Sourcing motor terminal boxes from China
Electric motor terminal boxes classified as motor parts under heading 8503 normally pay 2% UK duty from China. The main classification rule is suitability solely or principally for motors or generators; confirm the supplied assembly rather than relying on its name. Cambridge China Bridge sources electric motor terminal boxes.
Duty on motor-specific terminal boxes
Read from the UK Trade Tariff on 19 October 2026, heading 8503 covers parts suitable solely or principally for motors or generators. For motor-specific terminal boxes, the candidate lines are 8503 00 91 99 for cast iron or cast steel and 8503 00 98 99 for other materials. The table separates material variants sharing these codes.
Both candidate lines carry 2% duty from China, with no anti-dumping or countervailing measure recorded. Their 0.00 % authorised-use suspension concerns manufacture of offshore wind turbine rotors. The other suspension on 8503 00 98 99 names particular motor parts, not ordinary terminal boxes. That line also attaches a supplementary-unit import measure; confirm the declaration requirement with your customs broker.
Send the drawing, material specification, motor application and details of any fitted terminals to your broker to confirm the commodity code. For the wider motor-parts heading, see motor end shields.
| Goods | Commodity code | Duty | Anti-dumping or countervailing duty on China |
|---|---|---|---|
| Cast iron motor terminal boxes | 8503 00 91 99 | 2% | None |
| Aluminium motor terminal boxes | 8503 00 98 99 | 2% | None |
Specify the mounting face, lid and cable entries
State whether you want an empty enclosure or a box fitted with terminals, links, glands and an earthing connection. Specify material, mounting-hole positions, flange flatness, lid clearance, cable-entry threads, gasket material and fasteners. Supply a mating motor drawing and approve a sample assembled on the actual motor.
For component parts supplied to a motor maker, confirm with the relevant product safety authority whether UKCA or CE marking is required for the supplied part or the finished motor or machine. Official hazardous-substance guidance excludes component parts sold on a business-to-business basis from its scope. Ask for material information for the enclosure, coating, gasket and fitted parts to support your customer's assessment.
Worked duty example
Illustrative example, not a quote: Illustrative order of 600 aluminium motor terminal boxes under 8503 00 98 99, invoiced at £12,000 free on board, with £600 of freight and insurance to the UK. The customs value is £12,600. Duty at 2% is £252. Import VAT at 20% is charged on the customs value plus duty, £12,852, so it is £2,570.40. Import taxes total £2,822.40; a VAT-registered importer can usually reclaim the VAT, so the lasting cost is the £252 of duty. The import duty and VAT guide explains each step.
Inspection checklist
Fit: assemble sampled boxes on the mating motor; check mounting holes, flange contact, lid access and clearance around internal connections.
Sealing: check gasket seating, lid distortion, cable-entry threads and blanking plugs; assess sealing with the agreed glands and fitted lid.
Material: compare material records and coating with the drawing; inspect castings for cracks, porosity and damaged sealing faces.
Arrival: check loose fasteners, damaged threads, crushed lids and moisture inside packaging. Compare supplied terminals and links with the approved sample.
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What goes wrong
A box can match the outside dimensions yet fail to fit because its flange or mounting holes differ. Paint on the gasket seat, a distorted lid or mismatched gland threads can compromise sealing. Internal ribs can obstruct cable lugs even when the lid closes.
Keep the approved assembly sample and require approval before changes to the casting, gasket or fitted terminals. Inspect the finished assembly rather than only the empty casting; agree the checks through quality inspection.
Cambridge China Bridge sources these products for UK businesses, checking the factory and the documents before shipment. See factory verification. For components and parts, see sourcing for manufacturers.
Frequently asked questions
What is the UK import duty on motor terminal boxes from China?
The candidate motor-parts lines carry 2% duty. Recorded suspensions concern specified parts or authorised offshore wind rotor manufacture, rather than ordinary terminal-box orders.
Which commodity code applies to a motor terminal box?
For boxes classified as motor parts, candidate codes are 8503 00 91 99 for cast iron or cast steel and 8503 00 98 99 for other materials. Confirm the complete supplied assembly with your broker.
Should I order an empty box or a fitted terminal box?
Specify this explicitly. A fitted order should identify terminals, links, glands, blanking plugs and the earthing connection, with an approved assembly sample.
How do I check whether the box fits my motor?
Use the mating motor drawing and assemble a sample on the motor. Check the flange, mounting holes, cable-lug clearance, lid access and gland installation.