IP41 Test

The best way is to look in the actual standard as the information on how large the nozzles need to be and how far they need to be spaced is in there (as well as test duration and pass criteria).

From memory the test setup for IPx1 (Protection against vertically falling drops of water) consists of rows of gravity-fed hypodermic needles fitted to the bottom of a water-filled container.

I don't remember the exact size of the needles or the test duration (it is listed in the appropriate standard or possibly available on the internet using a search). The needles were a standard size of commonly-available hypodermic needle.

Thanks for you help!

we have had a look at the standard but it only states the pitch between each nozzle should be 20mm but it mentions nothing about the nozzle hole diameter.

it does say that the water must decrease by 1mm/Min and that it must be tested for at least 10min. do you know of the calculation used to give the nozzle hole diameter that is required to achieve these results?

Regards

No I don't know the calculation.

What standard are you working to? I remember the information was in the AS (Australian) and AS/NZS (Joint Australian and New Zealand) standards but our copy has gone missing.

You may be able to find the information buried in your standard (IEC/EN 60529 perhaps?) or possibly off the internet. Depending on what standard you are using there may be a substandard detailing just the test rig construction criteria, so also try a search of the standards websites.

Now where has my damn IP standard gone.

Is that 1mm/min rise of level in the enclosure?

If so, then it doesn't depend upon the nozzle diameter. It depends upon the construction of the enclosure.

1mm/min in terms of a liquid flowrate is meaningless without knowing the area of the duct through which it flows. A pipe is oversized, generally speaking, if the velocity in it is less than 1m/sec.

Please clarify the original question.