7.2 Supervision Principles: Direct vs General Supervision & Trainee Ratios

Supervision principles

Supervision is the system by which a certifying practitioner ensures restricted work performed by another person is competent, safe, and compliant. It is not satisfied by lending a licence number or reviewing photographs at the end.

Who must be supervised

A person who is not independently authorised at the certifying level must work within the supervision rules for their class, trainee status, or exemption. Confirm the person’s current Board status before assigning restricted work. The supervisor must hold the appropriate trade authority and be able to exercise real control.

The Board’s current guidance gives heightened presence expectations early in training. During a trainee’s first 12 months, work is carried out in the presence of the certifier or a nominated person who is registered or certifying in the same trade. For an exemption holder, the corresponding early period is 24 months. Confirm the current guidance and any licence conditions for the individual.

No universal 1:2 ratio

The Board does not prescribe a blanket rule that one certifier may supervise exactly two people. The number depends on whether the certifier can actually know, direct, monitor, inspect, and test the work. One high-risk excavation or complex treatment plant may require closer control than several repetitive tasks in a controlled workshop-like setting.

Factors include the worker’s demonstrated competence, the novelty and complexity of the task, consequences of failure, distance, communication, critical inspection stages, site hazards, workload, and whether work will be concealed. The supervisor reassesses when conditions change.

Remote supervision

Remote communication can support supervision after the applicable early presence period, but it is not an automatic substitute for attendance. Photographs cannot reliably prove bedding beneath a pipe, continuous grade, test pressure, or service location. Plan attendance for critical stages: layout, public connection, excavation controls, bedding, branch orientation, testing, before-cover inspection, and commissioning as relevant.

The Board’s supervision guidelines are guidance rather than a rigid formula, but the Board may use them when evaluating whether supervision was adequate. A certifier should be able to explain why the chosen level was suitable.

Supervision plan

Before work, define scope, drawings, compliance path, hazards, hold points, communication, permitted decisions, testing, and stop-work triggers. Confirm who may nominate an on-site registered person and record that arrangement. During work, give clear instructions, check understanding, review progress, and document changes.

At completion, inspect enough of the work to support the required records. If a critical stage was missed, do not retrospectively claim it was observed. Obtain acceptable verification or expose the work.

Ending supervision

If the certifier stops supervising, notify the worker and other relevant parties promptly and document the date and scope. Ensure no one continues to present the certifier’s licence as authority. Transfer of supervision must be explicit; it is not created by sending a drawing to another certifier.

Scenario

A trainee with eight months’ experience is sent alone to install a boundary connection while the certifier watches a video call. That conflicts with the early presence expectation and provides poor control of a high-consequence task. Arrange the certifier or nominated same-trade registered or certifying person to be present.

A registered drainlayer with years of demonstrated competence installs a routine branch after the early period. The certifier may choose a different supervision level, but must still plan hold points, remain available, inspect critical work, and test before cover.

Independent source-check exercise

For 7.2 Supervision Principles: Direct vs General Supervision & Trainee Ratios, practise answering from evidence rather than recall. Write the controlling source, its edition or effective date, its scope, and the exact paragraph, table, figure, or manufacturer instruction that supports the decision. Then state the site inputs that can change the result. In this section those inputs include All non-certifiers performing restricted work require lawful supervision.; For a trainee’s first 12 months, the Board expects work in the presence of the certifier or a nominated same-trade registered or certifying person.; For an exemption holder’s first 24 months, the corresponding presence period applies..

Build a four-column check: proposed condition, source requirement, evidence observed, and action. Test the answer with one changed assumption. A different pipe size, discharge-unit load, ground condition, licence status, authority, compliance path, or consent condition may produce a different result. If it does, explain why; if it does not, show which requirement remains controlling.

Finish with a field-verification plan. Name what must be inspected before concealment, what instrument or record demonstrates it, who has authority to accept a change, and what appears on the as-built or completion file. This exercise turns an open-book fact into certifying-level judgement. It also exposes accidental mixing of standards: if the source for a dimension differs from the source for the test or approval, either return to one complete compliance path or document the proposal as an Alternative Solution. Do not promote an example value into a national rule.