Electric Motor Control Basics - Book - Page 94
Understanding IP Ratings
Level 2: 15-Degree Tilted Water
Water doesn’t always flow straight down. If it flows at a 15-degree angle from its
current position and there is no risk of damage or danger when it makes contact with
the component, it receives a Level 2 rating.
Level 3: Spraying Water
This rating protects against water falling as a spray. It can fall at any angle up to 60
degrees from its original vertical.
Level 4: Splashing Water
This rating notes protection against splashing water. If this water comes into contact
with the enclosure from any direction, no damage will occur. Testers perform tests for
10 minutes with an oscillating spray to assess ingress.
Level 5: Low-Pressure Water Jets
This rating signifies that the component can handle low-pressure water jets (6.3
mm) with ease. If the enclosure gets sprayed down by a hose nozzle, for instance, it’s
protected.
Level 6: High-Pressure Water Jets
This component is safe against even the most powerful jets or streams of water,
including heavy seas. It can receive the impact from any direction without a negative
effect.
Industrial Control
Basics:
Part 1, Contactors
Industrial Control
Basics: Part 2,
Overload Relays
Industrial Control
Basics: Part 3,
Starters
The Benefits of Type E/F
Motor Protection
Circuit Breakers
Basic Pump Control:
Three Phase DOL Starter
Control of an Electric Pump
Applying Motor Control
in a Wastewater
Application
NEMA vs IEC Motor
Controls
Understanding
IP Ratings
94
