LV Cable Data

From Open Electrical

These pages provide reference data for low voltage 0.6/1 kV cables. The data should be used as a rough guide in the absence of more specific information.

All data are according to the IEC 60364-5-52:2009, BS 7671:2008, NF C 15-100:2002 and AS/NZS 3008.1.1:2009.

Contents 1 IEC 60364-5-52 1.1 Cable Installation Arrangements 1.2 Current Carrying Capacity 1.3 Derating Factors 2 NF C 15-100 2.1 Current Carrying Capacity 2.2 Derating Factors 3 BS 7671 3.1 Current Carrying Capacity 3.2 Derating Factors 4 AS/NZS 3008.1 4.1 Current Carrying Capacity 4.2 Derating Factors 4.3 Cable Impedances (According to the AS/NZS 3008.1.)

IEC 60364-5-52

Cable Installation Arrangements

Cable Reference Installation Methods

Current Carrying Capacity

• Copper Conductors

• PVC Current Ratings (Copper)
• EPR or XLPE Current Ratings (Copper)

• Aluminium Conductors

• PVC Current Ratings (Aluminium)
• EPR or XLPE Current Ratings (Aluminium)

Derating Factors

• Above Ground:

• Ambient Temperature Derating Factors
• Grouping Derating Factors (Single Layer)
• Grouping Derating Factors (Multiple Layers)

• Below Ground:

• Soil Temperature Derating Factors
• Soil Thermal Resistivity Derating Factors
• Grouping Derating Factors - Buried Direct
• Grouping Derating Factors - Buried in Conduit

NF C 15-100

Current Carrying Capacity

• Tableau 52H - Courants admissibles (en ampères) dans les canalisations pour les méthodes de référence B, C, E et F
• Table 52H - Cable current carrying capacity (in amperes) for the reference methods B, C, E and F
• Tableau 52J - Courants admissibles (en ampères) dans les canalisations enterrées(méthode de référence D)
• Table 52J - Cable current carrying capacity (in amperes) for the reference method D

Derating Factors

Temperature correction factors:

• Tableau 52K - Facteurs de correction pour des températures ambiantes différentes de 30 °C
• Table 52K - Derating factors for ambient temperatures other than 30 °C
• Tableau 52L - Facteurs de correction pour des températures du sol différentes de 20 °C
• Table 52L - Derating factors for ground temperatures other than 20 °C

Soil derating factors:

• Tableau 52M - Facteurs de correction pour les câbles enterrés en fonction de la résistivité thermique du sol
• Table 52M - Derating factors for buried wiring systems, in relation to the soil thermal resistivity

Grouping derating factors:

• Tableau 52N - Facteurs de correction pour groupement de plusieurs circuits ou de plusieurs câbles multiconducteurs
• Table 52N - Derating factors for a group of several multi-core cables or groups of single-core cables: touching
• Tableau 52O - Facteurs de correction pour pose en plusieurs couches pour les références 1 à 5 du tableau 52N
• Table 52O - Derating factors for a group of several multi-core cables or groups of single-core cables: arranged in layers
• Tableau 52P - Facteurs de correction en fonction du nombre de conduits dans l'air et de leur disposition
• Table 52P - Derating factors in relation to the number of conduits in air and their arrangement
• Tableau 52Q - Facteurs de correction en fonction du nombre de conduits noyés dans le béton et de leur disposition
• Table 52Q - Derating factors in relation to the number of conduits buried or built into concrete and their arrangement
• Tableau 52R - Facteurs de correction pour groupement de plusieurs câbles posés directement dans le sol. Câbles monoconducteurs ou multiconducteurs disposés horizontalement ou verticalement
• Table 52R - Derating factors for a group of several cables installed directly in the ground: single- or multi-core cables arranged horizontally or vertically
• Tableau 52S - Facteurs de correction pour conduits enterrés disposés horizontalement ou verticalement à raison d'un câble ou d'un groupement de 3 câbles monoconducteurs par conduit
• Table 52S - Derating factors for non-touching buried conduits run horizontally or vertically on the basis of one cable or group of 3 single-core cables per conduit
• Tableau 52T - Facteurs de correction dans le cas de plusieurs circuits ou câbles dans un même conduit enterré
• Table 52S - Derating factors in the case of several circuits or cables in the same buried conduit

BS 7671

Current Carrying Capacity

• Current Carrying Capacities for all installation methods

Derating Factors

Temperature derating factors:

• Ambient Temperature Derating Factors
• Soil Temperature Derating Factors

Soil derating factors:

• Soil Thermal Resistivity Derating Factors
• Depth of Laying Derating Factors

Grouping derating factors:

• Grouping in Air Derating Factors
• Grouping in Ground Derating Factors

AS/NZS 3008.1

Current Carrying Capacity

Derating Factors

Temperature derating factors:

• Air Temperature Derating Factors
• Ground Temperature Derating Factors

Grouping derating factors:

• Derating factor for bunched circuits
• Derating factor for single-core, method F
• Derating factor for multi-core, method E
• Derating factor for single-core direct buried, method D
• Derating factor for multi-core direct buried, method D
• Derating factor for single-core buried in duct, method D
• Derating factor for multi-core buried in duct, method D

Depth of laying derating factor:

• Derating factor for direct buried, method D
• Derating factor for buried in duct, method D

Soil thermal resistivity derating factor:

• Derating factor for thermal resistivity, method D

Cable Impedances (According to the AS/NZS 3008.1.)

• AC Reactance of insulated conductors operating at 50Hz
• AC Resistance of insulated conductors operating at 50Hz
• DC Resistance of copper and aluminium conductors at 20^oC (AS/NZS 1125.1)

Refer also to the Cable Impedance Calculations article, which provides details on how the cable impedances are determnined.