# Eighty percent is a warning, not a ban > The threshold neither blocks the work nor approves it. It says an engineer needs to look here. That difference decides who carries the responsibility. Source: https://naasson.com/en/blog/eighty-percent-is-a-warning/ Published: 2026-04-15 Language: en Direction: Power by Naasson (https://naasson.com/en/power/) Publisher: Naasson — https://naasson.com --- Exceeding 80 percent of design power is flagged as a risk. Not as an error, not as a violation, not as grounds to refuse the description. That choice looks soft. It is deliberate, and it is worth explaining why. ## Why not a ban Because the tool does not know the context in which exceeding the threshold is acceptable. 80 percent on a circuit with a constant, measured load is one thing. 80 percent of an estimated load, calculated with margin from nameplate ratings the equipment never reaches, is another. 80 percent on a temporary layout used during installation is a third. A ban in all three cases would mean the tool makes a decision it has no data for. And since the work has to go on, a workaround for the ban would appear within the first week. After that, every ban would be bypassed by default. ## Why not silence Because 80 percent is a real attention boundary. Above it, inrush currents, summer heat and one extra consumer start to trip the protection. The place where this will happen is known in advance. Not mentioning it means hearing about it from operations. ## What a warning must contain The location. The value. And a statement that engineering confirmation is required. Without the last item a warning turns into noise. A person sees a yellow mark, does not understand what is expected, and learns to ignore it. It is the same mechanism that kills alerting channels. ## Where the same principle applies A missing cable label. Not a model error, but an operational risk: without a label, any investigation on site becomes a manual search. An undeclared separation between low-voltage and power routes. The tool does not know whether they are physically separated. It knows the description says nothing about it. A link longer than the planning length. 100 metres for copper is a planning limit, not a physical one. Exceeding it sometimes works and is always a risk. Missing records for earthing, residual-current protection, uninterruptible power. Not a ban, but a statement that there is no evidence. ## The common logic The tool keeps the body of evidence and warns about risks. It does not create a false sense of confirmed compliance and does not select protective devices for the engineer. This has a practical consequence for reading the report. Yellow marks are not a list of unfinished work. They are a list of questions for the engineer. Some will be closed with "this is intended, and here is why". That answer also belongs in the description, so the mark does not come back next time. ## What happens when the threshold becomes a ban A familiar scenario. The tool refuses the description, installation goes ahead anyway, and the site starts to live in two realities: the model, which is missing the "inconvenient" nodes, and the actual state. A model with the inconvenient parts removed is worse than no model at all, because people trust it.