Power Extension Cord Manufacturers

Our Extension Cord Range

The range is organised by regional plug system and application. Standard US and UK extension cords serve household, commercial and light industrial power distribution. EV extension cords extend charging reach for electric vehicle owners and fleet operators. Heavy-duty generator and RV cords share the same conductor and moulding platform but use locking plugs and higher current ratings.

US Extension Cord Configurations

US models cover 15 A and 20 A household duty through 30 A generator and RV duty. Conductor sizes range from 16 AWG to 10 AWG depending on current and run length. Jackets are available in SJT, SJTW and STW grades for indoor, outdoor and heavy-duty use.

• ZJ-001 and ZJ-002: general-purpose US extension cords for retail and OEM supply
• ZJ-2XZ and ZJ-2ZB: multi-outlet configurations for workshop and jobsite distribution
• NEMA L5-30P/L5-30R and L14-30P/L14-30R: locking generator cords for transfer switch and inlet box connections
• TT-30P to L5-30R: RV trailer and camper adaptor cords with cord organiser
• L5-30P to triple 5-15R: 30 A to 15 A distribution adaptor with lighted end

UK Extension Cord Configurations

UK models use the BS1363 Type G three-pin plug and socket system. We mould the plug body, fuse carrier and socket contacts in-house, then assemble the cord set with the required cable length and current rating. Fused plugs are standard for UK compliance.

• ZJ06: BS1363 UK power cord with Britain 3-prong Type G plug
• ZJ07: UK 3-prong extension cord with BS1363 plug and power extender socket

EV Extension Cord Range

EV extension cords extend the reach between a charging station and the vehicle inlet. They use J1772 Type 1 and Type 2 connectors or GB/T connectors, with conductor sizing selected for continuous charging current rather than intermittent loads. Cable jackets are formulated for outdoor UV exposure and repeated flexing.

We build EV extension cords as part of our broader EV charging solution line, which also includes EV chargers and charging connectors. This lets us match the extension cord to the charger output and vehicle inlet in one configuration.

Materials and Construction

We operate our own granulation and processing plant, so conductor insulation and jacket compounds are produced under our control. Copper conductors are stranded for flexibility. Plug and socket bodies are injection moulded from PVC or rubber compounds depending on the required temperature range and outdoor rating.

• Conductor: stranded copper, 16 AWG to 10 AWG
• Insulation and jacket: PVC, rubber or TPE depending on application
• Plug bodies: moulded PVC or rubber with brass or copper alloy contacts
• Outdoor grades: UV-stabilised jacket compounds and sealed moulded ends

Quality Control and Acceptance

Our factory runs under the ISO 9001 quality management system. Every production stage is subject to inspection, and finished extension cords are tested in our in-house lab before packing. Certificates of compliance E529560, E325763 and E321611 cover c(UL)us and related safety marks. ETL and CE certification apply to relevant product lines.

Acceptance testing can include continuity, polarity, insulation resistance, high-potential withstand and dimensional checks. We can supply test records with shipments when the project requires documented evidence.

Information We Use to Configure Your Solution

To prepare a suitable extension cord configuration and quotation, we need the following project inputs. The more precisely these are defined, the faster we can confirm the design and price.

Customization, Documentation and Support

Our R&D team develops extension cords from customer drawings or samples. Customization covers plug type, cord length, conductor gauge, jacket colour, socket configuration, branding and retail packaging. We can also produce woven braid cables for visible or decorative runs.

Documentation includes product manuals and installation guidance. For OEM programs we provide the technical file needed for the customer's own certification or market approval. Spare parts and replacement cords are available for ongoing programs.

Frequently Asked Questions

What extension cord types does Zhenjia manufacture?

We manufacture US extension cords, UK extension cords and EV extension cords, plus heavy-duty generator and RV cords. The range covers NEMA 5-15, 5-20, L5-30, L14-30 and TT-30 configurations, BS1363 Type G plugs, and J1772 Type 1 and Type 2 EV connectors.

Can you produce extension cords to our own specifications?

Yes. Our R&D team develops products from customer drawings or samples. We can adjust plug type, conductor gauge, cord length, jacket material, socket count, colour and packaging to match the project requirement.

What certifications apply to your extension cords?

Our factory operates under ISO 9001. Products hold c(UL)us, ETL and CE certification as applicable to the product line. Certificates of compliance E529560, E325763 and E321611 are available for verification.

How do you control quality during production?

Every production stage is inspected under our ISO 9001 system. Finished cords are tested in our in-house lab for continuity, polarity, insulation resistance and high-potential withstand before packing. Test records can be supplied with shipments.

What information do you need to quote an extension cord project?

We need the plug standard, voltage and current rating, cord length, jacket type, end-use environment, outlet count, colour and branding requirements, target quantity and delivery schedule. With these inputs we can confirm the configuration and prepare a quotation.