Ip Protection - Simrad Robertson AP9 Mk3 Instruction Manual

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.
Protection against solid
IP TESTS
0 No protection
1 Protection against solid
objects up to 50 mm, eg.
accidental touch by hands.
2 Protection against solid
objects up to 12 mm, eg.
fingers.
3 Protection against solid
objects over 2.5 mm (tools
+ wires)
4 Protection against solid
objects over 1 mm (tools +
wires + small wires)
5 Protection against dust -
limited
harmful deposit)
6 Totally protected against
dust
20169223D
FIRST NUMBER
objects
ingress (no
Technical Specifications
SECOND NUMBER
Protection against liquids
IP TESTS
0 No protection
1 Protected against
falling drops
condensation).
2 Protected against direct sprays of
water up to 15° from the vertical.
3 Protected against sprays to 60°
from the vertical.
4 Protected against water sprayed
from all directions - limited
ingress permitted.
5 Protected against low pressure
jets of water from all directions -
limited ingress permitted.
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.
vertically
of water (eg.
4-13