Cable and Wire Inspection in India

How cables and wires are made

Copper or aluminium rod is drawn down to fine wire, annealed, and bunched or stranded into a conductor. The conductor passes through an extruder that applies PVC, XLPE, rubber or a halogen-free compound as insulation. A spark tester sits on the line after the extruder and applies a high voltage to the surface: any pinhole or thin spot sparks and the fault is logged or cut out. Cores are then laid up together, fillers and armour added for power cable, and an outer sheath extruded. XLPE is cured after extrusion. Finished lengths are wound into coils or onto drums, high-voltage tested, printed and packed.

Two things drive cost: the weight of metal in the conductor and the weight of compound around it. Both are also where shortcuts appear. India exported US$2,871.3 million under HS 8544 in FY2025-26 according to Department of Commerce TradeStat; the figure is provisional, and the heading includes winding wire, wiring harnesses and optical fibre cable as well as power and building cable. We have not found an official source naming cable clusters, so we name no town.

What we check on cables and wires

Check	How it is checked	What fails
Conductor resistance	Factory measures a sample length from a coil we pick on its resistance bridge; reading corrected to 20 °C and compared with the IEC 60228 maximum for the size and class	Resistance above the maximum: the conductor is undersized or of poorer metal
Conductor material and build	Cut end examined; strand count and strand diameter compared with the class and the datasheet	Copper-clad aluminium supplied as copper; fewer strands than declared
Insulation and sheath thickness	Thin slices cut and measured on the factory's measuring projector or microscope; average and minimum compared with the cable standard	Minimum point below the limit; eccentric insulation
Spark test	Spark tester on the extrusion line seen running; set voltage and fault counter checked, with the tester's calibration record	Tester switched off, set too low or not calibrated
High-voltage test	Finished coils or drums tested in the factory's HV bay, with test voltage and time recorded	Breakdown, or test not done on finished lengths
Length	Sampled coils measured on a metering rewinder or by metre marks; coils weighed against the nominal weight per length	Coil shorter than labelled
Print marking	Standard, size, voltage, cores, maker, year, Euroclass, HAR or BASEC marks and metre marks read along the length	Mark that the certificate does not support; print that rubs off
Core colours and construction	Core colours, number of cores, earth core, armour and fillers checked against the specification	Wrong colour code for the market; earth core missing or undersized

Euroclass, BASEC and UL: what the documents must cover

In the EU, power, control and communication cables installed permanently in buildings are construction products. EN 50575 sets their reaction-to-fire performance and classes them from Aca, the best, to Fca, with extra classes for smoke (s), flaming droplets (d) and acidity (a). The manufacturer issues a Declaration of Performance and marks CE. Under Commission Decision 2011/284/EU, classes Aca, B1ca, B2ca and Cca need a notified certification body that type-tests the cable and audits the factory twice a year; Dca and Eca need a notified laboratory for the initial type test. Regulation (EU) 2024/3110 has applied since 8 January 2026 and replaces Regulation (EU) No 305/2011 in stages; the existing harmonised standards stay in use during the transition.

The inspector does not classify fire performance. We read the classification report and certificate of constancy of performance, check that they name the same cable type, construction and compound, and compare the Euroclass printed on the cable and drum label with the Declaration of Performance. A cable printed Cca-s1,d1,a1 must have a certificate for exactly that construction.

In the UK, BASEC certifies cables against British Standards such as BS 6004 and BS 6724 and audits the factory. In the US and Canada, building wire is listed by a certification body to standards such as UL 44 (thermoset) and UL 83 (thermoplastic). In each case we check the certificate or listing directory for the factory, the cable type and the size range, because a certificate for one factory does not cover cable bought in from another. See UL and ETL listing and UKCA and CE marking.

Common defects in cables and wires

Defect	Why it matters	Class
Conductor resistance above the IEC 60228 maximum	Cable overheats at its rated current	Critical
Copper-clad aluminium sold as copper	Higher resistance, weaker terminations, fraud	Critical
HV breakdown on a finished length	Insulation fault that can reach the user	Critical
Euroclass, HAR, BASEC or UL marking without a matching certificate	Cable cannot lawfully be sold or installed as marked	Critical
Insulation below the minimum thickness	Reduced safety margin; fails type requirements	Major
Coil or drum short of the labelled length	Buyer pays for cable not received	Major
Wrong core colours for the market	Wiring errors on site	Major
Print illegible or rubs off	Cable cannot be identified after installation	Minor
Sheath scuffs, uneven coil winding	Appearance and handling	Minor

RoHS and REACH apply to cable compounds sold in the EU; lead stabilisers in PVC are the usual concern. These need a lab result on the compound or cable, not a visual check. See RoHS and WEEE.

Packing, transit and your purchase order

Building wire travels in shrink-wrapped coils in cartons; power cable on wooden or steel drums. Cable ends should be sealed with caps so water cannot enter the conductor, drums should carry the length, type, gross weight and an arrow for the rolling direction, and drum battens should protect the outer layer. Wooden drums for export need ISPM 15 treatment and marking; see ISPM 15. At loading, drums are chocked so they cannot roll.

Put these in your purchase order:

Cable standard, type, size, number of cores, voltage rating and conductor class.
Conductor metal: plain or tinned copper, or aluminium; copper-clad aluminium not accepted unless stated.
Insulation and sheath compound, colours and Euroclass or approval marks required.
Print legend, metre marking and coil or drum length with tolerance.
Routine tests to witness: conductor resistance, spark test, HV test, and how many lengths.
Certificates to supply: Declaration of Performance and classification documents, BASEC or UL listing, RoHS report.
Packing: coil wrap, carton marks, drum type, end caps and ISPM 15.

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Sources

Frequently asked questions

How do you find out if a cable is undersized?

By its conductor resistance. The factory measures a length we choose, the result is corrected to 20 °C and compared with the IEC 60228 maximum for that size and class. An undersized or impure conductor shows a higher resistance even if the outside diameter looks right.

Can you tell copper-clad aluminium from solid copper on site?

Usually, yes. A cut end shows a silver aluminium core under the copper skin, and the cable weighs less than solid copper cable of the same size. Where doubt remains, a lab can confirm the conductor composition.

Do you test the cable's Euroclass fire performance?

No. Reaction-to-fire classification is done by notified bodies and laboratories. We check that the classification report and certificate cover the cable construction shipped and that the printed Euroclass matches the Declaration of Performance.

How do you check drum length?

We rewind sampled coils on a metering machine or read the metre marks at both ends, and weigh coils against the nominal weight per length. Short length is a common problem with cable, so we check it on every sampled coil or drum.

Is the spark test the same as the high-voltage test?

No. The spark test runs on the production line and finds pinholes in the insulation as it is extruded. The high-voltage test is applied to finished lengths between conductors, or to earth, for a set time. Both are routine tests.

Know before it ships

Tell us the product, the factory's city and your ready date. We confirm the inspector, the notice time and the price before you book.

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Cable and wire inspection in India