Electric Motor Control Basics - Book - Page 95
Understanding IP Ratings
Level 7: Up to 1 Meter Immersion
Under defined pressure conditions, operators can submerge this component in water
for up to 30 minutes in depths of 15cm to 1 meter.
Level 8: Immersion Beyond 1 Meter
These components can handle longer immersions at greater depths with limited
ingress. Each manufacturer will set and advertise its own testing parameters.
Depending on the equipment in question, other metrics tested may include
temperature fluctuations and flow rates.
Level 9: (K) High Water Pressures and Temperatures
This component is protected against high-pressure and high-temperature jet sprays,
steam-cleaning processes or wash-downs. This standard is most common in road
vehicle applications. For more information, see Standard ISO 20653:2013 Road
Vehicles - Degrees of Protection.
Part 1, Contactors
Basics: Part 2,
Basics: Part 3,
The Benefits of Type E/F
Basic Pump Control:
Three Phase DOL Starter
Control of an Electric Pump
Applying Motor Control
in a Wastewater
NEMA vs IEC Motor