The category
Power cable accessories as a purchase order line
What falls inside this line, where its boundary sits, and how to word it so the quotes that come back can be compared against each other.
Where the cable ends and the accessory begins
A purchase order settles one boundary before it settles anything else. The cable is bought against a cable standard. The accessory is bought against a different document, and in a bid the two are not interchangeable.
The practical test is the cut. Wherever a cable is cut, spliced, terminated or sealed, its insulation, its screen, its sheath and its armour each stop being continuous. Restoring or ending those four layers is accessory scope.
So check which side of that boundary your quoted standard sits on. An enquiry naming only the cable standard has specified nothing about the parts that end the cable. The standards page names the accessory families and tells you to verify the edition first.
For pricing, the category splits into six groups, named below with nothing said about what is inside any of them. The components are the manufacturer's business; the line item is yours.
The six groups, as they behave on a purchase order
- Jointing
- Priced per joint. The count is the number of cuts in the run, not the cores and not the parts consumed at each cut. Voltage class and construction each change the item, so one quantity across mixed constructions is not one line.
- Terminating
- Priced per cable end, then split by where that end sits — inside an enclosure or out in weather. A quantity silent about the split comes back priced as the cheaper one.
- Sealing and end capping
- Priced per end sealed. Most often left off the enquiry, then ordered twice: once for ends that must survive transit, again for ends sealed in service.
- Insulation enhancement
- Priced per length or per set, and often folded into another group's kit. Ask whether it sits inside the kit price or beside it — it is the group most often quoted both ways in one tender.
- Mechanical and corrosion protection
- Priced by what is protected rather than by the cable — a buried joint, a pole, a pipe weld, an exposed fitting. Here the environment is the specification.
- Identification
- Priced per unit or per metre, and trivial against the rest. It still needs a line: acceptance turns on the text printed on it, which no test report covers.
Kit or component: one scope, two counts
Quote one scope per kit and per part and you get two numbers that cannot be set beside each other. Neither bidder is wrong. One priced a bill of materials, the other an assembly, and the assembly carries items the bill never listed.
The gap shows in the manufacturer's own contents table for a single medium-voltage transition joint kit: twenty numbered lines, each with its own quantity, and one line quantified differently for the 15 to 24 kV variant than for the 36 kV variant of the same kit. Priced per part, the count moves with the voltage class. Priced per kit, it does not.
So fix the count basis in the enquiry, not in the clarification round. One kit means one complete assembly for one joint or one cable end, consumables and instruction sheet included. A bidder who cannot quote that way will say so, and that is worth knowing early.
Three wordings to check your own scope line against
Supply of cable jointing kits as required- No voltage class, no construction, no number. Every bidder guesses, and no two guess alike. Replace as required with a quantity and the two ranges that define the item: conductor cross-section and cable outside diameter.
Cable accessories for 33 kV XLPE cable — 50 nos.- Fifty of what? Kits, parts, or cable ends. This wording produces most of the spread above. Put the unit inside the quantity, not in an annexure the estimator will not open.
…or equivalent, conforming to the relevant standard- Relevant leaves the accessory standard unnamed. Or equivalent with no equivalence test lets a bidder substitute against a document you have never read. Name the standard, name the edition, and say what evidence proves equivalence.
Which groups one plant plausibly makes, and which it does not
The six groups do not come off one production process. Four of them — jointing, terminating, sealing and end capping, and insulation enhancement — are polymer work: compounding, extrusion, moulding, cross-linking. One plant built for that covers all four. Gala Thermo Shrink Pvt. Ltd., the manufacturer this reference is operated with, states that every process from compounding through to dispatch is in-house, at a published capacity of 30 million moulded parts and 9 million metres of tubing a year.
The metallic and consumable lines inside a jointing or termination kit are a different trade: pressed and machined metal, braid, clamps, sealants, solder. Some are manufactured; some are bought to a specification and packed.
That distinction is your recourse when a batch fails. Where the failed line was made in the plant you audited, one supplier answers and the investigation runs through its own process and test records. Where it was bought in, the answer rests on incoming inspection and on a sub-supplier you never approved. Settle it in the vendor file before award.
Not published — ask for it in writing
The published literature does not set out which lines inside a kit are made in the supplier's own plant and which are bought in. Ask for the contents list with every line marked made or bought, and for the incoming-inspection procedure covering the bought lines. On letterhead, dated, before the order goes out.
What this page deliberately leaves out
No component descriptions, no dimensions, no part codes, no selection table. That is a decision, not an omission. Sizes, shrink ratios and kit codes live on the manufacturer's datasheets, dated and revision-controlled; copying them here would create a second version that quietly drifts. This page's job ends at the line you write on the order.
Where this goes next
Two chains run from here and nowhere else. The first if you are drafting the specification, the second if you are drafting the enquiry.
- Indian and IEC standards for cable accessoriesWhich document governs the accessory rather than the cable, and why the edition date belongs in the clause. Head of the evidence chain.
- How to write an RFQ that gets answered in one roundThe fields, the count basis, and the documents to demand in the enquiry rather than after award. Head of the transaction chain.
Turn the category into an answerable enquiry
You have the boundary, the six groups and the count basis. The next page turns them into the fields a supplier needs before it can quote without a follow-up round.