UFC 3 -520-01
June 10, 2002
FIGURES
Figure
Title
2-1
Computer Model of Electrical System ............................................................
2-4
2-2
Completely Symmetric or Asymmetric Current ............................................
2-7
2-3
Typical Asymmetrical Short Circuit Behavior................................................
2-7
3-1
Single Power Feed to Facility..........................................................................
3-3
3-2
Redundant Power Feed to Facility .................................................................
3-4
4-1
Insulation System Ratings ...............................................................................
4-3
4-2
Spacing Requirements for Transforme rs Rated 112.5 kVA or Less .........
4-11
4-3
Spacing Requirements for Transfo rmers Rated Over 112.5 kVA .............
4-11
4-4
Installation Requirements for Transformers Rated Over 35,000 Volts .....
4-12
8-1
Equipment Positioning to Allow Escape Around Equipment......................
8-1
8-2
Associated Equipment Maximum Extension into Work Space ..................
8-3
8-3
Dedicated Clear Space Above Equipment ....................................................
8-4
9-1
Selective Coordination Example .....................................................................
9-7
9-2
Selective Coordination Example with Fuses ................................................
9-8
9-3
Simplified Solid-State Trip Unit .......................................................................
9-16
10-1
Purpose of Static Grounding ...........................................................................
10-2
11-1
Simplified Facility Layout .................................................................................
11-3
11-2
Optimal Installation of Surge Protector Leads First Example .................
11-4
11-3
Optimal Installation of Surge Protector Leads Second Example ...........
11-5
11-4
Unacceptable Installation with Long Surge Protector Leads .....................
11-6
11-5
Less-Than-Optimal Installation by Including Safety Switch .......................
11-6
12-1
Typical Derating Factor for Three-Phase Induction Motors .......................
12-2
12-2
Effect of Single Phase Nonlinear Loads on Neutral Currents ....................
12-10
13-1
Open Transition Transfer .................................................................................
13-14
13-2
Closed Transition Transfer ..............................................................................
13-15
13-3
Induction Motor Open Circuit Voltage Decay ...............................................
13-21
14-1
Battery Room Clearances ................................................................................
14-3
14-2
Two -Step Battery Rack Configuration (End View) .......................................
14-4
14-3
Larger Battery Rack Configurations (End View) ..........................................
14-5
B-1
Sample Short Circuit Results--1 MVA Transformer ...................................
B-1
B-2
Sample Short Circuit Results--2 MVA Transformer ...................................
B-2
B-3
Overduty Molded Case Circuit Breakers .......................................................
B-3
B-4
Adjustable Speed Drive Economic Evaluation .............................................
B-10
B-5
Typical Motor Load Profile With Motor Operating at Half of Rated Load .
B-11
B-6
Lead Length Effect on Let-Through Voltage .................................................
B-13
C-1
Capacitor Installation for Power Factor Correction......................................
C-1
C-2
Phasor Diagram for Power Factor Correction ..............................................
C-2
D-1
UL 1449 Listed Surge Protector .....................................................................
D-2
D-2
Unlisted Surge Protector ..................................................................................
D-2
D-3
Example of Internally Fused Surge Protector ...............................................
D-7
D-4
Excessive Lead Length Caused by Over-Sized Enclosure ........................
D-8
E-1
Generalized Duty Cycle ...................................................................................
E-2
F-1
Lighting Plan Showing Phase Rotated HID Luminaires .............................
F-4
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