Case studies

INDEPENDENT ELECTRICAL CABLE VERIFICATION: ENGINEERING SERVICE PROVIDER

06.23.25
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SectorEngineering / Construction
ServiceElectrical Technical Services
DurationOne Month

An engineering service provider

is a firm or organisation awarded a contract to deliver technical expertise, including design, construction, consultation, and maintenance. These providers, offer specialised, multidisciplinary solutions for sectors like water, energy, and transport infrastructure.

  • Sub station

    1 DNO

    (Distribution Network Operator) sub-station

  • Cable

    2 different

    Cable sizes to compare

  • Installation

    39 meters

    Cable length (per leg)

CLIENT CHALLENGE

An engineering service provider faced a critical challenge in their commercial development project in the East of England. The company and their appointed Independent Connections Provider (ICP) had calculated different sizes for the sub-main cable from the DNO sub-station to the LV panel. With cable costs varying significantly based on specification, this discrepancy had substantial financial implications alongside potential risks to the project's safety, compliance, and efficiency. 

The engineering service provider needed an independent, expert verification of the electrical design to resolve this issue and ensure the correct cable size was used.

A key component of this installation was the LV sub-main cable from the DNO sub-station to the LV panel, spanning 39 meters per leg. The cable was to be installed using underground ducting externally and cable ladder internally.

The challenge arose when when the two parties calculated different sizes for the critical cable. This discrepancy created uncertainty and potential risks:

  • Safety concerns: If an undersized cable was used.
  • Unnecessary costs: If an oversized cable was specified.
  • Potential delays: In project timeline due to the unresolved issue.
  • Compliance risks: With relevant electrical standards and regulations. The client needed a trusted, independent expert to resolve this discrepancy and provide a definitive answer on the correct cable size.
Key project DELIVERABLES: 
  • The solution had to be based on rigorous analysis and comply with all relevant standards, particularly BS 7671: Requirements for Electrical Installations - IET Wiring Regulations.

OUR SOLUTION

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BENEFITS

Expert Verification:
  • Bureau Veritas provided an independent, expert verification of the cable design, resolving the discrepancy.
Risk Mitigation:
  • The thorough analysis and clear recommendation mitigated potential safety, compliance, and financial risks associated with incorrect cable sizing.
Compliance Assurance:
  • The verification process ensured compliance with BS 7671 and other relevant standards, providing peace of mind to the engineering service provider and their client.
Cost Optimisation:
  • By determining the minimum compliant cable size, Bureau Veritas helped avoid potential over-specification and unnecessary costs.
George
White MIET

Senior Consultant (Electrical)

Bureau Veritas UK

When there was uncertainty about the appropriate cable specification, we provided an independent assessment to determine the optimal solution. Our analysis ensured the project could proceed confidently with the right design—meeting safety standards while avoiding unnecessary costs.

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