IP RATING SYSTEM

Charts and Tables explaining the IP Rating Sytem ,Code Breakdown, Solid Particle Protection, Liquid Ingress Protection, Additional Letters Coding, Mechanical Impact Resistance, IPX Coding, IP69K Coding and NEMA Coding.

IP RATING SYSTEM

EN 60529 outlines an international classification system for the sealing effectiveness of enclosures of electrical equipment against the intrusion into the equipment of foreign bodies (i.e. tools, dust, fingers)and moisture.

This classification system utilizes the letters "IP" ("Ingress Protection") followed by two or three digits. (A third digit is sometimes used.

An "x" is used for one of the digits if there is only one class of protection; i.e. IPX4 which addresses moisture resistance only.)

CODE BREAKDOWN

VIP indication Solid particle protection Liquid ingress protection Mechanical impact resistance Other protections
VIP Single numeral: 0-6 Single numeral: 0-8 Single numeral: 0-9 Single letter
Mandatory Mandatory Mandatory No longer used Optional

SOLID PARTICLE PROTECTION

The first digit of the IP code indicates the degree that persons are protected against contact with moving parts (other than smooth rotating shafts, etc.) and the degree that equipment is protected against solid foreign bodies intruding into an enclosure.

Level Object size protected against Effective against
0 - No protection against contact and ingress of objects
1 >50mm Any large surface of the body, such as the back of a hand,but no protection against
deliberate contact with a body part
2 >12.5mm Fingers or similar objects
3 >2.5mm Tools, thick wires, etc.
4 >1mm Most wires, screws, etc.
5 Dust protected Ingress of dust is not entirely prevented, but it must not enter in sufficient quantity
to interfere with the satisfactory operation of the equipment; complete protection against contact
6 Dust tight No ingress of dust; complete protection against contact

LIQUID INGRESS PROTECTION

The second digit indicates the degree of protection of the equipment inside the enclosure against the harmful entry of various forms of moisture (e.g. dripping, spraying, submersion, etc.)

Level Protected against Testing for Details
0 Not protected - -
1 Dripping water Dripping water (vertically falling drops) shall
have no harmful effect.
Test duration: 10 minutes
Water equivalent to 1mm rainfall per minute
2 Dripping water when
tilted up to 15°
Vertically dripping water shall have no harmful effect
when the enclosure is tilted at an angle up to 15°
from its normal position.
Test duration: 10 minutes
Water equivalent to 3mm rainfall per minute
3 Spraying water Water falling as a spray at any angle up to 60°
from the vertical shall have no harmful effect.
Test duration: 5 minutes
Water volume: 0.7 litres per minute
Pressure: 80-100 kPa
4 Splashing of water Water splashing against the enclosure from any direction
shall have no harmful effect.
Test duration: 5 minutes
Water volume: 10 litres per minute
Pressure: 80-100 kPa
5 Water jets Water projected by a nozzle (6.3mm) against
enclosure from any direction shall have no harmful effects.
Test duration: at least 15 minutes
Water volume: 12.5 litres per minute
Pressure: 30 kPa at distance of 3m
6 Powerful water jets Water projected in powerful jets (12.5mm nozzle) against
the enclosure from any direction shall
have no harmful effects.
Test duration: at least 3 minutes
Water volume: 100 litres per minute
Pressure: 100 kPa at distance of 3m
7 Immersion up to 1m Ingress of water in harmful quantity shall not be possible when
the enclosureis immersed in water under defined conditions
of pressure and time (up to 1m of submersion).
Test duration: 30 minutes
Immersion at depth of at least 1m measured at
bottom of device, and at least 15cm measured
at top of device
8 Immersion beyond 1m The equipment is suitable for continuous immersionin water
under conditions which shall be specified by the manufacturer.
Normally, this will mean that the equipment is hermetically sealed.
However, with certain types of equipment, it can mean that water
can enter but only in such a manner that it produces
no harmful effects.
Test duration: continuous immersion in water
Depth specified by manufacturer
9k Powerful high temperature
water jets
Protected against close-range high pressure, high
temperature spray downs.
-

ADDITIONAL LETTERS

The standard defines additional letters that can be appended to classify only the level of protection against access to hazardous parts by persons:

Level Protected against access to hazardous parts with
A Back of hand
B Finger
C Tool
D Wire

Further letters can be appended to provide additional information related to the protection of the device:

Letter Meaning
F Oil resistant
H High voltage device
M Device moving during water test
S Device standing still during water test
W Weather conditions

MECHANICAL IMPACT RESISTANCE

An additional number has sometimes been used to specify the resistance of equipment to mechanical impact. This mechanical impact is identified by the energy needed to qualify a specified resistance level, which is measured in joules (J). This has now been superseded by the separate IK number specified in EN 62262.

Although dropped from the 3rd edition of IEC 60529 onwards, and not present in the EN version, older enclosure specifications will sometimes be seen with an optional third IP digit denoting impact resistance.

Newer products are likely to be given an IK rating instead.

However there is not an exact correspondence of values between the old and new standards.

Dropped IP level Impact energy Equivalent drop mass and height
0 - -
1 0.225J 150g dropped from 15cm
2 0.375J 250g dropped from 15cm
3 0.5J 250g dropped from 20cm
5 2J 500g dropped from 40cm
7 6J 1.5kg dropped from 40cm
9 20J 5.0kg dropped from 40cm
IK number Impact energy(joules) Equivalent impact
00 Unprotected No test
01 0.15 Drop of 200g object from 7.5cm height
02 0.2 Drop of 200g object from 10cm height
03 0.35 Drop of 200g object from 17.5cm height
04 0.5 Drop of 200g object from 25cm height
05 0.7 Drop of 200g object from 35cm height
06 1 Drop of 500g object from 20cm height
07 2 Drop of 500g object from 40cm height
08 5 Drop of 1.7kg object from 29.5cm height
09 10 Drop of 5kg object from 20cm height
10 20 Drop of 5kg object from 40cm height

IPX CODING

The letter X is used in any place in the code where specifying a digit is meant to be avoided (or indicates irrelevance based on the common application).

There may be various reasons for choosing this coding variant, such as marketing considerations. Thus, e.g. an IPX7 rating for a consumer device specifies that the device has water protection up to limited immersion, but gives deliberately no information as to whether the device has any protection against mechanical ingress or dust.

In the case of an IPX7 rating, however, a considerable level of protection against the ingress of solids can be assumed,as where a liquid ingress protection rating equals 7, the rating of protection against solids is rarely below 6, e.g. IP67.

Among other common IP ratings using the letter X are IPX4.

IP2X is frequently used on electrical items to specify the item must prevent finger access to live terminals i.e. plug sockets are IP2X.

IP69K

German standard DIN 40050-9 extends the IEC 60529 rating system described above with an IP69K rating for high-pressure, high-temperature wash-down applications.

Such enclosures must not only be dust-tight (IP6X), but it must also able to withstand high-pressure and steam cleaning.

The test specifies a spray nozzle that is fed with 80°C water at 8-10 MPa (80-100 bar) and a flow rate of 14-16 L/min.

The nozzle is held 10-15cm from the tested device at angles of 0°, 30°, 60° and 90° for 30 seconds each. The test device sits on a turntable that rotates once every 12seconds (5rpm).

The IP69K test specification was initially developed for road vehicles, especially those that need regular intensive cleaning (dump trucks, cement mixers, etc.), but it also finds use in other areas (for example, food industry, and car wash centers).

The IP69K rating is the highest protection available.

NEMA RATING

IP Code Min. NEMA Enclosure rating to satisfy IP Code
IP20 1
IP54 3
IP66 4, 4X
IP67 6
IP68 6P

North American enclosure rating systems are defined in NEMA 250, UL 50, UL 508, and CSA C22.2 No. 94.