The Checks Safe to Delegate and the Ones That Aren't
Why this matters
When you diagnose through a helper, the first decision is not how to guide the check. It is whether this check should be in their hands at all. Some checks a trained apprentice runs solo all day. Some are fine only with you live on the line. And some do not belong with a green hand under any coaching, because they are dangerous, or because the answer lives in a judgment their senses cannot make yet. Get the line wrong toward "safe" and you risk an injury or a wrong condemnation. Get it wrong toward "unsafe" and you drive out for a filter check. This card is where the line sits and why.
Two axes set the line: hazard and judgment
Every diagnostic check falls somewhere on two questions.
- Hazard: can this step hurt the person doing it? Stored energy, live conductors, gas, pressure, height, chemical, confined space.
- Judgment: does reading it right require experience their hands and senses do not have yet, or is it a plain number or visual anyone trained can capture?
The hazard axis is a hard gate. The judgment axis is a "verify harder" flag, not a stop. Sort the check on both before you hand it over.
The three tiers
| Tier | Nature of the check | Examples across trades |
|---|---|---|
| Safe to delegate solo | Low hazard, plain observable | Filter condition, water flow at a fixture, a breaker on or off by feel of the handle, tank level, visible leak or dry, nameplate data |
| Delegate on a live line | Low-to-moderate hazard within their training, needs setup or interpretation | A capacitor reading, a voltage present-or-absent on a circuit they are qualified for, a pressure gauge value, a temperature split, continuity on a de-energized part |
| Never to a green hand | Real hazard for their level, or a judgment their senses cannot make | Verifying a circuit dead before contact, opening an energized panel, gas leak confirmation, relieving system pressure, a subtle bearing feel or flame color, anything requiring a qualified person they are not |
Match the check to the hand and the channel. A tier-two check handed off solo, with no live line, is how a right procedure produces a wrong or unverified answer.
The hazard line does not bend for a waiting customer
The pressure to coach a green hand across a hazard is real and the answer is always no.
- A step that requires a qualified person - electrical work on energized equipment, gas work, pressure work - stays with someone qualified, not someone you talk through it. Regulations that name qualified persons exist because coaching does not substitute for training on the thing that can kill.
- The safe version of a hazardous check is often having them secure and de-energize from a safe position first, if that itself is within their training, and leaving the live measurement for a qualified hand.
The judgment line: what does not travel down the phone
Some answers are not dangerous, just untransmittable through an inexperienced hand.
- A subtle flame color, the feel of a bearing's play, a faint smell, a vibration you would know in your fingertips - these need experienced senses on site. A green hand can report "it looks blue-ish," and you cannot bank a condemnation on that.
- The tell: if the decision rests on a qualitative judgment rather than a number or a clear yes/no, the borrowed hand is probably not enough. Route it to a number where one exists, or to your own senses where one does not.
The line moves with the specific hand
These tiers describe a green helper. The boundary is per-person and per-training, not fixed, so re-draw it for the hand you actually have.
- A second-year who has run a check fifty times under supervision may own it solo; a first-week helper does not, even on the same check.
- Formal qualification, not comfort, sets the hazard line. "I think I can" does not clear a step that regulation says needs a qualified person.
- As you build the hand up, checks migrate from tier three toward tier one. That migration is the point of training. See related: Building an Apprentice's Diagnostic Vocabulary Over Time.
References
- OSHA guidance on qualified persons for electrical, energized, and hazardous work
- Trade-standard practice for apprentice scope of work and supervision
- See related: Diagnosing Through a Helper Who's Your Only Hands on Site; Talk the Apprentice Through It or Drive Out Yourself