Simrad AP25 - Manual (Page 161)

Technical specifications
20221495F
159
8.12 IP protection
Each part of a Simrad autopilot system has a two digits IP
protection code.
The IP rating is a method to classify the degree of protection
against solid objects, water ingress and impact afforded by
electrical equipment and enclosures. The system is recognised in
most European countries and is set out in a number of British
and European standards.
The first code number describes the protection against solid
objects, and the second number describes the protection against
liquids.
FIRST NUMBER
Protection against solid
objects
SECOND NUMBER
Protection against liquids
IP TESTS IP TESTS
0 No protection 0 No protection
1 Protection against solid
objects up to 50 mm, eg.
accidental touch by hands.
1 Protected against vertically falling
drops of water (eg. condensation).
2 Protection against solid
objects up to 12 mm, eg.
fingers.
2 Protected against direct sprays of water
up to 15° from the vertical.
3 Protection against solid
objects over 2.5 mm (tools +
wires)
3 Protected against sprays to 60° from the
vertical.
4 Protection against solid
objects over 1 mm (tools +
wires + small wires)
4 Protected against water sprayed from
any direction.
5 Protection against dust -
limited ingress (no harmful
deposit)
5 Protected against low pressure jets of
water from all directions - limited
ingress permitted.
6 Totally protected against
dust
6 Protected against strong jets of water,
eg. for use on shipdecks - limited
ingress permitted.
7 Protected against the effects of
immersion between 15 cm and 1 m.
8 Protected against long periods of
immersion under pressure.