ISO P010 Do Not Touch Sign

A Behavior Ban That Works for Many Hazards

P010 forbids one action: touching the marked object or surface. The pictogram of a hand crossed by the red bar is intentionally hazard-agnostic — the reason contact is dangerous may be an energized conductor, a surface hot or cold enough to burn, a moving part, a corrosive residue, a contamination-controlled component, or an instrument whose reading a fingertip would disturb. Whatever the cause, the required behavior is identical, and that is what the sign communicates.

The flip side of that generality is that P010 explains nothing. A worker who does not understand why contact is forbidden may judge the rule optional, especially on equipment that looks inert. On anything beyond an obvious case, add a short supplementary line — LIVE TERMINALS, SURFACE TO 180 °C, CALIBRATED: DO NOT HANDLE — or mount the matching warning sign next to it so the prohibition has a visible justification.

P010 or a Warning Sign? Choosing the Right Message

ISO 3864 separates the two jobs cleanly: warning triangles such as W017 (hot surface) or W012 (electricity) identify a hazard, while the red circle of P010 commands a behavior. Use the warning when people must work near the hazard and simply need to know it exists; use P010 when the control strategy is that nobody's hands go on the item at all. On high-consequence equipment the strongest labeling combines both, hazard above, prohibition below.

P010 also serves cases that are not personal-injury hazards. Semiconductor tooling, optics, cultured samples, wet paint, museum exhibits, and reference standards get marked because touch damages the object or the process rather than the person. That is a legitimate use of the symbol, but keep such postings visually distinct from safety-critical ones on the same site — if every bench label looks equally severe, the label on the energized busbar loses its force.

Mounting Directly on the Point of Contact

Unlike area signs, P010 earns its keep at close range. Apply it on or immediately beside the specific surface, terminal cover, guard, or housing it protects — a 50 mm label on a control panel or motor casing is often more effective than a 200 mm sign on the wall three meters away, because the eye meets it in the instant before the hand moves. On large plant, repeat the label at each realistic touch point rather than assuming one placement covers the machine.

Durability drives material choice here more than for most prohibition signs. Labels on hot housings, washdown equipment, or solvent-wiped lab benches face heat, chemicals, and abrasion; a faded or half-peeled do-not-touch label communicates that the rule itself has lapsed. Specify temperature-rated, chemically resistant stock for those services and include the labels in routine inspection rounds.

What a Sign Cannot Do

P010 never substitutes for engineering controls that the law requires. Exposed live parts must be guarded or enclosed under electrical safety rules, and dangerous moving machinery must be physically guarded — OSHA's machine guarding standard (29 CFR 1910.212) and equivalent EU machinery requirements do not accept signage in place of a guard. The proper role of the label is residual: it reinforces the rule at points where a guard is opened for maintenance or where a hazard cannot be fully enclosed.

For work that requires deliberate contact with normally forbidden equipment, the sign integrates with procedures rather than being removed. Lockout/tagout isolates the energy, a permit defines the task, and the standing P010 marking continues to protect everyone not on that permit. Auditing near-misses at marked equipment is worthwhile: repeated casual contact usually means the touch point is in the natural path of a routine task, and relocating a handle or adding a physical standoff fixes what another sticker will not.

When should I use a do not touch sign instead of a hot surface warning?

Use W017 when people work near the hot item and need to know the hazard exists; use P010 when the rule is that no one touches the item at all. The warning informs, the prohibition commands. For equipment that is both hot and strictly hands-off, posting the two together is the clearest labeling.

Is a do not touch sign acceptable protection for live electrical parts?

No. Electrical regulations require live parts to be guarded, enclosed, or otherwise made inaccessible; a sign is not a permitted substitute for those physical controls. P010 is appropriately used on enclosures and covers as a reinforcement, and during maintenance in combination with lockout/tagout, not as the primary safeguard.

Can P010 be used to protect equipment or products rather than people?

Yes. The ISO-defined function is simply to prohibit touching, and it is routinely applied to calibrated instruments, cleanroom tooling, optics, wet coatings, and exhibits where contact would damage the item or the process. Just keep asset-protection labels distinguishable from injury-critical ones so the strongest postings retain their urgency.

How big should a do not touch label on machinery be?

Match it to the reading distance at the touch point. A 50 mm diameter label suits panels, housings, and bench equipment read at arm's length; step up to 100 mm or more when the sign must be noticed on approach across a room. Placing the label at each realistic contact point matters more than maximizing any single label's size.