CN→ZA Cable Bend Radius Maintenance & Process Guide
Slug: /guides/cn-za-cable-bend-radius-r14/ · TradVolt · Maintenance & process sequence · Indicative costing only
Verdict — 1 compliance rule: Bend radius must be ≥ N × OD, where N is the multiplier stated on the cable OEM datasheet for the exact part number installed and OD is the cable outer diameter printed in that datasheet. Working reference for two real, publicly marketed single-core PV DC cables: Lapp Ölflex Solar XLR-R 1×6 mm² (fixed install = 4×OD, dynamic = 5×OD, per the manufacturer product family page) and Prysmian Prysun 2.0 PV1-F (fixed install = 4×OD, dynamic = 5×OD, per the manufacturer product family page). A measured radius below N×OD is a non-conformance and is flagged in Step 3. Sign-off: QA Lead with Install Supervisor countersign (Step 5). Equipment: PV DC string cable on CN→ZA solar PV export corridor. Horizon: installation + periodic re-inspection (Steps 1–8). Evidence date: 2024–2025 OEM product family pages (see §9 claim rows). Limitation: indicative costing only; HS/duty rows are PENDING live SARS and China Customs lookup; any slot without a named source is flagged UNCERTAIN or treated as a model assumption.
Decision rule
Equipment / cable family
Horizon
Evidence date
Limitation
Bend radius ≥ N×OD per OEM datasheet
PV DC string cable — Lapp Ölflex Solar XLR-R 1×6 mm²; Prysmian Prysun 2.0 PV1-F
2024–2025 OEM product family pages (see §9 claim rows)
Indicative costing only; HS/duty rows PENDING live SARS & China Customs lookup; values without a named source flagged UNCERTAIN / model assumption
Editorial notice: This guide is a maintenance/process sequence for cable bend radius compliance on the China → South Africa green-tech export corridor. All cost slots are labelled INDICATIVE. Duty rates are marked PENDING pending live SARS and China Customs lookup. No OEM, certification body, regulator or customs value has been invented; figures shown without a named source are flagged UNCERTAIN or treated as model assumptions. Bend-radius multipliers cited here are taken from the cable manufacturer's published product family page; treat as a model assumption pending confirmation against the printed datasheet shipped with the reel at goods-in.
This guide sequences the maintenance and verification activities required to keep cable bend radius within OEM-stated minimums along a China (CN) → South Africa (ZA) solar PV export corridor. It is intended for use by EPC subcontractors, QA inspectors and O&M leads during installation, commissioning and the periodic re-inspection cycle. Bend radius values referenced are multipliers of cable outer diameter (OD) as published by the cable OEM on the relevant product family page and product datasheet — for the Lapp Ölflex Solar XLR-R 1×6 mm² and the Prysmian Prysun 2.0 PV1-F (see §9 claim rows). Where a project specifies a stricter corridor value (for example to satisfy an EPC employer's specification), that stricter value governs and supersedes the OEM datasheet floor.
2. Step-by-Step Maintenance & Process Sequence
Step #
Action
Owner
Input Doc
Output Doc
Done-when
1
Confirm cable family and datasheet bend radius (record OEM part number + datasheet revision ID)
Multiplier (e.g., 4×OD fixed, 5×OD dynamic) recorded per cable type from OEM product page; printed datasheet (shipped on reel) cross-checked at goods-in
2
Record route profile and OD measurements (OD value taken from the OEM datasheet for the installed part number)
Site Engineer
Route survey, OD measurement log
Route profile sheet
OD, route class (tray/conduit/burial/riser) and ambient range logged per segment
3
Compute minimum bend radius per segment (minimum = N×OD per OEM datasheet)
QA Lead
Reference sheet + route profile
Compliance calculation sheet
Minimum bend radius calculated; any segment where measured radius < N×OD flagged as non-conformance
4
Inspect pull points and support spacing
Install Supervisor
Pull-point inspection checklist
Pull-point report
Sheave, roller, cleat and support spacing verified against OEM guidance
5
Apply installation record and sign-off (QA Lead sign-off; Install Supervisor countersign)
QA Lead
Compliance sheet + photos
As-built bend-radius record
As-built marked, photographic evidence attached, installer signed
6
Schedule periodic re-inspection cadence
O&M Lead
OEM warranty, site environment
Re-inspection schedule
Interval set; thermal-cycling segments flagged for shorter interval
7
Compile documentation pack for handover
Project Engineer
Steps 1–6 outputs
Maintenance dossier
Dossier reviewed against document checklist (see §3) and lodged
8
Archive dossier and notify TradVolt / employer
Document Controller
Maintenance dossier
Archive index entry
Index entry created, retention period set, stakeholders notified
3. Document Checklist
The following literal filenames are expected in the maintenance dossier. Filenames must match exactly for downstream QA tooling. A printable checklist containing this list is available above as Download Checklist (PDF).
CNZA-R14-DS-OEM-cable-datasheet.pdf — OEM datasheet PDF for the exact part number installed (for the Lapp Ölflex Solar XLR-R 1×6 mm² or the Prysmian Prysun 2.0 PV1-F as supplied on the reel)
CNZA-R14-REF-bend-radius-reference-sheet.xlsx
CNZA-R14-RTE-route-profile-sheet.pdf
CNZA-R14-CALC-compliance-calculation-sheet.xlsx
CNZA-R14-PUL-pull-point-report.pdf
CNZA-R14-ASB-as-built-bend-radius-record.dwg
CNZA-R14-PHT-photo-evidence-folder.zip
CNZA-R14-SCH-re-inspection-schedule.xlsx
CNZA-R14-DOS-maintenance-dossier.pdf
CNZA-R14-IDX-archive-index-entry.csv
4. Timeline (Indicative)
Phase
Activity
Indicative duration
Day 1
Steps 1–2: datasheet pull, route survey
1 working day
Day 2–3
Steps 3–4: calculations and pull-point inspection
2 working days
Day 4
Step 5: as-built sign-off
1 working day
Day 5–7
Step 6: schedule and stakeholder review
3 working days
Day 8–10
Steps 7–8: dossier compilation and archive
3 working days
Total indicative cycle: ~10 working days from datasheet pull to archived dossier, excluding any non-conformance rework loops. Durations are INDICATIVE pending project scale.
5. Indicative Cost Table
All slots below are labelled INDICATIVE. TradVolt does not publish hard prices on guides; final figures are issued against an RFQ response.
Cost slot
Description
Value (USD)
Status
C-01
QA Lead time, datasheet pull & reference sheet
INDICATIVE
UNCERTAIN — not OEM-published
C-02
Site Engineer route survey & OD log
INDICATIVE
UNCERTAIN — not OEM-published
C-03
Compliance calculation effort
INDICATIVE
UNCERTAIN — not OEM-published
C-04
Pull-point / sheave inspection
INDICATIVE
UNCERTAIN — not OEM-published
C-05
As-built record & sign-off
INDICATIVE
UNCERTAIN — not OEM-published
C-06
Periodic re-inspection (per cycle)
INDICATIVE
UNCERTAIN — not OEM-published
C-07
Dossier compilation & archive
INDICATIVE
UNCERTAIN — not OEM-published
6. HS Code & Duty Block (PENDING)
Item
HS code (indicative)
Duty rate
Status
PV DC string cable (PV1-F / H1Z2Z2-K family, e.g., Lapp Ölflex Solar XLR-R, Prysmian Prysun 2.0 PV1-F)
8544.60
PENDING
Awaiting live SARS & China Customs lookup
LV AC power cable (armoured)
8544.42
PENDING
Awaiting live SARS & China Customs lookup
Cable glands / accessories
8547.90
PENDING
Awaiting live SARS & China Customs lookup
Lookup: South African duties to be confirmed against the live SARS tariff query result page for the actual HS subheading at the time of export (SARS — South African Revenue Service); China export-side duties to be confirmed against the GACC Online Customs live result page for the actual HS subheading at the time of export. HS subheading references per the WCO Harmonized System 2022 nomenclature — Chapter 85 (8544.60, 8544.42, 8547.90). Disclaimer: HS classifications above are indicative starting references only and do not constitute a binding tariff ruling. Final classification must be confirmed by a licensed customs practitioner against the actual consignment, including any applicable anti-dumping, safeguard or preference-eligibility overlays (e.g., AGOA, SADC, China–Africa preferential arrangements as in force at the time of export).
7. FAQ
Q1. What is "minimum bend radius" and why does it matter?
It is the smallest radius a cable may be bent around without damaging its conductor, insulation or sheath. Bending tighter than the OEM-stated minimum can degrade insulation, increase sheath stress, accelerate ageing and void warranty. The multiplier (for example 4×OD for fixed installation, 5×OD for dynamic / moving) is set by the cable OEM and published on the product family page and on the printed datasheet shipped on the reel — for the Lapp Ölflex Solar XLR-R 1×6 mm² (4×OD fixed / 5×OD dynamic, model assumption pending confirmation against the printed datasheet) and the Prysmian Prysun 2.0 PV1-F (4×OD fixed / 5×OD dynamic, model assumption pending confirmation against the printed datasheet).
Q2. Is 4×OD a universal rule?
No. 4×OD is a common convention for fixed single-core PV DC cables, but values vary by cable family, insulation compound and installation class. Always use the value printed on the OEM datasheet for the exact part number being installed; if in doubt, contact the manufacturer for written guidance.
Q3. How does the CN→ZA corridor affect bend radius practice?
The corridor introduces long sea-freight reels, repeated handling at ports and variable ambient temperatures on the South African site. None of these alter the OEM minimum, but they do affect inspection cadence: thermal-cycling segments should be re-inspected more frequently than stable indoor trays.
Q4. Who signs off the bend-radius record?
Sign-off belongs to the QA Lead named in Step 5 of the sequence table, with the Install Supervisor countersign. For utility-scale projects an independent employer's engineer may also countersign.
Q5. Can I skip steps if the run is short?
No. The sequence is designed to produce an auditable dossier regardless of run length. Short runs reduce calculation time but not the documentation obligations; skipping steps breaks the chain of evidence and may jeopardise warranty and insurance positions.
Lapp Ölflex Solar XLR-R 1×6 mm² — minimum bend radius 4×OD (fixed installation), 5×OD (dynamic). Manufacturer: Lapp. Treated as model assumption pending confirmation against the printed datasheet shipped on the reel.
Prysmian Prysun 2.0 PV1-F — minimum bend radius 4×OD (fixed) / 5×OD (dynamic). Manufacturer: Prysmian. Treated as model assumption pending confirmation against the printed datasheet shipped on the reel.
HS subheading 8544.60 — "Insulated wire, cable and other electric conductors… other electric conductors, for a voltage exceeding 1,000 V" — starting reference for PV DC string cable.
HS subheading 8544.42 — "Other electric conductors for a voltage not exceeding 1,000 V… with connectors" — starting reference for LV AC armoured cable with fitted connectors.
China export-side duties to be confirmed against the live GACC Online Customs query result page returned for the actual HS subheading at time of export.
http://online.customs.gov.cn/ (General Administration of Customs of the People's Republic of China — Online Customs / GACC)
§6
Bend-radius multipliers (e.g., 4×OD fixed, 5×OD dynamic) are OEM-published on the cable manufacturer's product family page and printed on the datasheet shipped on the reel.