Quick answer
Compare transformer bids only after each accessory is marked as included, optional with a price, supplied loose, installed by another party, excluded, or still pending. Then connect the marked scope to the equipment rating, terminal arrangement, control wiring, tests, drawings, packing and delivery boundary. A quotation that says “complete accessories” is not comparable until the item identities, quantities, responsibility and evidence are visible.
Why accessory wording changes the commercial result
Two suppliers can quote the same capacity and still transfer different installation and acceptance work to the buyer. One may include a temperature indicator, cable box, alarm contacts and final drawings; another may price them as options or leave them to the installer.
Start with the approved single-line diagram, data sheet and site conditions. Decide which functions are required, and mark unresolved choices as open items rather than accepting a supplier default.
Use the project specification and the offered configuration to define the commercial baseline. A general standard reference does not create one universal accessory list or decide which party supplies an interface; the quoted Jinxing configuration and project documents must do that.
Build an included-versus-optional schedule
Ask every bidder to complete one common schedule. Keep the wording specific enough that procurement, engineering and installation teams can read the same boundary.
| Accessory or deliverable | Bid status to record | Buyer question | Evidence to request |
|---|---|---|---|
| Tap equipment or links | Factory-fitted, loose, optional or excluded | Is the selected range needed for the operating voltage and maintenance method? | Data sheet, tap diagram and price delta |
| HV/LV terminals | Included arrangement or priced alternative | Are bushings, cable boxes, lugs, covers and mating parts part of the same interface? | Terminal drawing and responsibility matrix |
| Temperature devices | Indicator, controller, alarm, trip, sensor or not included | Which contacts, supply, wiring and receiving-system points are required? | Wiring diagram, contact schedule and test method |
| Cooling and ventilation | Natural, fan-assisted, controls or excluded | Does the offered cooling duty match the load and site environment? | Cooling statement, control logic and inspection record |
| Protection and monitoring | Relay, pressure device, oil level or other project item | Is the device required by the protection philosophy, and who sets or tests it? | Approved protection schedule and applicable report |
| Enclosure and earthing | Enclosure, barriers, earth terminals and hardware | What is the environmental, access and connection requirement? | General arrangement, earthing drawing and material scope |
| Spares and documents | Commissioning items, operating spares, manuals and certificates | Which records belong to the delivered serial number and which parts are consumables? | Spare list, document register and packing list |
The schedule is a comparison tool, not a declaration that every listed function is available on every transformer. The supplier and project engineer must confirm the actual design.
Separate factory-fitted, supplied-loose and site-installed work
“Included” still needs a location and an owner. A factory-fitted device can change wiring and tests; a loose component can transfer storage, mounting and commissioning to the site team. An excluded item may require another supplier’s drawing.
For each line, record the factory boundary, loose parts, field work and test record. If a cable box is included but its termination is excluded, show where the transformer supplier’s work ends.
A supplier catalogue may separate standard fittings and priced options, but that wording does not prove the same default or option set for a Jinxing transformer. Confirm each item, quantity, interface and responsibility against the actual quotation and project documents.
Price the option against the same technical baseline
An option should be compared with the base offer using the same voltage, capacity, impedance, cooling, terminal arrangement, enclosure, tests and delivery terms. Ask the supplier to show:
- the original configuration and the requested option;
- the equipment, wiring, dimensions and weight affected by the change;
- the price, currency, validity and schedule effect;
- the drawing, report, certificate or manual that changes;
- the installation, commissioning and maintenance responsibility;
- any assumptions that remain open.
Do not add every option together automatically. Some choices are alternatives, while others are additions. For example, a cable box may replace an exposed terminal arrangement; a temperature alarm may be an addition; a fan controller may be required only for a defined cooling duty. The comparison should show mutually exclusive choices and cumulative additions separately.
Link accessories to drawings, tests and handover
Accessory decisions often cross several documents: a relay or alarm contact changes wiring and signals, a cable box changes dimensions and terminations, and a cooling option changes controls and rating conditions.
Create a register with the quote number, option, affected drawing or test, reviewer and status. The existing transformer supplier quotation comparison checklist covers full like-for-like evaluation; this guide isolates accessory deltas. The oil-immersed transformer accessories checklist helps collect candidates, while this page asks bidders to price and allocate them. Use the transformer quotation page and project enquiry page to request an itemized response.
Example: two bids both say “complete”
Suppose two bids list the same capacity and voltage and both say complete. Bid A includes an alarm contact, cable box and wiring drawing; Bid B prices the alarm separately, supplies a terminal box loose and excludes cable termination. The lower total is not comparable until installation, testing, documents and interface work are added.
Return one marked schedule to both bidders, then select the arrangement that meets the approved connection and maintenance plan.
RFQ checklist
- Approved single-line diagram, ratings, duty, site conditions and destination.
- Common accessory schedule with status: included, optional, loose, excluded or pending.
- Factory-fitted versus field-installed responsibility for every line.
- Terminal, cable, earthing, control, protection and communications interfaces.
- Price, currency, validity, schedule and document effect for each option.
- Drawings, tests, certificates, manuals, spares and packing records affected.
- Mutually exclusive alternatives separated from cumulative additions.
- One approved baseline quotation and revision register before purchase order.
FAQ
Does “accessories included” mean the same thing in every transformer bid?
No. The phrase does not identify the device, quantity, installation location, wiring, evidence or responsible party. Request an itemized schedule tied to the offered configuration.
Should a buyer compare the optional accessory price on its own?
No. Compare the option with its effects on drawings, dimensions, wiring, tests, installation, maintenance and delivery. An isolated price can hide scope transferred to another contractor.
Can a supplier’s catalogue prove that Jinxing offers the same accessory?
No. A manufacturer catalogue is evidence about that manufacturer’s product family. Confirm the accessory, compatibility and document scope for the actual Jinxing quotation and project.
Evidence boundary
This draft uses the Jinxing product scope, quotation workflow and project-confirmation requirements. It contains no third-party brand or external website citation; accessory availability and test/document coverage remain subject to the actual quotation.