Electric Motor Control Basics - Book - Page 93
Understanding IP Ratings
Level 4: Greater Than 1mm
This rating protects against small tools and tiny equipment such as screws and wires.
Each object must be greater than 1 millimeter.
Level 5: Dust Protection
This rating protects against all forms of contact and most dust. While there’s no way
to prevent dust from ingressing the enclosure at this level, this step helps cut down its
Level 6: Dust-Tight
The component is completely dust-tight.
Protection from Liquids
The second number in the IP rating describes how well-protected the electric
component is from all kinds of liquids. These levels range from 1 to 9, with protection
growing at every interval.
This will come after the words “IP” and the first number (describing solids protection).
As with the first number, if there is no unique number here, you’ll place an “X”.
Level 1: Vertical Dripping Water
A number one on the end of an IP rating protects a component against dripping water.
As long as the drops flow vertically, they should have no negative or harmful effect on
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