A training record evidences attendance. A competence record evidences that the person has been assessed and authorised for the specific tasks they perform, and it is the record that a client, an insurer or a regulator will ask to see.

Why HV testing competence is a safety issue

The hazards in high-voltage testing are not only the ones that exist in normal operation. A test set can apply a voltage to a piece of equipment that is not connected to the network, in a location that is not usually live, at a moment when other work is in progress nearby.

The additional hazards are stored energy, induced voltage and the possibility of a test failure that projects material. Each of them has to be understood by the person performing the test rather than only by the person who planned it.

The consequence is that competence has to be specific. A person who is competent to perform a routine insulation resistance measurement on a distribution asset is not thereby competent to conduct a resonant withstand test on a transmission cable, even though both involve applying a voltage.

Competence levels and task mapping

The mapping should be to tasks rather than to job titles. The same title may cover a different task set in a different team, and a competence record that states a job title without stating the tasks does not establish anything.

The task list should be specific enough to be assessed: the test method, the equipment, the voltage class and the asset type. A competent person for one combination is not automatically competent for another.

Training content for methods versus equipment

Method training covers the standard, the purpose of the test, the conditions under which it applies, the acceptance criteria and the limitations. A technician who can perform a withstand test but cannot explain when that method is appropriate will eventually apply it inappropriately.

Equipment training covers the controls, the configuration, the calibration and verification requirements, the safety features and the failure modes. It is specific to the instrument and has to be repeated when the instrument changes.

Safety training covers the specific procedures the team works under: isolation and earthing practice, the boundaries around a test, the discharge procedure and the response to a failure during a test. That content is site-specific and should be delivered against the team’s own procedures rather than generically.

Assessment and authorisation records

Assessment should be practical as well as theoretical. A person’s competence to perform a test is established by observing them perform it, not by a written examination alone.

The assessment record should state the task, the assessor, the date, the method of assessment and the outcome. Where the assessment was performed under supervision over a period, the record should state the period and the number of tests performed.

The authorisation record should state the tasks the person is authorised for, the date from which the authorisation applies and, where applicable, the date on which it lapses. An authorisation without a scope is not a control.

The two records are related but distinct. A person may be assessed as competent and not authorised for a particular task on a particular site, for instance where the site-specific induction has not been completed.

The instrument records that support the same evidence set carry their own traceability requirements, described in the NIST handbooks and by the accreditation bodies such as ILAC.

Refresher intervals and method changes

A fixed refresher interval is a baseline rather than a control. Reassessment is justified when the person has not performed the task for a defined period, when the method or the standard has changed, when the equipment has changed, and after any incident or near miss.

The interval should be set from the risk and the frequency of the task. A task performed weekly keeps its competence current through practice; one performed annually needs a reassessment before the next occasion rather than after it.

Method changes deserve specific attention. When a standard is revised, the acceptance criteria or the test level may change, and the team’s competence in the previous edition does not transfer automatically. The revision should trigger a briefing and, where the change is significant, a reassessment.

Supervision requirements for junior staff

Supervision is a defined relationship rather than a general presence. The supervisor has to be able to stop the work, to authorise the energisation and to take over the task if necessary, and their own competence has to cover the tasks being supervised.

The ratio of experienced to inexperienced staff deserves attention on a test that requires coordination. A withstand test involves several people performing distinct tasks, and the supervisor’s ability to observe all of them at once is a practical limit rather than a procedural one.

Where a junior member of staff is developing a competence, the arrangement should state what they may do, what requires the supervisor’s direct involvement and what they may not do at all. That statement is what makes the supervision a control rather than a formality.

Documentation a client or regulator may request

The competence matrix is the primary document: people on one axis, tasks on the other, with the competence level and the authorisation date in each cell. It answers the question of who is authorised for what without reference to individual files.

The supporting records are the assessment records, the authorisation records, the training records including refresher training, and the site-specific inductions. Where the work is performed under a safety management system, the incident and near-miss records are also relevant, because they show whether the competence system is reacting to events.

Where the governing standard requires the measurement to be performed with traceable equipment, the instrument records form part of the same evidence set. The measurement system requirements that govern high-voltage measuring equipment are set out in IEC 60060-2, the safety framework for work on electrical installations is described by the regulator guidance published by the UK Health and Safety Executive and, for the United States, by the electrical safety requirements published in the eCFR, and utility practice with test teams is coordinated through CIGRE study committees. Support and training arrangements for equipment are described under testing services and OEM/ODM solutions.

Building a competence matrix

The matrix should be built from the task list rather than from the personnel list. Start with the tests the team performs, group them by method and asset class, and define the competence level each requires.

Then map the people onto the tasks, recording the level and the authorisation date. The gaps that appear are the training requirements for the next period, which makes the matrix a planning document as well as a record.

Finally, the matrix should be reviewed on a defined cycle and whenever the task list changes. A new test method or a new equipment type adds rows, and a person leaving removes a column. Both events change what the team is able to do, and both should be visible before the work is committed rather than during it.