ANSI/NEMA WC 51/ICEA P-54-440:2009(R2014)
Superseded
A superseded Standard is one, which is fully replaced by another Standard, which is a new edition of the same Standard.
A superseded Standard is one, which is fully replaced by another Standard, which is a new edition of the same Standard.
Hardcopy , PDF
20-04-2023
English
27-12-2019
Foreword
Scope
History
Section 1 - GENERAL INFORMATION
1.1 Background
1.2 References
1.2.1 Normative References
1.2.2 Other References
1.3 DEFINITIONS
Section 2 - TABLE DEVELOPMENT PARAMETERS
2.1 Parameters Used to Develop Tray Ampacity Tables
2.1.1 Cable Operating Temperatures
2.1.2 Allowable Heat Generation
2.1.3 Calculated Depth of Cables in Trays - Apparent
Fill Depth
2.1.4 Cable Diameters
2.1.5 Conductor Resistance
2.1.6 Calculated Free-Air Ampacity
2.1.7 Ampacity Values
Section 3 - AMPACITY ADJUSTMENT FACTORS
3.1 Correction Factor for Diameters of Cables
3.2 Correction Factor for Temperatures
3.2.1 Ambient Temperature
3.2.2 Conductor Temperature
3.3 Correction Factor for Number of Conductors
3.4 Correction Factors for Tray Covers
3.5 Correction Factors for Load Diversity
3.5.1 Determining the Loading Factor
3.5.2 Diversity Factors
Section 4 - EXAMPLES
4.1 Calculating Apparent Depth of Cable
4.2 Selecting Ampacity Values and Using Adjustment Factors
4.3 Calculating and Applying Diversity Factors
4.4 Multiple Adjustment Factors
4.5 Calculating Ampacities for Cables Not Covered by Tables
Section 5 - TABLES
5.1 Index to Tables
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