Data Cabling
QA inspection checklist

Installation

1. 1.

   Cable type and category match specification (Cat5e/6/6a/fibre)
   What to look forCable jacket marking shows category (Cat5e, Cat6, Cat6a, Cat7, Cat8) and standard (BS EN 50173 / TIA-568). Fibre type marked (OS1, OS2, OM3, OM4, OM5). LSZH (Low Smoke Zero Halogen) sheath in escape routes. Manufacturer drum / box label retained.
   Acceptable whenPer BS EN 50173-1:2018: cable category supports Class D (Cat5e, 100 MHz) / E (Cat6, 250 MHz) / EA (Cat6a, 500 MHz) / F (Cat7, 600 MHz) / II (Cat8). Fibre OS2 single-mode, OM3/4 multimode 50 µm. LSZH per BS EN 60332-1 in escape routes.
   StandardBS EN 50173-1:2018 — Generic cabling systems. TIA-568.0/1/2/3-D. BS EN 60332-1 (fire performance).
   Common defectsCat5e supplied where Cat6 specified — bandwidth limitStandard PVC sheath in escape route — should be LSZHOM1 fibre supplied where OM3 specified — old generationNo category mark on jacket — cannot verifyMixed manufacturers — warranty issues
2. 2.

   Cable routes match design drawings
   What to look forCable routed via specified containment (basket, tray, conduit). Routes cross-checked against design layouts. No "rats nest" of unsupported cable. Cable runs straight, supported at intervals.
   Acceptable whenPer BS EN 50174-2:2018 / TIA-568: containment per design; cable supported at intervals ≤ 1 m horizontal, ≤ 1.5 m vertical. Cables segregated from power per BS EN 50174.
   StandardBS EN 50174-2:2018 — Information technology cable installation. TIA-568.
   Common defectsCable laid on ceiling tiles — collapse risk, damage on tile liftUnsupported runs sag — stress on terminationsCable through suspended ceiling without tray — damage in serviceRoutes off design — extra length, signal margin lostPenetrations not sleeved
3. 3.

   Bend radius maintained — no kinks or tight bends
   What to look forCable bend radius respected at every change of direction — no sharp 90° bends, no kinks from over-pulled. Tray bends radiused. Pulled tension within manufacturer limit (typically ≤ 110 N).
   Acceptable whenPer BS EN 50173 / manufacturer: minimum bend radius 4× cable diameter (UTP) / 8× during pull; 10× for fibre installed, 20× during pull. Tension ≤ 110 N (UTP) / per cable spec for fibre.
   StandardBS EN 50174-2:2018. Manufacturer technical data.
   Common defectsKink — internal damage to twisted pairsTight bend at 90° corner — bandwidth degradationOver-pulled — sheath stretchedFibre kinked — high attenuationBend radius < manufacturer spec
4. 4.

   Cable ties not overtight — no compression of conductors
   What to look forCable ties (or hook & loop straps in best practice) not over-tight — no visible deformation of cable jacket. Hook & loop preferred over plastic ties for data cables. Bundles tidy but not crushed.
   Acceptable whenPer BS EN 50174-2 / TIA-568: hook & loop straps preferred. Plastic ties acceptable if hand-tightened only. No deformation > 1 mm. Spacing 200-300 mm in horizontal runs.
   StandardBS EN 50174-2:2018. TIA-568.
   Common defectsPlastic ties pulled tight by gun — cable deformedOver-bundled — return loss highTies through cable bundle pinching someHook & loop preferred but not usedExcessive cable count in single bundle (> 50 typical max)
5. 5.

   Separation from power cables maintained
   What to look forData cables separated from power cables per BS EN 50174-2 — typical 200 mm in air, 50 mm with metal divider. Crossings at 90° only. No parallel runs in same trunking without barrier.
   Acceptable whenPer BS EN 50174-2 Annex A: separation depends on installation environment and EMI risk: typically 200 mm air for unscreened LV / unscreened data; reduced with metal containment / screened cable.
   StandardBS EN 50174-2:2018 Annex A. BS 7671 Section 528 (segregation).
   Common defectsParallel run with power < 200 mm — EMI degrades dataNo barrier in shared trunkingCrossing at acute angle — induced interferencePower and data on common cable trayScreen connectivity broken at terminations
6. 6.

   Fire stopping at all penetrations
   What to look forEvery penetration through fire-rated wall / floor sealed with intumescent sealant, fire pillows, or fire collar matching wall rating. Cable bundle filled per system tested configuration. Labels on either side of penetration.
   Acceptable whenPer BS 9999 / Approved Document B / BS EN 1366-3: fire stopping rating to match wall (typically 60-120 min). System tested per BS EN 1366-3 and matched on site (configuration must replicate test).
   StandardBS EN 1366-3:2009 — Fire resistance tests for service penetrations. ASFP "Blue Book". BS 9999:2017. Approved Document B.
   Common defectsPenetration unsealed — fire passes through compartmentAd-hoc sealing with non-approved foamCable bundle change post-installation without re-firestoppingNo label — future works unawareTested configuration not matched on site

Termination & Patching

1. 7.

   Patch panels labelled and tidy
   What to look forPatch panels installed in cabinets per layout. Cable management arms used. Labels permanent (laser-printed or engraved) per port — matches floor outlet number. Sufficient cable slack (no strain). No "patch jungle".
   Acceptable whenPer BS EN 50174-1: patch panels permanently labelled per outlet. Cable management arms / horizontal management bars at every patch panel. Slack 300-500 mm at panel for re-termination.
   StandardBS EN 50174-1:2018. TIA-568.
   Common defectsHand-written labels fading — port identification lostNo cable management — patch cables drapeInsufficient slack — re-termination requires new cableLabels not matching outlet number"Patch jungle" — extra cables across face of cabinet
2. 8.

   Outlets installed at correct positions and heights
   What to look forOutlets at design positions (typically 450 mm AFFL low-level, 1100 mm desk height, ceiling for WiFi). Plumb and aligned with adjacent outlets (e.g. matching power socket height). Faceplate flush, no gaps.
   Acceptable whenPer BS EN 50173-2 / Approved Document M: 450 mm AFFL minimum standard for general; 1000-1200 mm for accessible reach range. Outlet plumb ±2 mm.
   StandardBS EN 50173-2:2018. Approved Document M.
   Common defectsOutlet at random height — non-coordinated with deskOutlet behind built-in furnitureFaceplate not flush — gap to wallOutlet on wrong side of roomBelow 450 mm AFFL — accessibility issue
3. 9.

   Terminations to TIA/EIA 568 standard
   What to look forTerminations made to T568A or T568B colour scheme — consistent throughout installation. Untwist length ≤ 13 mm at termination. Sheath stripped to no more than the manufacturer's specification. No conductor damage from stripper.
   Acceptable whenPer ANSI/TIA-568.2-D / BS EN 50173: T568A or T568B (project decision; mixed not allowed). Untwist ≤ 13 mm Cat6, ≤ 8 mm Cat6A. Punch tool calibrated.
   StandardANSI/TIA-568.2-D. BS EN 50173-1:2018.
   Common defectsT568A and T568B mixed — link does not workExcessive untwist — NEXT failsConductor scored by stripper — link fails high frequencyPunch tool blade dull — poor terminationSheath stripped > 25 mm — pairs unsupported
4. 10.

   All cables labelled at both ends
   What to look forEvery cable labelled at outlet end and patch panel end with matching ID. Labels permanent (heat-shrink or self-laminating). Numbering scheme consistent and matches as-built drawings. No unlabelled cables.
   Acceptable whenPer BS EN 50174-1 / TIA-606-B: every cable identified at both ends; labels permanent and durable. Identification matches floor plan, room number, and patch panel position.
   StandardANSI/TIA-606-B. BS EN 50174-1:2018.
   Common defectsHand-written / paper labels fadeOnly one end labelledNumbering inconsistent — confusionLabels do not match drawingsCable not labelled at all

Testing

1. 11.

   Fluke/certification test passed on all links
   What to look forEvery link certified with Fluke DSX-8000 / similar tester. Test report stored and reviewed. PASS at appropriate Class (Class D/E/EA per cable category). Marginal results investigated and re-terminated.
   Acceptable whenPer BS EN 50173 / TIA-568.2 permanent link certification: PASS at all measured parameters (insertion loss, NEXT, return loss, ACR-F, etc.) within Class limits. Tester calibrated within last 12 months.
   StandardBS EN 50173-1:2018. TIA-568.2-D. ISO/IEC 11801.
   Common defectsMarginal / fail link not retested after re-terminationTester adapter mismatched — invalid resultCalibration out of datePermanent link config not matched (channel test instead)Tests not stored — disputes during warranty
2. 12.

   Test results meet Cat rating specification

   Record: Link length (m)
   What to look forInsertion loss within limit, NEXT margins healthy, return loss within limits, length ≤ 90 m permanent link (100 m channel). Each parameter shown with PASS margin in dB. Worst-case parameter highlighted.
   Acceptable whenPer BS EN 50173-1: permanent link length ≤ 90 m + 10 m patch cords = 100 m channel max. Insertion loss / NEXT / Return Loss / ACR-F / Delay Skew per Class limits. Margin > 0 dB worst-case.
   StandardBS EN 50173-1:2018. TIA-568.2-D.
   Common defectsLength > 90 m permanent — fails standardNEXT marginal in worst pair — link unreliable at high speedReturn loss fail in low-frequency band — termination defectPASS by < 1 dB — no margin for ageing / heatSome links not measured
3. 13.

   NEXT/return loss within limits
   What to look forNEXT (near-end crosstalk) and Return Loss reviewed on each link. Margins healthy across frequency band. No "double bumps" indicating poor termination. PowerSum NEXT also reviewed for high-frequency Cat 6A+.
   Acceptable whenPer BS EN 50173 Class limits: Cat6 NEXT ≥ 41.8 dB at 250 MHz worst pair; Cat6A NEXT ≥ 39.3 dB at 500 MHz. Return Loss ≥ 19.1 dB Cat6, ≥ 17.3 dB Cat6A. PowerSum NEXT for parallel pairs.
   StandardBS EN 50173-1:2018. TIA-568.2-D.
   Common defectsNEXT marginal — re-termination neededReturn loss double bump — internal cable damagePowerSum NEXT failure — bundle compressionUntwist excessive at terminationWrong category jack used (Cat5e jack on Cat6 cable)
4. 14.

   Fibre OTDR test passed (if fibre)
   What to look forFibre links tested with OTDR (Optical Time Domain Reflectometer) from both ends. Loss budget within design. No high-loss splices or connectors. Bidirectional average loss reported. Tester wavelength matches fibre type (1310/1550 single-mode; 850/1300 multimode).
   Acceptable whenPer BS EN 50173-1 / IEC 14763-3: OTDR bidirectional average loss within link budget; connector loss ≤ 0.5 dB; splice loss ≤ 0.3 dB. Tested at appropriate wavelengths.
   StandardBS EN 50173-1:2018. IEC 14763-3:2014. TIA-568.3-D.
   Common defectsHigh-loss connector — dirty / damagedSplice loss too high — re-spliceOTDR launch / receive fibres not used — first / last connector unmeasuredWrong wavelength usedTest from one end only — bidirectional missing
5. 15.

   Certificate of conformance provided
   What to look forCertificate of Conformance covering installation method, test results, manufacturer warranty. Issued by manufacturer-approved installer. Includes link-by-link results database. Signed by competent person.
   Acceptable whenPer BS EN 50173-1 / manufacturer warranty (typically 25 years on system): installer holds approved status; CoC certifies materials, workmanship, and test results. Records in O&M.
   StandardManufacturer warranty schemes (Panduit, Excel, Brand-Rex). BS EN 50173. ISO/IEC 11801.
   Common defectsNo CoC — warranty voidInstaller not manufacturer-approvedTest results not appendedSignature illegible / no nameWrong warranty period claimed

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