance on memory.
Air channels for dense meter positions
12-position dense meter layouts leave top and bottom ventilation channels, so a fully loaded box does not run hot in summer and electronic meters do not drift at high temperature.
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.
Leased factories and industrial parks
One meter per factory for tenant-level metering, with common-area loads listed separately.
Dormitories and apartments
Dense single-phase multi-position metering, with meter reading clear at a glance.
Shops and markets
Mixed single-phase and three-phase meter positions, configurable even for complex tenant mixes.
EV charging sites
Metering and feeder outlets in one enclosure — the metering point moves upstream.
Agricultural irrigation metering
Outdoor per-unit metering, one meter and one card per well.
Internal energy accounting
Sub-metering by workshop or process, so cost allocation has a basis.
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
Do you supply the meters?
We do not supply the meter itself by default — meters under utility jurisdiction are configured, verified and sealed by the power supply department; internal accounting meters can be purchased by the owner (we cut the openings to the meter's dimensions) or bought on your behalf. We handle the enclosure, CTs, secondary circuits and downstream protection, with responsibilities written into the contract.
Direct-connect or CT-operated — how do I choose?
For loop currents ≤60 A, use a direct-connect meter (5(60)A type); above 60 A or for high-current three-phase, use CT-operated metering (meter reading × CT ratio). The dividing line is the meter's rating, and we size it directly from the loop current.
How is the CT ratio determined?
Size the primary at 1.2–1.5 times the loop's maximum operating current, so normal load falls within the meter's accuracy band (30%–100% of rated current). Too large a ratio under-reads day-to-day; too small risks overload — send us the current list for each loop and we will recommend a ratio circuit by circuit.
Can it connect to remote meter reading?
An RS485 bus and collector mounting position are reserved; meters with a 485 port (supplied by the owner or the utility) are plug-and-play, and carrier-based reading gets a cable pass-through. The remote reading platform is generally provided by the meter manufacturer or the property manager; we make sure this section inside the enclosure is properly wired and ready to connect.
How large a multi-position box for rental units?
By meter positions and circuits: 12-position single-phase is typically 800×1200 mm; add common-area circuits or three-phase and go up one size. Send us the unit count and single/three-phase requirements and we will produce a layout drawing.
Will outdoor installation let water in?
Outdoor type with rain hood, double-door gasket and bottom cable glands, IP54 as standard; upgrade to IP65 for typhoon-prone or high-rainfall regions. A moisture-breathing valve at the bottom of the enclosure equalizes the temperature differential and condensation.
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 per-unit metering requirements and we will lay out the meter positions to match
Send us your circuit list (single/three-phase, current, meter positions) for a free metering plan and CT ratio recommendation · quote within 24 hours. 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.