Watson-Marlow 520DuN IP66/NEMA 4X User Manual
12
IP (Ingress Protection) and NEMA definitions
* 520N cased pumps are rated to NEMA 4X (indoor use) only.
IP
NEMA
1st Digit
2nd Digit
3
Protected against
ingress of solid objects
with a diameter of
more than 2.5mm.
Tools, wires etc with a
thickness of more than
2.5mm are prevented
from approach
1
Protection against
dripping water falling
vertically. No harmful
effect must be
produced
2
Indoor use to provide a
degree of protection
against limited amounts
of falling water and dirt
5
Protected against
harmful dust deposits.
Ingress of dust is not
totally prevented but
the dust must not
enter in sufficient
quantity to interfere
with satisfactory
operation of the
equipment. Complete
protection against
contact
5
Protection against
water projected from a
nozzle against the
equipment (enclosure)
from any direction.
There must be no
harmful effect (water
jet)
12
Indoor use to provide a
degree of protection
against dust, falling dirt
and dripping, non-
corrosive liquids
13
Indoor use to provide a
degree of protection
against dust and
spraying water, oil and
non-corrosive coolants
6
Protection against
ingress of dust (dust-
tight). Complete
protection against
contact
6
Protection against
heavy seas or powerful
water jets. Water must
not enter the
equipment (enclosure)
in harmful quantities
(splashing over)
4X
Indoor or outdoor* use
to provide a degree of
protection against
splashing water, wind-
blown dust and rain,
hose-directed water;
undamaged by the
formation of ice on the
enclosure. (Resist
corrosion: 200-hour salt
spray)
