IP Ratings for Industrial Motors: What You Really Need to Know

What's an IP Rating Anyway?

When you’re picking out motors for industrial use, you’ll spot those “IP” numbers everywhere. IP stands for Ingress Protection – basically how well your motor can keep dust and water out. And yes, it matters a lot more than most people think.

Breaking Down the Code

IP ratings aren’t particularly exciting, but they’re dead useful. Think of them as a shorthand way of knowing if your motor will survive its working environment. The system uses two numbers:

First number (0-6): How well it keeps solid bits out

Second number (0-9): How waterproof it is

Higher numbers mean better protection – simple as that. Sometimes you’ll see a third digit for special cases, but it’s rare.

IP

IP Stands for:
Ingress
Protection

6

First number (0-6): How well it keeps solid bits out

6

Second number (0-9): How waterproof it is

The Dust Defence (First Digit)

The first digit tells you how well your motor handles everything from fingers to fine dust:

  • IP2X: Stops fingers poking inside
  • IP3X: Safe from tools and thick wires
  • IP4X: Keeps out most screws and small wires
  • IP5X: Mostly dustproof (some might still get in)
  • IP6X: Totally dustproof – nothing’s getting through
The Water Story (Second Digit)

The second digit deals with everything from light drizzle to full underwater use:

  • IPX2: Can handle some dripping water when tilted
  • IPX3: Won’t die in light spray from various angles
  • IPX4: Handles splashing from any direction – minimum required for any rainfall exposure
  • IPX5: Withstands low-pressure water jets
  • IPX6: Stands up to powerful water jets
  • IPX7: Can be submerged briefly (up to 1m for 30 minutes)
  • IPX8: Works while permanently underwater at specified depths – often designed to operate completely submerged, sometimes requiring submersion for cooling purposes
  • IPX9K: Survives close-range high-pressure, hot water cleaning – essentially IP66 but for hot water and steam applications
Real-World Ratings You'll Actually See

Here’s the thing – higher IP ratings cost more money. It’s possible that selecting a higher IP rating could increase the cost of the motor, however it’s important to get it right to avoid premature failure.

Consider:

  • Where’s it going? Dry indoor space vs. outdoor exposure makes a massive difference.
  • What’s in the air? Sawdust in a woodshop needs different protection than flour dust in a bakery.
  • How wet will it get? Light rain exposure needs at least IPX4 protection, while applications with regular hosing need higher ratings.
  • Industry requirements? Food and pharmaceutical industries often have specific standards.
Picking the Right IP Rating For Your Application
  • Understand Abbreviations: Familiarise yourself with common abbreviations used on IEC motor nameplates.
  • Check for Deviations: Ensure the motor’s operating conditions do not deviate significantly from the nameplate specifications.
  • Consult Documentation: Refer to the motor’s user manual or the manufacturer’s website for more detailed information.
Testing: How We Know What We Know

Motors don’t just get their IP ratings by looking pretty. They’re put through proper torture tests – blasted with water jets, submerged, and filled with talcum powder to simulate dust. It’s all standardised under IEC 60529, so an IP65 motor from one manufacturer should offer the same protection as another’s.

Bottom Line

The IP rating might just be a couple of numbers, but they tell you exactly what your motor can handle. Get it wrong, and you’ll be replacing motors far sooner than planned. Get it right, and your equipment will keep running through whatever your environment throws at it. And sometimes, that’s the difference between a profitable operation and one plagued by downtime.