ElectricalInspection & Testing Plan (ITP) Hold & Witness Included PDF / Word / Excel
Medium and High Voltage Cable Pulling and Termination ITP Template
A Medium & High Voltage Cable Pulling ITP defines the quality verification checkpoints for handling, pulling, laying, and terminating 11kV, 33kV, 110kV, and 132kV XLPE power cables through underground duct banks, trenches, and substation cable trays. Compliant with IEEE 576, IEC 60502, and IEC 60840, this ITP guarantees that maximum pulling tensions, minimum bending radii, duct mandrel rodding, insulation resistance (Megger), and VLF/AC Hi-Pot commissioning tests meet strict utility standards.
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Cables laid in trefoil or flat formation with specified spacing; 150mm stone-free sand bedding; warning tape placed
Electrical QC Inspector
7.0
Post-Pulling Test
Post-Pulling Outer Sheath DC Voltage Test (10kV DC for 1 Minute)
HHW
IEC 60229
10kV DC applied between metallic screen and ground for 1 min; zero puncture breakdown of HDPE outer sheath
Testing & Commissioning Engineer
8.0
Termination & Test
Cold-Shrink / Heat-Shrink Termination & Very Low Frequency (VLF) Hi-Pot
HHH
IEEE 400.2 / IEC 60502
Certified jointer stamps; VLF 0.1Hz test voltage (3Uo) applied for 15-60 mins with zero insulation breakdown
Certified Jointer & T&C Lead
Role Key:HHold Point: Mandatory sign-off requiredWWitness Point: Formal notification (inspect if present)RReview: Certificate / Submittal checkSSurveillance: Continuous audit check
Applicable Standards & Codes
IEC 60502-2: Power Cables with Extruded Insulation for Rated Voltages from 6 kV up to 30 kV
IEEE 576: Recommended Practice for Installation, Termination, and Testing of Insulated Power Cable
IEEE 400.2: Guide for Field Testing of Shielded Power Cable Systems Using Very Low Frequency (VLF)
IEC 60229: Electric Cables - Tests on Extruded Over-sheaths with Special Protective Function
NETA ATS: Standard for Acceptance Testing Specifications for Electrical Power Equipment
Common Site QA/QC Mistakes
Exceeding the manufacturer maximum pulling tension on the copper conductor, stretching internal XLPE insulation.
Bending the cable past the permissible minimum bending radius (e.g. < 15x OD), causing microscopic internal insulation stress cracks.
Using petroleum-based grease instead of certified water-soluble cable pulling lubricant, dissolving the cable jacket.
Neglecting outer sheath DC testing (IEC 60229), leaving undetected rock punctures that invite water treeing and cable failure.
Allowing jointers without valid manufacturer certifications to execute MV/HV terminations and splices.
Technical Frequently Asked Questions
What is the formula for calculating maximum cable pulling tension?
When pulling by the conductor core using pulling eyes, the maximum allowable tension is calculated as T = k x A, where k is 70 N/mm² for copper (50 N/mm² for aluminum) and A is the cross-sectional area of the conductors in mm².
What is the required bending radius for XLPE medium voltage cables?
During installation and pulling, the minimum dynamic bending radius is typically 15 to 20 times the overall cable diameter (OD). For final fixed installation without tension, the radius is typically 12 to 15 times OD.
Why is Very Low Frequency (VLF) AC testing preferred over DC Hi-Pot for XLPE cables?
IEEE 400.2 warns that high DC voltage testing creates destructive space charges in solid dielectric XLPE cables that prematurely degrade the insulation and cause rapid breakdown upon energization. VLF (0.1Hz AC) stresses the cable naturally without trapping space charges.
