Automating Manufacturing Systems - Process Control and ...

plc electrical - 31.16
Type 1 - General purpose - indoors
Type 2 - Dirt and water resistant - indoors
Type 3 - Dust-tight, rain-tight and sleet (ice) resistant - outdoors
Type 3R- Rainproof and sleet (ice) resistant - outdoors
Type 3S- Rainproof and sleet (ice) resistant - outdoors
Type 4 - Water-tight and dust-tight - indoors and outdoors
Type 4X - Water-tight and Dust-tight - indoors and outdoors
Type 5 - Dust-tight and dirt resistant - indoors
Type 6 - Waterproof - indoors and outdoors
Type 6P - Waterproof submersible - indoors and outdoors
Type 7 - Hazardous locations - class I
Type 8 - Hazardous locations - class I
Type 9 - Hazardous locations - class II
Type 10 - Hazardous locations - class II
Type 11 - Gas-tight, water-tight, oiltight - indoors
Type 12 - Dust-tight and drip-tight - indoors
Type 13 - Oil-tight and dust-tight - indoors
Factor
1
2
3
3R
3S
4
4X
5
6
6P
11
12
12K13
Prevent human contact
falling dirt
liquid drop/light splash
airborne dust/particles
wind blown dust
liquid heavy stream/splash
oil/coolant seepage
oil/coolant spray/splash
corrosive environment
temporarily submerged
prolonged submersion
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Figure 31.12
NEMA Enclosures
31.2.6 Wire and Cable Grouping
In a controls cabinet the conductors are passed through channels or bundled. When
dissimilar conductors are run side-by-side problems can arise. The basic categories of conductors
are shown in Figure 31.13. In general category 1 conductors should not be
grouped with other conductor categories. Care should be used when running category 2
and 3 conductors together.