XWA Power & Cable issues procurement guidance for EPC cable buyers

XWA Power & Cable has published five-part technical guidance for international EPC cable procurement, aimed at reducing specification errors, failed tests and delivery delays. The advice focuses on cable construction, screening and armour choices, water blocking, testing, documentation and installation support.

Why it matters: - EPC cable purchases can fail after award if specifications, standards and test records do not match the ordered design. - XWA Power & Cable says unresolved technical gaps can lead to rejected deliveries, delayed commissioning, storage charges, rework and contract disputes. - The guidance is aimed at buyers trying to compare technically equivalent offers, not just the lowest initial price.

What happened: - XWA Power & Cable published five-part technical procurement guidance for international EPC projects. - The guidance covers medium- and high-voltage cable quotations, plus low-voltage, control and overhead conductor packages. - The release is based on the company’s 17 years of overseas cable supply experience across power distribution, substations, mining, industrial facilities and transmission infrastructure. - XWA framed the guidance for international EPC engineering and purchasing teams, as well as contractors handling cable procurement.

The details: - The first guidance area warns that abbreviated cable codes and local terminology often leave out key construction details. - A notation such as “AL/XLPE/AWA/PVC 3 × 185 mm² 11kV” may not fully define screens, bedding, water-blocking or accessories. - XWA says buyers should complete a layer-by-layer construction review covering conductor, semiconductive screens, insulation, metallic screening, inner coverings, armour, outer sheath and any moisture protection. - The review should also document which tender, drawing or purchase-order document controls when descriptions conflict. - The second guidance area focuses on screening, armour and governing standards. - Copper tape screen and copper wire screen are not electrically or mechanically interchangeable. - In XWA’s comparisons, switching between specified copper tape and copper wire screening changed screening costs by more than 10% and altered short-circuit performance calculations by 30% to 50% in the cases reviewed. - For single-core AC cables, magnetic steel armour can add circulating-current or eddy-current losses and reduce current-carrying capacity. - XWA reports reductions of about 15% to 25% in the scenarios it assessed, depending on the design and installation assumptions. - The guidance says IEC designations should not be treated as interchangeable with local standards just because the product names look similar. - The third area addresses water blocking, site conditions and product identity. - XWA cites CIGRE findings that water-treeing-related insulation breakdown accounted for more than 60% of reported operating failures in the examined 110kV-and-above cable population. - The guidance recommends confirming longitudinal or radial water-blocking requirements, sheath and metallic barrier arrangements, and installation exposure before approving a design. - Site conditions such as temperature, moisture, corrosion, laying method, short-circuit duty and route geometry should shape the specification. - Local names such as “TT wire,” “twisted pair” and “CCS stranded conductor” can cause quotation errors if their meanings are not confirmed in writing. - CCS means copper-clad steel and should not be priced as pure copper. - The fourth area covers testing and documentation. - Qualification and acceptance may require AC withstand tests, partial-discharge measurements, lightning-impulse tests and material or construction checks, depending on voltage class. - Test records must match the actual cable system submitted for approval. - XWA says it coordinates higher-voltage production and verification through qualified partners, including a specialist testing base with capability up to the 500kV class. - The company says coordinated testing can begin within 48 hours after production completes under qualifying arrangements. - Applicable references include IEC 60502-2, IEC 60840 and IEC 62067, depending on voltage class and project scope. - Approved drawings, construction records, test reports, drum IDs, inspection results, packing lists and shipment documents should all align. - The fifth area extends technical control into delivery and installation. - The guidance applies to cable packages that may include medium-voltage and high-voltage power cables, low-voltage and control circuits, special industrial cables, grounding products and overhead aluminum conductors. - After dispatch, risks shift to handling and installation issues such as bending radius, pulling tension, sheath damage, joint sealing, screen bonding, cable layout and accessory compatibility. - XWA says a Mongolian mining case it reviewed involved excessive heating and sheath deterioration within three months after an unsuitable steel-tape armour arrangement was used on a single-core high-voltage cable. - The company says it provides handling and installation guidance and targets written technical clarification within 24 hours. - XWA also says engineers can review drawings and photographs remotely to help resolve bonding, pulling, bending and accessory questions.

Between the lines: - The guidance is a procurement document, but it also functions as a risk-management checklist for overseas cable supply. - XWA is pushing buyers to resolve engineering questions before production begins, when changes are cheaper and less disruptive. - The emphasis on documentation suggests many failures happen at the handoff between quotation, manufacturing, shipping and site installation. - The examples point to a common theme: apparently small substitutions can create large technical and commercial differences.

What's next: - XWA says the guidance is intended for EPC purchasers, utilities, distributors and industrial project teams preparing technical schedules or reviewing supplier quotations. - The company is positioning technical clarification, documentation control and coordinated testing as part of the procurement process. - Buyers using the guidance are expected to verify designs earlier, tighten acceptance requirements and clarify installation obligations before orders move forward.

The bottom line: - XWA’s message is simple: cable procurement is only economical when the specification, construction, testing and installation plan all match from the start.