Sourcing insulating busbar supports from China
Insulating busbar supports from China under heading 8547 carry 0% UK duty across the relevant material lines. The heading covers insulating fittings with only minor moulded-in metal parts for assembly. Specify the material and mounting geometry, and check suitability for the finished equipment. Cambridge China Bridge sources insulating busbar supports.
0% UK duty on insulating busbar supports
Heading 8547 covers insulating fittings for electrical machines, appliances and equipment, wholly of insulating material except for minor metal components incorporated during moulding solely for assembly. For busbar supports, classify by material and construction. Insulators of heading 8546 are excluded. See the wider moulded insulating switchgear barriers guide.
Read from the UK Trade Tariff on 30 September 2026, the ceramic, plastic and other insulating-fitting lines carried 0% duty for goods from China. The supplied tariff data lists no anti-dumping or countervailing duties, suspensions or attached import controls. The plastic line appears twice in the table to distinguish stand-offs from support blocks.
Confirm the commodity code using the drawing, material specification, insert details and intended function. The separately listed mica battery-module component is outside this guide's scope. Import VAT is separate from duty; see UK import duty and VAT.
| Goods | Commodity code | Duty | Anti-dumping or countervailing duty on China |
|---|---|---|---|
| Ceramic insulating busbar supports | 8547 10 00 00 | 0% | None |
| Plastic insulating busbar stand-offs | 8547 20 00 00 | 0% | None |
| Busbar supports of other insulating materials | 8547 90 00 90 | 0% | None |
Specify the busbar seat, material and fixing
Provide a drawing showing support height, busbar width and thickness, seating profile, mounting-hole centres, thread details and tolerances. State the resin or ceramic grade, operating temperature, dielectric strength, flammability and tracking performance. Agree the mechanical loading, fixing torque and insert pull-out checks with the equipment designer before approving samples.
Ask for material certificates and test reports matched to the supplied grade and support design. Confirm with the relevant authority whether the hazardous-substance restrictions described in the site's insulating-fittings guide apply to the intended finished electrical product and its busbar supports. Obtain the supplier's restricted-substance declaration and supporting material evidence.
A finished product must comply with applicable legislation when placed on the Great Britain market. Use support samples in the intended assembly and check the evidence needed for that finished equipment. A material report alone does not establish the support's fit or mechanical performance; testing and certification can help define the checks.
Worked duty example
Illustrative example, not a quote: 10,000 plastic insulating busbar stand-offs, illustrative order under 8547 20 00 00, invoiced at £15,000 free on board, with £700 of freight and insurance to the UK. The customs value is £15,700. Duty at 0% is £0. Import VAT at 20% is charged on the customs value plus duty, £15,700, so it is £3,140. With no duty, the only import tax is the VAT, which a VAT-registered importer can usually reclaim. The import duty and VAT guide explains each step.
Inspection checklist
Material: match batch certificates to the agreed resin or ceramic grade and check any claimed flammability or tracking results against the supplied material.
Geometry: measure support height, busbar seats, mounting centres and threads on arrival; trial-fit samples with the intended busbar and mounting hardware.
Inserts and strength: check insert alignment, thread engagement and rotation, then perform the agreed torque, loading and pull-out checks.
Condition: inspect for cracks, voids, warping and flash, especially around inserts and busbar seats; compare bulk goods with the approved sample.
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What goes wrong
A support can match the catalogue outline but have the wrong seating profile or mounting centres. Resin substitution, moulding voids and warped seating faces can undermine the agreed performance. Loose inserts or cracked ceramics may only become apparent when the assembly is tightened.
Lock the drawing revision and material grade into the order. Approve samples in the intended assembly, keep batch evidence and inspect bulk goods against the agreed checks. Record arrival defects before fitting the supports. See quality inspection explained.
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 insulating busbar supports from China?
The relevant ceramic, plastic and other insulating-fitting lines under heading 8547 carried 0% duty in the supplied tariff data. No anti-dumping or countervailing duty was listed.
Which commodity code covers plastic busbar supports?
8547 20 00 00 covers insulating fittings of plastics. Confirm that the support's construction and function meet the heading description, including its restriction on metal components.
What should I put on a busbar-support drawing?
Specify material grade, support height, busbar seat, mounting centres, threads, inserts and tolerances. Agree temperature, electrical performance, loading and fixing torque with the equipment designer.
Is a resin test report enough to approve a support?
It supports the material claim, but does not establish mounting fit, insert retention or the finished assembly's performance. Check the supplied grade and test the support against the agreed drawing and application.