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SWITCHGEAR BIG GRAY BOXES SWITCHBOARD

SWITCHGEAR BIG GRAY BOXES SWITCHBOARD. Why Different Standards? ANSI vs UL. Standards Comparison. Standards Comparison (cont.). Comparison (cont.). Switchgear has Defined Short Time Withstand Ratings!. “Practice” Comparison. Switchgear maintenance permitted (not required by standard).

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SWITCHGEAR BIG GRAY BOXES SWITCHBOARD

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  1. SWITCHGEAR BIG GRAY BOXES SWITCHBOARD

  2. Why Different Standards? ANSI vs UL

  3. Standards Comparison

  4. Standards Comparison (cont.)

  5. Comparison (cont.) Switchgear has Defined Short Time Withstand Ratings!

  6. “Practice” Comparison Switchgear maintenance permitted (not required by standard). Switchboard maintenance often not allowed.

  7. Side View

  8. Rear View

  9. Insulated Case vs Molded Case Insulated Case

  10. Old Vs New Insulated Case UL 1066 IRON FRAME ANSI

  11. Insulated Case vs Molded Case Molded Case

  12. Advantages of Insulated Case Vs Iron Frame • Smaller footprint • More reliable (Modular Design with Fewer Parts) • Higher interrupting ratings • Higher withstand ratings (30 Cycles) • Reduced maintenance • Electronic Trip Units • Field Installable Trip Units • Communications • Power monitoring (2.5% Accuracy)

  13. Mechanical Construction • Breaker Frames • Small : • 800A ANSI, • 1200A UL, • 1600A IEC • Medium : • 800 to 3200A ANSI, • 800 to 3000A UL, • 800 to 4000A IEC • Large : • 4000 to 5000A ANSI, • 4000 to 6000A UL, • 4000 to 6300A IEC

  14. Organic Vs Iron Frame The thermoset material of the organic case has several advantages: • Very strong and lightweight • Provides good insulation, isolation, and dielectric • Molded to support and hold internal parts with no adjustments • Fewer parts reduces complexity of assembly and maintenance

  15. Organic Vs Iron Frame

  16. Display type A P H LCD ammeter LED Bargraph LCD All functions LCD All functions

  17. UL 891 Switchboards

  18. Switchboards

  19. Switchboards • Typical Switchboard Ratings • 5000 A Mains and Bus • 1200 A and smaller group mounted • Greater than 1200A Individally mounted Fixed or Drawout • Front Connected • UL 891 Gear • UL 489 Breakers

  20. “Hybred UL 891 Switchboards” • Mix Insulated Case and Molded Case • Individially mounted • Front Connected • Rear Connected • Individually mounted • Drawout • Fixed • Group Mounted and Drawout • Fusible and Circuit Breaker • No requirement for isolation or • Barriers

  21. SWITCHGEAR BIG GRAY BOXES SWITCHBOARD

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