Simrad Robertson AP9 Mk3, Instruction Manual, Page: 89 / 202

Technical Specifications
20169223D
4-13
4.16 IP protection
Each part of a Robertson autopilot system has got a two digits IP
protection code.
The IP rating system provides a means of classifying the degrees of
protection from dust, water 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 all directions - limited
ingress permitted.
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.