TECHNICAL GUIDELINE. Medium Voltage Conductor Ampacities ALUMINUM COPPER. Single Conductor 5kV - 35kV
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1 Medium Voltage Ampacities Single 5kV - 35kV / / / / / / / / Based on NEC Table (C)(73) Ampacities of an Insulated Triplexed or Three Single Copper Cables in Isolated Conduit in Air Based on Temperatures of (194 F) and and (221 F) and Ambient Air Temperature of 40 C (104 C)1. Based on NEC Table (C)(74) Ampacities of an Insulated Triplexed or Three Single Aluminum Cables in Isolated Conduit in Air Based on Temperatures of (194 F) and and (221 F) and Ambient Air Temperature of 40 C (104 C)1. Page 1 of 6
2 Medium Voltage Ampacities Single 5kV - 35kV / / / / / / / / Based on NEC Table (C)(67) Ampacities of Insulated Single Copper Cables Triplexed in Air Based on Temperatures of (194 F) and (221 F) and Ambient Air Temperature of 40 C (104 F)1. Based on NEC Table (C)(68) Ampacities of an Insulated Single Aluminum Cables Triplexed in Air Based on Temperatures of (194 F) and (221 F) and Ambient Air Temperature of 40 C (104 F)1. Page 2 of 6
3 Medium Voltage Ampacities Multiconductor 5kV - 35kV / / / / / / / / Based on NEC Table (C)(79) Ampacities of Three Insulated Copper s Cabled Within an Overall Covering (Three- Cable) in Underground Electrical Ducts (One Cable per Electrical Duct) Based on Ambient Earth Temperature of 20 C (68 F), Electrical Duct Arrangement in Accordance with Figure , 100 Percent Load Factor, Thermal Resistance (RHO) of 90, Temperatures of (194 F) and (221 F). One Circuit (See Figure , Detail 1.)1. Based on NEC Table (C)(80) Ampacities of Three Insulated Aluminum s Cabled Within an Overall Covering (Three- Cable) in Underground Electrical Ducts (One Cable per Electrical Duct) Based on Ambient Earth Temperature of 20 C (68 F), Electrical Duct Arrangement in Accordance with Figure , 100 Percent Load Factor, Thermal Resistance (RHO) of 90, Temperatures of (194 F) and (221 F). One Circuit (See Figure , Detail 1.)1. Page 3 of 6
4 Medium Voltage Ampacities Multiconductor 5kV - 35kV / / / / / / / / Based on NEC Table (C)(83) Ampacities of Three Insulated Copper s Cabled Within an Overall Covering (Three- Cable) Directly Buried in Earth Based on Ambient Earth Temperature of 20 C (68 F), Arrangement per Figure , 100 Percent Load Factor, Thermal Resistance (RHO) of 90, Temperatures of (194 F) and (221 F). One Circuit (See Figure , Detail 5.)1 Based on NEC Table (C)(84) Ampacities of Three Insulated Aluminum s Cabled Within an Overall Covering (Three- Cable) Directly Buried in Earth Based on Ambient Earth Temperature of 20 C (68 F), Arrangement per Figure , 100 Percent Load Factor, Thermal Resistance (RHO) of 90, Temperatures of (194 F) and (221 F). One Circuit (See Figure , Detail 5.)1 Page 4 of 6
5 Ambient Temperature Correction Factors Temperature Rating of the Ambient Temperature ( C) Ambient Temperature ( F) 10 or less or less Based on NEC Table (C)(4). For ambient temperatures other than 40 C (104 F), multiply the allowable ampacities specified in the ampacity tables by the appropriate factor shown above.1 Page 5 of 6
6 Medium Voltage Cables ( and MV UD) Voltage Ratings Voltage Rating Insulation Level Nominal Thickness (mils) 5kV 100% 90 5kV 133% 115 8kV 100% 115 8kV 133% kV 100% kV 133% kV 100% kV 100% kV 133% kV 133% kV 100% kV 133% 420 Voltage and insulation level, per UL 1072, ICEA S and ICEA S , section 4, table 4-7. Minimum (AWG) Voltage Rating Minimum (AWG) 5kV 8 8kV 6 15kV 2 25kV 1 35kV 1/0 Page 6 of 6
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