Exam day — checklist, common mistakes and a fixed answer rhythm

You can know the theory and still fail the practical exam — not because the knowledge is missing, but because execution under time pressure and supervision works just slightly differently than studying at home. This page bundles the practical side: what to bring, which mistakes examiners see most often, and a fixed structure for answering every question so you never draw a blank.

What to bring

A valid form of identification.
Your own NEN 3140 VP written appointment (or proof of the previous instruction, in the case of a refresher instruction) and, if applicable, your VCA certificate.
S3 safety shoes and flame-retardant work clothing — many training providers will not let you start at the practical setup without correct PPE.
Your own insulating gloves, if you already own a pair — borrowed equipment doesn't always fit, and that costs time on the day itself.
A pen (not a pencil): a switching instruction document or work permit is filled in with pen, not pencil, because a valid document must not be erasable.
Any preparation documents or diagrams that the training provider has made available in advance, printed out or available offline on a laptop or tablet — don't blindly rely on wifi on site.

What a switching instruction document (schakelbrief) contains

A switching instruction document (or work permit) is not free-form text but a fixed document with fixed parts. The exact form differs per training provider or company, but the core always comes down to the same thing:

Part	Content
Installation/group identification	Which board and which group it concerns — the exact coding as it appears on the diagram and on the installation itself, not a description in your own words
Description of the work	What is going to be done and why (replacing, repairing, measuring, testing)
Method of working	De-energised working, working in the vicinity of live parts, or live working — with the corresponding risk assessment
A checkbox per safety step	A separate box for each step of the five-step procedure (isolating, locking out, proving dead, earthing/short-circuiting, screening), so each step is signed off individually rather than all at once as "done"
Measured values	Space to record the voltage(s) actually measured — a "de-energised" checkbox with no value is not a demonstrable measurement
PPE and tools used	Which personal protective equipment and which tools were used
Permission to start	Name and signature of the work-responsible person (WV) who grants clearance
Completion report	Date, time and signature by which the person carrying out the work reports that the work is finished and the installation is back in operational condition

As with a written appointment: a switching instruction document without the signature for permission and without the completion report is an incomplete document — even if the action performed was itself correct.

Ten mistakes candidates most often stumble on

Working from the wrong diagram or the wrong group. Always check the coding on the installation itself first before picking up a diagram — never assume the diagram you happen to have in hand first is the right one.
Forgetting "proof of proof" (proef op de proef). A measurement was taken, but the voltage tester was not checked against a known voltage both before and after the measurement — as a result, a "no voltage" reading cannot be demonstrably proven reliable.
Not measuring all combinations. For a three-phase group with neutral that means ten combinations (L1-L2, L1-L3, L2-L3, L1-N, L2-N, L3-N, L1-PE, L2-PE, L3-PE, N-PE); for a single-phase group that means three (L-N, L-PE, N-PE). Skipping some "because the rest will be the same anyway" is regarded as incompletely demonstrating the absence of voltage.
Not locking out and not placing a warning sign. Switching off the circuit breaker alone is step 1, not step 2 — without a visible lock (padlock, dummy fuse-link) and a sign, someone else can unintentionally switch the installation back on.
Not taking the fuse-links along and not putting a dummy back in place. An empty fuse-carrier without a dummy is both a safety risk (a foreign object) and a sign that the isolation has not been visibly secured.
Silently skipping step 4 (earthing and short-circuiting). Skipping is allowed if the risk justifies it, but then you must argue that out loud — an examiner is specifically testing whether you understand when a step is and isn't needed, not whether you tick off a fixed list.
Confusing the test voltage of the practice setup with mains voltage. Some practical setups run on a reduced, safe training voltage instead of 230/400 V — always note the value you actually measure, not the value you expect out of habit.
Opening a load-break switch (lastscheider) under load without a screen or without first removing the load. This is a real arc-flash risk, not a theoretical rule.
Carrying out switching actions without permission from the work-responsible person or installation-responsible person. Even during an exam you are simulating the real hierarchy: operating without consultation is a stand-alone assessment error, regardless of whether the action itself was correct.
Not reporting that the work is complete. A task is only finished once you explicitly report that the installation is back in operational condition — a silent completion is regarded as an incomplete procedure.

A fixed rhythm for every practical question

When an examiner asks a question about a specific action, a fixed order helps you forget nothing, even under pressure:

What is the task and what is the risk? First briefly state what needs to happen and which hazard is associated with it.
Which group does this belong to according to the diagram? Point out the group and explain how you recognise it.
Which permission do you need, and from whom? Explicitly name the work-responsible person or installation-responsible person.
Work through the five steps of de-energised working, with a reason at every step. Not just what you do, but why — including an explicit reason if you deliberately skip a step.
Which PPE and which tools do you use? Name the concrete items, not "the correct PPE" in general.
Which measurements do you take, and against which standard do you test the outcome? State the concrete limit value, not just the measurement method.
How do you finish up? Switch back on in the correct order, and explicitly report that the work is complete.

Even if you forget a detail, this structure shows that you reason from a systematic working method — and that is precisely what a VP written appointment means in practice: not knowing a list by heart, but arriving at a decision in a repeatable, accountable way.

The evening before

Briefly run through the core values you need to know by heart: the five steps, the B/C/D table, the key figures (1 MΩ insulation, 0.4 s disconnection time for TN 230 V final circuits, 30 mA personal protection, 50 V safe touch voltage).
If the training provider allows it, fill in a blank work permit or switching instruction document at home in advance for the type of task you expect — the point is not to memorise the exact answer, but getting used to the format and order of filling it in saves time and stress on the day itself.
Repeat a few fixed reporting phrases out loud (asking permission, announcing that you are demonstrating the absence of voltage, reporting completion) — see the separate page on practical Dutch for the exam for a complete list.