Ohio Class, Ballistic Missile Nuclear Powered Submarine, USS Kentucky SSBN737


IP ratings:

The IP classification is used to express just how safe a component is in various conditions, touch by hand, water, dust or moisture.
The symbols and numbers are shown below:
  First digit, protected
against solid objects:

Protected

   Second digit, protected
against fluids:

Protected
0 Image/ip1.bmp (2422 bytes) No protection 0 Image/ip1.bmp (2422 bytes) No protection
1 Image/ip2.bmp (2462 bytes) Against 50 mm
objects, fx.
hands.		 1 Image/ip8.bmp (1630 bytes) Against vertically
falling drops of
water.
2 Image/ip3.bmp (2442 bytes) Against 12 mm
objects, fx.
fingers.		 2 Image/ip9.bmp (1630 bytes) Against direct sprays
of water up to 15*
from vertical.
3 Image/ip4.bmp (1886 bytes)     Against 2.5 mm    
objects, fx.
tools & wires.		 3 Image/ip10.bmp (2082 bytes) Against direct sprays
of water up to 60*
from vertical.
4 Image/ip5.bmp (1838 bytes) Against 1.0 mm
objects, fx.
tools & wires &
small wires.		 4 Image/ip11.bmp (2302 bytes) Against water sprays
from ALL directions.
Limited ingress
permitted.
5 Image/ip6.bmp (1742 bytes) Against dust,
limited ingress.
No harm full de-
posit.		 5 Image/ip12.bmp (3062 bytes) Against low pressure
jets from all directions,
limited ingress
permitted.
6 Image/ip7.bmp (2462 bytes) Totally against
dust.		 6 Image/ip13.bmp (3230 bytes) Against strong jets of
water, eg. for use on
ship decks, limited
ingress permitted.
      7 Image/ip14.bmp (3278 bytes) Against the effects of
temporary immersion
between 15 cm and
100 cm
Duration of tests: 30 min.
      8 Image/ip15.bmp (3278 bytes) Against long periods
of immersion under
pressure.

So, let's say that we have an item rated "IP68":
The first digit (6) tells us that it's "Totally against dust." The second digit (8) tells us that it's protected "Against long periods of immersion under pressure.", in plain English: Watertight down to the specified depth.
 


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