Technical insight
Testing is where installation quality meets proof. This article explains the practical differences between VLF and DC testing in simple terms, and how testing fits into a clean energisation handover.
For project delivery support, see HV Testing and Commissioning.
VLF testing is widely used for polymeric cable systems because it provides a practical way to apply a high voltage stress test on longer circuits using manageable equipment.
The key point for project teams is that VLF testing is typically chosen to suit the cable type, length, and the network owner requirements. Testing should be planned early so access, outages and readiness checks are aligned.
DC testing is sometimes referenced historically and in specific contexts, but test selection should always match the cable system and the network owner requirements. The wrong test choice can create disputes, delays, or unnecessary risk.
If testing is being specified, confirm the required method and acceptance criteria early in the programme.
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