Sharing our Guidance
Electrical Equipment Enclosure Types
X
Electrical Equipment Enclosure Types
08/01/13 2
NEC Article 110.28
Enclosures (other than surrounding fences or walls) o...
X
Electrical Equipment Enclosure Types
08/01/13 3
Outline
• Hazardous Location Classes
• Hazardous Location Groups
• Hazar...
X
Electrical Equipment Enclosure Types
• Class 1
• Presence of flammable gas or vapors
• Potential for explosion
• Include...
X
Electrical Equipment Enclosure Types
• Class 1
• Group A: Acetylene
• Group B: Hydrogen, etc.
• Group C: Hydrocarbons, f...
X
Electrical Equipment Enclosure Types
• Division 1 – Normal Conditions
• Ignitable concentrations of hazards exist under ...
X
Electrical Equipment Enclosure Types
08/01/13 7
Non-Hazardous Location Enclosures
X
Electrical Equipment Enclosure Types
08/01/13 8
X
Electrical Equipment Enclosure Types
• #R = Protection against falling dirt only - not windblown dust
• #X = Protection ...
X
Electrical Equipment Enclosure Types
• Type 7: Constructed for indoor use in hazardous locations classified as Class 1,
...
X
Electrical Equipment Enclosure Types
NEMA 1 Enclosure
08/01/13 11
• Indoor use
• Protects against:
1. Incidental contact...
X
Electrical Equipment Enclosure Types
NEMA 3R Enclosure
08/01/13 12
• Outdoor use
• Protects against:
1. Incidental conta...
X
Electrical Equipment Enclosure Types
NEMA 4X Enclosure
08/01/13 13
• Indoor use
• Protects against:
1. Incidental contac...
X
Electrical Equipment Enclosure Types
NEMA 6P Enclosure
08/01/13 14
• Indoor use
• Protects against:
1. Incidental contac...
X
Electrical Equipment Enclosure Types
NEMA 7 Enclosure
08/01/13 15
• Indoor use
• Use in areas classified as Class 1,
Div...
X
Electrical Equipment Enclosure Types
NEMA 12 Enclosure
08/01/13 16
• Indoor use
• Constructed without knockouts
• Protec...
Electrical Equipment Enclosure Types
CONCLUSION
THANK YOU.
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120420 enclosure types

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120420 enclosure types

  1. 1. Sharing our Guidance Electrical Equipment Enclosure Types
  2. 2. X Electrical Equipment Enclosure Types 08/01/13 2 NEC Article 110.28 Enclosures (other than surrounding fences or walls) of switchboards, panelboards, industrial control panels, motor control centers, meter sockets, enclosed switches, transfer switches, power outlets, circuit breakers, adjustable-speed drive systems, pullout switches, portable power distribution equipment, termination boxes, general-purpose transformers, fire pump controllers, fire pump motors, and motor controllers, rated not over 600 volts nominal and intended for such locations, shall be marked with an enclosure-type number as shown in Table 110.28.
  3. 3. X Electrical Equipment Enclosure Types 08/01/13 3 Outline • Hazardous Location Classes • Hazardous Location Groups • Hazardous Location Divisions • Enclosure Types • Non-Hazardous Locations • Hazardous Locations • Enclosure Examples
  4. 4. X Electrical Equipment Enclosure Types • Class 1 • Presence of flammable gas or vapors • Potential for explosion • Includes: petroleum refineries, aircraft hangers, dry cleaning plants • Class 2 • Presence of combustible dust • Potential for explosion • Includes: grain elevators, flour/feed mills, spice grinding plants • Class 3 • Presence of easily-ignitable fibers • Potential for ignition of fibers • Includes: textile mills, flax processing plants, any plant creating sawdust Hazardous Location Classes 08/01/13 4
  5. 5. X Electrical Equipment Enclosure Types • Class 1 • Group A: Acetylene • Group B: Hydrogen, etc. • Group C: Hydrocarbons, fuels, solvents, etc. • Class 2 • Group E: Metal dusts (conductive & explosive) • Group F: Carbon dusts (all explosive, some conductive) • Group G: Flour, starch, grain, combustible plastic, chemical dust (explosive) • Class 3 • Textiles, woodworking, etc. (easily ignitable, not likely explosive) Hazardous Location Groups 08/01/13 5
  6. 6. X Electrical Equipment Enclosure Types • Division 1 – Normal Conditions • Ignitable concentrations of hazards exist under normal operation • Ignition of hazard is caused by frequent maintenance, repair work, or equipment failure • Division 2 – Abnormal Conditions • Ignitable concentrations of hazards are handled, process, or used • These hazards are normally in closed containers or systems • Hazards can only escape through accidental rupture or breakdown of their containers or systems Hazardous Location Divisions 08/01/13 6
  7. 7. X Electrical Equipment Enclosure Types 08/01/13 7 Non-Hazardous Location Enclosures
  8. 8. X Electrical Equipment Enclosure Types 08/01/13 8
  9. 9. X Electrical Equipment Enclosure Types • #R = Protection against falling dirt only - not windblown dust • #X = Protection against corrosion • #S = Protection against sleet – able to operate when covered in ice • #K = Constructed with knockouts • #P = Protection against corrosion and prolonged submersion Enclosure Letter Designations 08/01/13 9
  10. 10. X Electrical Equipment Enclosure Types • Type 7: Constructed for indoor use in hazardous locations classified as Class 1, Division 1, Group A, B, C, or D as defined in NFPA 70. • Type 8: Constructed for indoor/outdoor use in hazardous locations classified as Class 1, Division 1, Groups A, B, C, or D as defined in NFPA 70. • Type 9: Constructed for indoor use in hazardous locations classified as Class 2, Division 1, Groups E, F, or G as defined in NFPA 70. • Type 10: Constructed to meet the requirements of the Mine Safety and Health Administration, 30 CFR, Part 18 (use in mines with atmospheres containing methane or natural gas, with or without coal dust). Hazardous Location Enclosures 08/01/13 10
  11. 11. X Electrical Equipment Enclosure Types NEMA 1 Enclosure 08/01/13 11 • Indoor use • Protects against: 1. Incidental contact with enclosed equipment 2. Falling dirt
  12. 12. X Electrical Equipment Enclosure Types NEMA 3R Enclosure 08/01/13 12 • Outdoor use • Protects against: 1. Incidental contact with enclosed equipment 2. Rain, snow, sleet
  13. 13. X Electrical Equipment Enclosure Types NEMA 4X Enclosure 08/01/13 13 • Indoor use • Protects against: 1. Incidental contact with enclosed equipment 2. Falling dirt 3. Falling liquids and light splashing 4. Circulating dust, lint, fibers 5. Settling dust, lint, fibers 6. Corrosive agents
  14. 14. X Electrical Equipment Enclosure Types NEMA 6P Enclosure 08/01/13 14 • Indoor use • Protects against: 1. Incidental contact with enclosed equipment 2. Falling dirt 3. Falling liquids and light splashing 4. Circulating dust, lint, fibers 5. Settling dust, lint, fibers 6. Corrosive agents 7. Occasional prolonged submersion
  15. 15. X Electrical Equipment Enclosure Types NEMA 7 Enclosure 08/01/13 15 • Indoor use • Use in areas classified as Class 1, Division 1, Groups A, B, C, D • Designed to contain an internal explosion without causing external hazard
  16. 16. X Electrical Equipment Enclosure Types NEMA 12 Enclosure 08/01/13 16 • Indoor use • Constructed without knockouts • Protects against: 1. Falling dirt 2. Circulating dust, lint, fibers 3. Dripping/splashing water
  17. 17. Electrical Equipment Enclosure Types CONCLUSION THANK YOU.

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