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Definition of Ingress Protection (IP code)
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-
tection) followed by two digits.
Example: IP 50 = IP
5
0
IP letter code
1st digit
2nd digit
Degrees of protection - First digit
Degrees of protection - Second 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.
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.)
First digit description
No special protection
Second digit description
No special protection
Code
Code
0
1
2
3
4
5
6
7
8
0
1
2
3
4
5
6
7
8
Protection from a large part of the body such as hand
or from solid objects greater than 50 mm in diameter
Protection from vertically dripping water
Protection against objects not greater than 80 mm in length
and 12 mm in diameter
Protection from dripping water when tilted up to 15°
Protection from sprayed water
Protection from entry by tools, wires, etc.,
with a diameter or thickness greater than 2.5 mm
Protection from entry by solid objects
Protection from splashed water
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
Protection from water projected from a nozzle
Protection against heavy seas, or powerful jets of water
Protection against temporary immersion
Dust-tight
–
–
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 T 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 water-
tight 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 T 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
Fig. 2
your device
your device
epoxy
resin seal
FGG plug B series
FGG plug K series
HGG socket B series
EGG socket K series
Check temperature range (see section on pages 30, 47, 55, 91 and 101).
www.lemo.com
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