32. Appendix B - Common References

 

 

 

 

• The Joint International Committee (JIC) developed a standard set of symbols for representing electrical circuit elements. These are given below:

 

 

 

 

 

 

• NEMA has provided a set of ratings for cabinets housing voltages less than 1000V AC. The basic classifications are outlined below,

 

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