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Definition of Ingress Protection (IP code)
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IEC 60529 outlines an international classification system
for the sealing effectiveness of enclosures of electrical
equipment against the intrusion into the equipment of for-
eign bodies (i.e. tools, dust, fingers) and moisture. This
classification system utilizes the letters ?IP? (Ingress Pro-
Example: IP 50 = IP
IP letter code
1st digit
2nd digit
5
0
tection) followed by two digits.
Degrees of protection - First digit
The first digit of the IP code indicates the degree to which
persons are protected against contact with moving parts
and the degree that equipment is protected against solid
foreign bodies intruding into an enclosure.
Degrees of protection - Second digit
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, sub-
mersion, etc.)
Code
0
1
2
3
4
5
6
7
8
First digit description
No special protection
Protection from a large part of the body such as hand
or from solid objects greater than 50 mm in diameter
Protection against objects not greater than 80 mm in length
and 12 mm in diameter
Protection from entry by tools, wires, etc.,
with a diameter or thickness greater than 2.5 mm
Protection from entry by solid objects
with a diameter or thickness greater than 1.0 mm
Protection from the amount of dust that would interfere
with the operation of the equipment
Dust-tight
–
–
Code
0
1
2
3
4
5
6
7
8
Second digit description
No special protection
Protection from vertically dripping water
Protection from dripping water when tilted up to 15°
Protection from sprayed water
Protection from splashed water
Protection from water projected from a nozzle
Protection against heavy seas, or powerful jets of water
Protection against temporary immersion
Protection against complete continuous submersion in water
Selection of connectors for watertight or vacuumtight devices
LEMO B and S series are rated IP50 only when mated. LEMO E, K and L series are rated IP66 (and over) only when
mated. If a device must be watertight or vacuumtight when the connectors are unmated, it is important to select a watertight
or vacuumtight socket. You can consider the following two situations:
A) Figure 1 shows a typical outdoor device. To ensure this
device retains IP66 or above when connectors are
unmated, it is important to choose a watertight socket
from B, S, E, K or L series.
B) Figure 2 shows a device which is subjected to pressure
difference such as a near vacuum or pressurized gas
and must exhibit no leakage. To ensure the device
maintains its sealing, the socket is additionally tested for
helium leakage (according MIL 1344A).
Fig. 1
your device
Fig. 2
your device
epoxy
resin seal
FGG plug K series
EGG socket K series
www.lemo.com
FGG plug B series
HGG socket B series
5
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