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ANSI/NEMA CC 1-2018 (R2023) Electric Power Connection for Substations, 2018
- Foreword
- Section 1 General [Go to Page]
- 1.1 Scope
- 1.2 References
- 1.3 Definitions
- Section 2 Performance Requirements [Go to Page]
- 2.1 Current Ratings for Connectors Designed to Be Used on Copper Conductor [Go to Page]
- 2.1.1 The 60-Hz current ratings of copper conductors are shown in Annex B, Section B.1.1.
- 2.1.2 The current rating of the connector may be based upon either the conductor sizes from tables B-1 or B-2 or the current rating of the equipment to which the connector is attached if it is specifically designed to connect to one piece o...
- 2.2 Current Ratings for Connectors Designed to Be Used on Aluminum Conductor [Go to Page]
- 2.2.1 The 60-Hz current ratings of aluminum conductors or aluminum pipe conductors are shown in Annex B, Section B.2.
- 2.2.2 The current rating of the connector may be based upon either the conductor sizes from tables B-3 or B-4 or the current rating of the equipment to which the connector is attached if it is specifically designed to connect to one piece o...
- 2.3 Connector Classes [Go to Page]
- 2.3.1 HV (high voltage)—equal to or greater than 100 kV and equal to or less than 230 kV.
- 2.3.2 EHV (extra high voltage)—greater than 230 kV but less than 1000 kV.
- 2.3.3 UHV (ultra high voltage)—equal to or greater than 1000 kV.
- 2.4 EHV and UHV Power Connectors [Go to Page]
- 2.4.1 Test Phase Spacings
- 2.4.2 Installation Phase Spacings
- 2.5 Frequency
- 2.6 Temperature Rise (See 3.1) [Go to Page]
- 2.6.1 Temperature Rise of the Connector
- 2.6.2 Average Temperature of an Expansion Electric Power Connector
- 2.7 Pullout Strength (See 3.2.)
- 2.8 Cantilever Strength of Bus Supports (See 3.4)
- 2.9 Torque Strength of Bolted Connectors
- 2.10 Aluminum Weldment Couplers
- Section 3 Test Methods [Go to Page]
- 3.1 Temperature Rise Tests [Go to Page]
- 3.1.1 Temperature Rise Tests
- 3.1.2 Test Loop Preparation
- 3.1.3 Current Values to Be Used in the Temperature Rise Tests [Go to Page]
- 3.1.3.1 Rated Conductor Current
- 3.1.3.2 Test Current Determination [Go to Page]
- 3.1.3.2.1 Terminal Connectors
- The current test shall be performed at either the current rating of the equipment to which the connector is joined or the current rating of the conductor, whichever is lower.
- 3.1.3.2.2 Angle and Straight Connectors
- The test current shall be based upon:
- 3.1.3.2.3 "T" Connectors
- The test current shall be based upon:
- 3.1.4 Expansion Connector Measurements
- 3.2 Pullout Strength Tests
- 3.3 Corona and RIV Tests [Go to Page]
- 3.3.1 Test Setup
- 3.3.2 Tests Performed under Single-Phase Conditions
- 3.3.3 Observations for Visual Corona
- 3.3.4 RIV Measurements [Go to Page]
- 3.3.4.1 NEMA 107 Methods of Measurement of Radio Influence Voltage (RIV) of High Voltage Apparatus
- or
- 3.3.4.2 IEC 61284 Overhead Lines—Requirements and tests for fittings, Section 15 Corona and radio interference voltage (RIV) tests
- 3.4 Cantilever Strength of Bus Supports
- 3.5 Torque Strength Test of Bolted-Type Connectors
- 3.6 Tensile Test of Welded Couplers
- 3.7 Bending Test of Welded Couplers
- Section 4 Design Requirements [Go to Page]
- 4.1 Clamping Fasteners for Connectors [Go to Page]
- 4.1.1 Clamping Fasteners for Copper Electric Power Connectors
- 4.1.2 Clamping Fasteners for Aluminum Electric Power Connectors [Go to Page]
- 4.1.2.1 Clamping fasteners for aluminum electric power connectors shall meet the requirements of the American National Standard for Hex Bolts and Screws, ASME B18.21.1, and Square and Hex Nuts, ASME B18.2.2. Flat washers shall meet the requirements of...
- 4.1.2.2 Bolts, nuts, or both, shall be lubricated to prevent galling.
- 4.2 Thread Dimensions for Stud Terminal Connectors
- 4.3 Bolt Holes for Terminal Connectors with Single Tangs or Multiple Flat Bar Tangs [Go to Page]
- 4.3.1 The dimensions and the arrangement of bolt holes in the tangs of power connectors used in North America shall be as shown in Annex C, Figures C-1 to C-6. Figures C-7 to C-9 show the typical spacing for multiple flat bar tangs.
- 4.3.2 Metric terminal pad spacing and sizes used in some countries other than the U.S. are given for information in Annex D.
- 4.4 Conductor Clamping Bolts for Connectors [Go to Page]
- 4.4.1 General
- 4.4.2 Number and Diameter of Conductor Clamping Bolts [Go to Page]
- 4.4.2.1 U-Bolts (See Figure 4-1)
- 4.4.2.2 Shackles (See Figure 4-2)
- 4.4.2.3 Different Sizes of Conductors
- 4.4.2.4 Exception when Three Bolts are Specified
- 4.4.3 Examples Illustrating the Use of Table 4-2 [Go to Page]
- 4.4.3.1 Example 1
- 4.4.3.2 Example 2
- 4.4.3.3 Example 3
- 4.5 Tensile Strength of Bolts
- 4.6 Expansion Connectors
- 4.7 Terminal Connectors
- 4.8 Flat Plain Washers
- Section 5 Recommendation for Making Connections [Go to Page]
- 5.1 Surface Preparation
- 5.2 Aluminum-to-Copper Connections
- 5.3 Silver-Plated Aluminum Connectors
- 5.4 Welded Connections
- It is recommended that a welder qualified for the material perform the welding. Prior to welding, it is recommended that a test weld is made on a typical aluminum casting (see 2.10).
- 5.5 Tongue Mounting Fasteners
- Section 6 Marking Requirements [Go to Page]
- 6.1 Identification Marking
- 6.2 Marking of Connector Sizes [Go to Page]
- 6.2.1 For Wire and Cable Conductors [Go to Page]
- 6.2.1.1 American Wire Gauge (AWG) or thousands of circular mils (kcmil). Reference is also made to the equivalent metric (mm2) sizes for AWG or kcmil series conductors.
- 6.2.1.2 Metric or mm2 sizes
- 6.2.2 For Tubing [Go to Page]
- 6.2.2.1 Nominal Pipe Size (NPS) or Iron Pipe Size (IPS), which includes standard (SPS or SCH 40) and extra heavy (EHPS or SCH 80) sizes, except for expansion or internal connectors. The connector marked NPS or IPS indicates that it is designed to acco...
- 6.2.2.2 In nominal metric pipe size.
- Annex B (Informational) Conductor Current Ratings [Go to Page]
- B.1 Current Ratings for Bare Copper Conductors and Tubing [Go to Page]
- B.1.1 Ampacity Rating Basis for Copper Conductors
- B.2 Current Ratings for Aluminum Conductors and Pipe Conductors [Go to Page]
- B.2.1 Ampacity Rating Basis for Aluminum Conductors
- B.2.2 Current Ratings for Different Aluminum Conductivity
- Annex C (Normative) North American Dimensional Standards [Go to Page]
- C.1. Dimensional Requirements for Bolt Holes for Terminal Connectors
- C.2. Dimensional Requirements for Bus Supports and Offset Pad Connectors [Go to Page]
- C.2.1 Height of Bus Support Clamps (Fittings)
- c.2.2. Offset Pad Terminal Connectors for Tubular Bus
- Outside Diameter
- Annex D (Informational) Bolt Hole Spacings and Pad Dimensions For Other Countries
- Annex E (Informational) Common Types of Substation Connectors [Go to Page]
