Single Conductor Ampacity for COPPER cables in DIRECT BURIAL

Ampacity Rating and Recommended Configurations

For installation of single conductor COPPER cables IN DIRECT BURIAL

Types RWU90, RA90, TECK90, ACWU90, 0 to 5 kV

ATTENTION - Only these configurations are recommended by Nexans to obtain satisfactory load sharing and ampactiy. See C.E.C. Code Rules 4-004, 8-104, 12-012, Appendix B, Appendix Tables D8A and D8B.

Notes:

The ampacities in the tables on this page are based on the following conditions:

• 100% load factor
• Ambient soil temperature of 20^oC
• Soil resistivity of 90^oC-cm/W
• Conductor temperature of 90^oC
• Spacing between conductor centres of 190 mm and 610mm between groups
• Burial depth of 915 mm to centre of top cable layer
• Open circuit sheath/shield operation

Neutral conductors to be located outside of the above groups in the most convenient manner.

Note: 
Allowable current for 90^oC rated single copper conductors with spacings directly buried in earth, subject to Subrules 4-004(13) and (14), where 
(a) for any load, the cable terminates at equipment of any type other than a service box, fusible switch, circuit breaker, or panelboard; or 
(b) the load is non-continuous and either end of the cable terminates at a service box, fusible switch, circuit breaker, or panelboard.
2.  The ampacities provided in the Tables are the lesser of:  (a) the value obtained in accordance with Rule 4-004(1)(d): or (b) the value obtained in accordance with Rule 8-104(7).

Notes:

1. Allowable current for 90^oC rated single copper conductors with spacings directly buried in earth, subject to Subrules 4-004(13) and (14), where (a) the load is continuous, and (b) either end terminates at a service box, fusible switch, circuit breaker, or panelboard.
2. The columns with the heading "80%" denote that the equipment identified in 1(b) is not marked as certified to carry its ampere rating continuously.
3. The columns with the heading "100%" denote that the equipment identified in 1(b) is marked as certified to carry its ampere rating continuously.
4. The ampacities provided in the Table are the lesser of:  (1) the value obtained in accordance with the Rule 4-004(1)(d); or (b) the value obtained in accordance with Rule 8-104(7).