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SWITCHGEAR BIG GRAY BOXES SWITCHBOARD

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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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Presentation Transcript
slide7

Comparison (cont.)

Switchgear has Defined Short Time Withstand Ratings!

slide8

“Practice” Comparison

Switchgear maintenance permitted (not required by standard).

Switchboard maintenance often not allowed.

old vs new
Old Vs New

Insulated Case UL 1066 IRON FRAME ANSI

advantages of insulated case vs iron frame
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)
mechanical construction
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
organic vs iron frame
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
display type
Display type

A

P

H

LCD ammeter

LED Bargraph

LCD

All functions

LCD

All functions

switchboards
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
hybred ul 891 switchboards
“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
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