The IP code (IEC 60529) unpicked digit by digit · Testing bodies’ explainers read on 7 November 2026

How much water and dust does the product’s IP code withstand?

The two digits are not a single grade but two separate ladders read in turn: the first says which objects and how much dust the enclosure stops, the second what kind of water it met in the standard’s tests, from splashes to immersion. Put your code on the ladders, then ask it about the real scenario: rain, hose, or dropped in a puddle.

The code’s ladders: the first digit climbs from fingers to dust-tight, the second from vertical drops to immersion and hot jets (9). Your values light the steps up to them; 7, 8 and 9 are different tests and do not light jet steps 5 and 6. X means not specified on that side, not necessarily untested.

What your code proves and what it does not

Example: IP65 in rain, no roof above

The standard’s test covers the scenario

IP65: dust-tight, tested against water jets.

First digit 6 is the dust ladder’s top: total protection. Second digit 5 means water jets in the standard’s test, beyond what ordinary rain delivers. The code speaks of the enclosure under test conditions, covers closed; it is no mounting permit and says nothing about immersion.

Two ladders that never meet: objects, then water#

The IP code, from the international standard IEC 60529, describes how well an enclosure keeps out two different families of guests. The first digit concerns solid objects and, with them, access to the hazardous parts inside: 2 stops objects from 12.5 mm, the size that stops fingers; 4 stops those from 1 mm, thin tools and wires; 5 is “dust-protected”, with slight ingress allowed by the test while operation does not suffer; 6 is dust-tight, the ladder’s top, with no dust admitted.

The second digit concerns water and only water: 3 means fine spraying at limited angles, 4 splashing from any direction, 5 water jets, 6 powerful jets, 7 the effects of temporary immersion, tested at one metre for 30 minutes for small products (depth and duration are set by the product’s size), 8 continuous immersion under conditions set by the maker, severer than 7, and 9 water jets at high temperature and pressure (IP69 in IEC; not the same as IP69K in ISO 20653, for road vehicles, and the two are not interchangeable). A code therefore reads as a pair of sentences, never as an average: on the two rated dimensions IP65 sits above IP44 (6 against 4 for solids, 5 against 4 for water), yet that says nothing about the product’s overall quality. The letter X in a digit’s place means that side is not specified (the maker need not declare it), not necessarily untested; a silence not to be filled by assumption.

From digits to life: splashes, rain, hose, puddle#

Bathroom and sink splashes are the domain of water step 4, splashing from any direction; IP44 codes live there, their first digit also stopping thin wires. Ordinary rain comes close to that test, but step 4 is a splash test, not a guarantee for every exposure to rain. Step 3 sprays only at angles limited from the vertical, so wind-driven rain can pass it horizontally. Romanian practical guides place uncovered outdoor use, exposed to rain, at IP65, the step where the buyer also gets dust-tightness — not because rain asks for jets, but because outdoor products live in both worlds at once.

The hose asks for the jet steps, 5 or 6, and here sits the most common misreading: the jet steps say nothing about immersion. An IP65 product proved it withstands jets under test conditions, not that it sits under water; immersion begins at step 7, temporary, and 8, continuous as the maker declares. In mirror image, an IP67 happy in a puddle for half an hour does not automatically earn the jet steps unless the maker declares them cumulatively. The ladders are not presumed from one another; they are read, compared, that is all.

What the code does not guarantee, however big the digits#

The code speaks of the enclosure under test conditions: covers closed, glands tightened, seals whole. The same socket with its lid raised may lose its code, depending on the maker’s declared configuration (some keep protection with a compatible plug inserted), and a gasket cracked by sun no longer holds it, and a luminaire mounted with its cable entry facing up can take water along a road the test never travelled. Ageing, knocks, opening for a bulb change and careless reassembly move the real product away from the laboratory specimen; the code stays printed while the world moves on.

Bigger than all: the IP code is no mounting permit. Where an electrical fitting may sit relative to bath, shower and running water, at what voltage and with what protections in the board, reads in the installation rules and is executed by licensed electricians; an IP65 sticker on a box answers none of those questions. Nor does the code speak of mechanical shocks (another letter, IK), of corrosion, or of the right bulb. It answers, honestly and narrowly, a single question: what did this enclosure, properly closed, prove in the tests with objects, dust and water.

The limits of this reading, stated before you lean on it#

The full standard, with flows, nozzles, distances and durations for every step, is a paid IEC publication; the page works with the steps’ names and meanings as the testing bodies publish them, and does not reproduce laboratory recipes. The scenarios translated here (rain under step 4, hose at step 5) are reasonable layings of life over steps, but life varies: a garden hose up close is not the standard’s nozzle, and a horizontal storm is not ordinary rain. For anything at stake — safety, warranty, a whole installation — the product’s data sheet and the electrician beat any decoder.

What remains from the whole reckoning is a habit that does not lie: read the two digits separately, ask the code about your exact scenario, and let no big digit speak for the other.

Frequently asked questions#

Does IP44 withstand rain on a terrace?

Step 4’s test splashes water from every direction; ordinary rain comes close to it, but the test does not guarantee every exposure to rain. The practical guides place IP44 under eaves and on covered terraces. For the uncovered outdoors, the same guides push towards IP65, which adds dust-tightness and the jet test. Closed covers and whole gaskets are part of the story, otherwise the code does not apply.

Can I hose down an IP65 lamp?

Step 5 is exactly the water-jet test, so the ordinary hose scenario is the tried one, under the standard’s conditions. A high-pressure hose held close steps outside the test’s drawing, and step 6 is the powerful-jets step. And the washed lamp must be fully closed, glands tight, or you are washing a different object from the one tested.

If it is IP67, can I leave it submerged?

Step 7 covers temporary immersion, tested at 1 metre for 30 minutes for small products (depth and duration are set by the product’s size), not a permanent life under water. Continuous immersion is step 8, under the conditions the maker declares in its documentation. “It survived once” does not turn into a residence permit under water.

Is IPX7 better than IP67?

They are statements about different things: X means the objects-and-dust side is not specified (the maker need not declare it), not necessarily untested. An IPX7 can be perfect against water and wide open to dust; IP67 declares both. The honest comparison runs digit by digit, not by the code’s general impression.

Is IP65 enough for my bathroom, by the shower?

The code alone does not answer that. Where electrical fittings may sit relative to bath and shower, at what voltages and with what protections, belongs to the installation rules and the product documentation, and the fitting is done by a licensed electrician. IP tells you only what the enclosure proved against test water; the mounting decision cannot be taken from a decoder.

Why did my new IP65 lamp fog up inside?

The code stops test water and dust; the mist sometimes seen inside comes from humidity of the air sealed within condensing on cooling, a known sight with big temperature swings. Knocked gaskets, a cover refitted carelessly or a loose cable gland change the picture; if water stands pooled, you have left the condensation story and the shop or maker has the word.

Sources and how they were checked#

IEC 60529 itself is a paid publication, and the IEC’s explainer page refused automated access (403) on 7 November 2026; the definitions printed here follow two testing and certification bodies’ explainers (TÜV Rheinland for the solid steps and the test frame, Intertek for the water steps and step 7’s condition), quoted the same day through a technical reader and corroborated directly in the Romanian practical guide from GECA, read in full. Step 9 (hot high-pressure jets, IP69) and its difference from IP69K in ISO 20653 come from the same technical reader, on 7 November 2026. The jet nozzles’ sizes are not reproduced here because the accessed explainers do not print them; the page speaks at the level of steps, not of laboratory parameters. Nothing here is electrical-installation advice.