Page 226 - Electrical Installation in Hazardous Area

190 Electrical installations in hazardous areas

Table 8.4 Degrees of protection of enclosures
Number First numeral Second numeral
Protection Against liquids
against solids
afforded

0 No protection of persons No protection
against contact with live or
moving parts. No protection
of equipment against ingress
of solid foreign bodies.
1 Protection against accidental Protection against drops of
or inadvertent contact with condensed water. Drops of
live or moving parts inside condensed water falling on the
the enclosure by a large enclosure shall have no harmful
surface of the human body, effect.
for example, a hand, but not
protection against deliberate
access to such parts.
Protection against ingress of
large solid foreign bodies.
2 Protection against contact Protection against drops of liquid.
with live or moving parts Drops of falling liquid shall have
inside the enclosure by no harmful effect when the
fingers. Protection against enclosure is tilted at any angle up
ingress of medium size solid to 15" from the vertical.
foreign bodies.
3 Protection against contact Protection against rain. Water
with live or moving parts falling in rain at an angle of up to
inside the enclosure by tools 60 with respect to the vertical
wires or such objects of shall have no harmful effect.
thickness greater than
2.5 mm. Protection against
ingress of small solid foreign
bodies.
4 Protection against contact Protection against splashing.
with live or moving parts Liquid splashing from any
inside the enclosure by tools direction shall have no harmful
wires or such objects of effect.
thickness greater than 1 mm.
Protection against ingress of
small solid foreign bodies.
5 Complete protection against Protection against water jets. Water
contact with live or moving projected by a nozzle from any
parts inside the enclosure. direction under stated conditions
Protection against harmful shall have no harmful effect.